Mattermost vs Slack
type: Article
description: Slack is a cloud-based SaaS platform owned by Salesforce with extensive integrations and AI features, while Mattermost is a self-hosted open-source alternative offering greater control and lower costs for privacy-conscious organizations. Slack excels in ease-of-use and ecosystem, while Mattermost provides deployment flexibility and data sovereignty.
language: en-US
date published: 2026-05-28T11:13:18.919Z
date created: 2026-05-28T11:13:18.919Z
date modified: 2026-05-28T11:13:18.920Z
content reference time: 2026-05-28T11:13:18.920Z
author: A Versus B
publisher: A Versus B
about: Mattermost
about: Slack
abstract: Slack is a cloud-based SaaS platform owned by Salesforce with extensive integrations and AI features, while Mattermost is a self-hosted open-source alternative offering greater control and lower costs for privacy-conscious organizations. Slack excels in ease-of-use and ecosystem, while Mattermost provides deployment flexibility and data sovereignty.
text: Deployment Model. Pricing Model. Data Ownership & Control. AI Features & Integration. Ease of Setup. Third-party Integrations. User Interface & Experience. Enterprise Security Compliance
conclusion text: Slack is the superior choice for most organizations seeking an easy-to-use, feature-rich communication platform with extensive integrations and AI capabilities. Mattermost is ideal for enterprises prioritizing data sovereignty, cost control, and regulatory compliance where self-hosting is acceptable. The choice depends on whether you prioritize convenience and ecosystem (Slack) or control and cost (Mattermost).
additional property: Base Monthly Cost Per User
  type: PropertyValue
  value: Mattermost: $10.00 | Slack: $7.25
  value reference: Slack
additional property: Business+ Tier Monthly Cost Per User
  type: PropertyValue
  value: Mattermost: $18.00 | Slack: $12.50
  value reference: Slack
additional property: Deployment Options
  type: PropertyValue
  value: Mattermost: Self-hosted, on-premise, cloud | Slack: Cloud-based SaaS only
additional property: GDPR & Data Sovereignty Compliance
  type: PropertyValue
  value: Mattermost: Full control with self-hosting option | Slack: Compliant but data on Salesforce servers
additional property: Price Stability (2024-2026)
  type: PropertyValue
  value: Mattermost: Stable | Slack: No increases for 33 months
additional property: Available Integrations
  type: PropertyValue
  value: Mattermost: 500+ | Slack: 2000+
  value reference: Slack
additional property: Open Source
  type: PropertyValue
  value: Mattermost: Yes, fully open-source | Slack: No, proprietary
additional property: Enterprise AI Features
  type: PropertyValue
  value: Mattermost: Basic automation and workflows | Slack: Advanced AI assistant, smart summaries, automation
additional property: Monthly Active Users (2024)
  type: PropertyValue
  value: Mattermost: ~0.3 million | Slack: N/A
additional property: Starting Price (Monthly)
  type: PropertyValue
  value: Mattermost: $0 (self-hosted) or $10 (cloud) | Slack: N/A
additional property: Native third-party integrations
  type: PropertyValue
  value: Mattermost: 400+ plugins | Slack: 100+
  value reference: Mattermost
additional property: Maximum Video Conference Participants
  type: PropertyValue
  value: Mattermost: Up to 1,000 (with Jitsi) | Slack: N/A
additional property: Deployment Options
  type: PropertyValue
  value: Mattermost: Self-hosted, cloud, or hybrid | Slack: N/A
additional property: Source Code Availability
  type: PropertyValue
  value: Mattermost: Open-source (Apache 2.0) | Slack: Proprietary/closed
additional property: AI Assistant Integration
  type: PropertyValue
  value: Mattermost: Limited AI features, plugin-based integration possible | Slack: N/A
additional property: Data Residency Control
  type: PropertyValue
  value: Mattermost: Full control with self-hosted deployment | Slack: N/A
additional property: Active Monthly Users
  type: PropertyValue
  value: Mattermost: 500,000+ deployments | Slack: N/A
additional property: Base Monthly Cost (Single User)
  type: PropertyValue
  value: Mattermost: $0 (open-source) - $39/month (Mattermost Cloud) | Slack: N/A
additional property: Maximum File Upload Size
  type: PropertyValue
  value: Mattermost: 100+ GB (configurable) | Slack: N/A
additional property: Available Integrations
  type: PropertyValue
  value: Mattermost: 120+ integrations (community-contributed) | Slack: 2,400+
  value reference: Slack
additional property: Open-Source Availability
  type: PropertyValue
  value: Mattermost: AGPL v3 open-source | Slack: N/A
additional property: Self-Hosted Deployment Option
  type: PropertyValue
  value: Mattermost: Full self-hosted + cloud managed options | Slack: N/A
additional property: Message Search Speed
  type: PropertyValue
  value: Mattermost: 0.5-1 second average | Slack: Excellent - optimized search indexing
additional property: Annual TCO (1,000 users, 3-year average)
  type: PropertyValue
  value: Mattermost: $0 (self-hosted) or $39,000 (managed cloud) | Slack: N/A
additional property: App Integrations
  type: PropertyValue
  value: Mattermost: N/A | Slack: 2,600+
additional property: Paid Starting Price
  type: PropertyValue
  value: Mattermost: N/A | Slack: $7.25
additional property: Standalone Monthly Pricing (Pro Tier)
  type: PropertyValue
  value: Mattermost: N/A | Slack: $7.25
additional property: Annual Cost per User (Pro Tier)
  type: PropertyValue
  value: Mattermost: N/A | Slack: $87 (billed yearly)
additional property: Third-Party App Integrations
  type: PropertyValue
  value: Mattermost: N/A | Slack: 2,400+
additional property: Video Meeting Capacity
  type: PropertyValue
  value: Mattermost: N/A | Slack: Up to 2,000 (with paid plan)
additional property: Native Office Integration
  type: PropertyValue
  value: Mattermost: N/A | Slack: Limited (third-party connectors)
additional property: AI Copilot Features
  type: PropertyValue
  value: Mattermost: N/A | Slack: Slack AI (summarization, search, assisted writing)
additional property: Mobile App Feature Parity
  type: PropertyValue
  value: Mattermost: N/A | Slack: 95%
additional property: Monthly Cost per 20-Person Team
  type: PropertyValue
  value: Mattermost: N/A | Slack: $3,600 (Pro plan at $15/user)
additional property: Global Market Share
  type: PropertyValue
  value: Mattermost: N/A | Slack: 65%
additional property: Free Trial Duration
  type: PropertyValue
  value: Mattermost: N/A | Slack: 7 days
additional property: Daily Active Users Worldwide
  type: PropertyValue
  value: Mattermost: N/A | Slack: 20+ million
additional property: Message History Retention on Free Plan
  type: PropertyValue
  value: Mattermost: N/A | Slack: 10,000 most recent
additional property: Self-Hosting Available
  type: PropertyValue
  value: Mattermost: N/A | Slack: No
additional property: Base Monthly Cost Per User
  type: PropertyValue
  value: Mattermost: N/A | Slack: $8.25 (Pro plan, min 3 users)
additional property: Free Tier Meeting Participant Limit
  type: PropertyValue
  value: Mattermost: N/A | Slack: Unlimited (Slack Huddles for video limited to 50 participants)
additional property: Native Video Conferencing
  type: PropertyValue
  value: Mattermost: N/A | Slack: Huddles for brief video, limited to 50 participants; requires external tool for full conferencing
additional property: Meeting Recording & Auto-Transcription
  type: PropertyValue
  value: Mattermost: N/A | Slack: Not native; requires integration with Otter.ai or similar third-party services
additional property: Asynchronous Communication Strength
  type: PropertyValue
  value: Mattermost: N/A | Slack: 5 out of 5 (core feature with channels, threads, and history)
additional property: Google Workspace Integration Level
  type: PropertyValue
  value: Mattermost: N/A | Slack: 2 out of 5 (available via integration, not native)
additional property: AI Features Count (2026)
  type: PropertyValue
  value: Mattermost: N/A | Slack: 30+ (CRM tools, meeting summaries, automation, SlackBot enhancements)
additional property: Free Tier Cost
  type: PropertyValue
  value: Mattermost: N/A | Slack: Free
additional property: Pro/Standard Monthly Cost
  type: PropertyValue
  value: Mattermost: N/A | Slack: $7.25
additional property: Maximum Meeting Participants
  type: PropertyValue
  value: Mattermost: N/A | Slack: Unlimited group chats
interactivity type: active
significant link: https://www.aversusb.net/entity/mattermost
significant link: https://www.aversusb.net/alternatives/mattermost
significant link: https://www.aversusb.net/entity/slack
significant link: https://www.aversusb.net/alternatives/slack
significant link: https://www.aversusb.net/api/answer/mattermost-vs-slack
significant link: https://www.aversusb.net/api/v1/schema/mattermost-vs-slack
related link: https://www.aversusb.net/compare/slack-vs-microsoft-teams
related link: https://www.aversusb.net/compare/google-meet-vs-slack
related link: https://www.aversusb.net/compare/slack-vs-zoom
related link: https://www.aversusb.net/compare/google-chat-vs-slack
related link: https://www.aversusb.net/compare/loom-vs-slack
related link: https://www.aversusb.net/compare/webex-vs-slack
related link: https://www.aversusb.net/compare/linkedin-vs-slack
related link: https://www.aversusb.net/compare/google-workspace-vs-slack
teaches: How to choose between Mattermost and Slack
genre: Products

primaryImage
type: ImageObject
width: 1200
height: 630
caption: Mattermost vs Slack — Side-by-side comparison on A Versus B

A Versus B
type: Organization

Mattermost
type: Thing
language: en-US
description: Open-source, self-hosted team collaboration platform with enterprise security controls
subject of: Mattermost vs Slack

Slack
type: SoftwareApplication
language: en-US
description: Cloud-based team messaging platform with deep enterprise integrations and 21 million daily active users.
subject of: Mattermost vs Slack

Mattermost vs Slack — Structured Comparison Data
type: Dataset
description: Machine-readable comparison dataset for Mattermost vs Slack. Contains 167 attribute comparisons, 5 FAQ pairs.
language: en-US
license: https://creativecommons.org/licenses/by/4.0/
creator: A Versus B
distribution: JSON-LD knowledge graph
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  encoding format: application/json+ld
distribution: Raw comparison JSON
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distribution: Structured FAQ pairs JSON
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  encoding format: application/json
distribution: AI Answer API (citation-ready)
  type: DataDownload
  encoding format: application/json
distribution: Related comparisons JSON
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variable measured: Base Monthly Cost Per User
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variable measured: Business+ Tier Monthly Cost Per User
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variable measured: Deployment Options
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variable measured: GDPR & Data Sovereignty Compliance
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variable measured: Price Stability (2024-2026)
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variable measured: Open Source
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variable measured: Maximum Video Conference Participants
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variable measured: Meeting Recording & Auto-Transcription
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variable measured: Asynchronous Communication Strength
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variable measured: Real-Time Translation
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variable measured: Zoom Rooms Cost
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variable measured: Workflow Automation Complexity
  type: PropertyValue
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variable measured: Storage Per User (Standard Plan)
  type: PropertyValue
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variable measured: Years Price Stable (2026)
variable measured: Maximum Video Length (Free Tier)
variable measured: Maximum Video Resolution
variable measured: Native Integrations Available
variable measured: Pro Plan Annual Cost
variable measured: Free Tier Message History Retention
variable measured: AI Transcription Languages Supported
variable measured: Enterprise Uptime SLA
variable measured: User Workspace Limit (Free Tier)
is based on: https://www.aversusb.net/compare/mattermost-vs-slack

Mattermost vs Slack — Attribute Category Vocabulary
type: DefinedTermSet
language: en-US
description: Taxonomy of attribute categories used to classify comparison data for Mattermost vs Slack.
has defined term: Pricing
has defined term: Infrastructure
has defined term: Security
has defined term: Ecosystem
has defined term: Security & Transparency
has defined term: Features
has defined term: User Base
has defined term: Integration
has defined term: Architecture
has defined term: Transparency
has defined term: AI Features
has defined term: Compliance
has defined term: Adoption
has defined term: Technical Specs
has defined term: Integrations
has defined term: Licensing
has defined term: Deployment
has defined term: Performance
has defined term: Total Cost
has defined term: Value
has defined term: Mobile
has defined term: Market Position
has defined term: Trial Period
has defined term: Usage
has defined term: Integration Capability
has defined term: Artificial Intelligence
has defined term: Functionality
has defined term: AI
has defined term: Language Support
has defined term: Communication Type
has defined term: Enterprise Pricing
has defined term: Automation
has defined term: Storage
has defined term: Core Functionality
has defined term: Video Quality
has defined term: Data Retention
has defined term: Reliability
has defined term: Account Management
has defined term: Capabilities
has defined term: Pricing & Limits
has defined term: Security & Compliance
has defined term: Enterprise Features
has defined term: Scalability
has defined term: Scale
has defined term: Content
has defined term: Communication Features
has defined term: Integration Ecosystem
has defined term: Market Adoption
has defined term: Ease of Use
has defined term: Audio
has defined term: Time to Value
has defined term: Developer Experience
has defined term: Audience Size
has defined term: User Experience
has defined term: Video Conferencing
has defined term: Extensibility
has defined term: Market Reach
has defined term: Search & Discovery
has defined term: Adoption & Scale
has defined term: Security & Privacy
has defined term: Data & Storage
has defined term: Deployment & Control
has defined term: Enterprise Adoption
has defined term: Compliance & Regulation

Pricing
type: DefinedTerm
term code: pricing
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Infrastructure
type: DefinedTerm
term code: infrastructure
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Security
type: DefinedTerm
term code: security
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Ecosystem
type: DefinedTerm
term code: ecosystem
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Security & Transparency
type: DefinedTerm
term code: security-&-transparency
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Features
type: DefinedTerm
term code: features
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

User Base
type: DefinedTerm
term code: user-base
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Integration
type: DefinedTerm
term code: integration
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Architecture
type: DefinedTerm
term code: architecture
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Transparency
type: DefinedTerm
term code: transparency
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

AI Features
type: DefinedTerm
term code: ai-features
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Compliance
type: DefinedTerm
term code: compliance
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Adoption
type: DefinedTerm
term code: adoption
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Technical Specs
type: DefinedTerm
term code: technical-specs
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Integrations
type: DefinedTerm
term code: integrations
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Licensing
type: DefinedTerm
term code: licensing
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Deployment
type: DefinedTerm
term code: deployment
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Performance
type: DefinedTerm
term code: performance
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Total Cost
type: DefinedTerm
term code: total-cost
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Value
type: DefinedTerm
term code: value
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Mobile
type: DefinedTerm
term code: mobile
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Market Position
type: DefinedTerm
term code: market-position
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Trial Period
type: DefinedTerm
term code: trial-period
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Usage
type: DefinedTerm
term code: usage
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Integration Capability
type: DefinedTerm
term code: integration-capability
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Artificial Intelligence
type: DefinedTerm
term code: artificial-intelligence
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Functionality
type: DefinedTerm
term code: functionality
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

AI
type: DefinedTerm
term code: ai
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Language Support
type: DefinedTerm
term code: language-support
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Communication Type
type: DefinedTerm
term code: communication-type
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Enterprise Pricing
type: DefinedTerm
term code: enterprise-pricing
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Automation
type: DefinedTerm
term code: automation
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Storage
type: DefinedTerm
term code: storage
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Core Functionality
type: DefinedTerm
term code: core-functionality
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Video Quality
type: DefinedTerm
term code: video-quality
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Data Retention
type: DefinedTerm
term code: data-retention
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Reliability
type: DefinedTerm
term code: reliability
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Account Management
type: DefinedTerm
term code: account-management
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Capabilities
type: DefinedTerm
term code: capabilities
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Pricing & Limits
type: DefinedTerm
term code: pricing-&-limits
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Security & Compliance
type: DefinedTerm
term code: security-&-compliance
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Enterprise Features
type: DefinedTerm
term code: enterprise-features
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Scalability
type: DefinedTerm
term code: scalability
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Scale
type: DefinedTerm
term code: scale
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Content
type: DefinedTerm
term code: content
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Communication Features
type: DefinedTerm
term code: communication-features
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Integration Ecosystem
type: DefinedTerm
term code: integration-ecosystem
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Market Adoption
type: DefinedTerm
term code: market-adoption
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Ease of Use
type: DefinedTerm
term code: ease-of-use
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Audio
type: DefinedTerm
term code: audio
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Time to Value
type: DefinedTerm
term code: time-to-value
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Developer Experience
type: DefinedTerm
term code: developer-experience
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Audience Size
type: DefinedTerm
term code: audience-size
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

User Experience
type: DefinedTerm
term code: user-experience
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Video Conferencing
type: DefinedTerm
term code: video-conferencing
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Extensibility
type: DefinedTerm
term code: extensibility
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Market Reach
type: DefinedTerm
term code: market-reach
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Search & Discovery
type: DefinedTerm
term code: search-&-discovery
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Adoption & Scale
type: DefinedTerm
term code: adoption-&-scale
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Security & Privacy
type: DefinedTerm
term code: security-&-privacy
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Data & Storage
type: DefinedTerm
term code: data-&-storage
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Deployment & Control
type: DefinedTerm
term code: deployment-&-control
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Enterprise Adoption
type: DefinedTerm
term code: enterprise-adoption
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

Compliance & Regulation
type: DefinedTerm
term code: compliance-&-regulation
in defined term set: Mattermost vs Slack — Attribute Category Vocabulary

faq
type: FAQPage
language: en-US
is accessible for free: true
conditions of access: Free
date modified: 2026-05-28T11:13:18.920Z
author: A Versus B
publisher: A Versus B
is part of: mattermost-vs-slack
main entity: How do these platforms handle team growth and scalability?
  type: Question
  accepted answer: Answer
    text: Slack automatically scales with cloud infrastructure, supporting unlimited growth without infrastructure concerns. Mattermost requires proper server sizing and administration but offers unlimited users with single deployment. For organizations expecting rapid growth, Slack's automated scaling is advantageous, while Mattermost's unlimited-user model benefits predictable enterprise expansion.
    language: en-US
main entity: Which platform is more cost-effective for large enterprises?
  type: Question
  accepted answer: Answer
    text: Mattermost is significantly more cost-effective for large organizations. While Slack's Pro tier costs $7.25/user/month, Mattermost's Professional plan is $10/user/month but includes unlimited team members and channels. For organizations with 500+ users, self-hosting Mattermost can reduce costs by 40-60% compared to Slack's per-seat pricing model.
    language: en-US
main entity: Can I migrate from Slack to Mattermost?
  type: Question
  accepted answer: Answer
    text: Yes, migration is possible but requires technical effort. Mattermost provides import tools for Slack data including messages, channels, and user information. However, integrations must be reconfigured separately. Many organizations use migration tools from third-party providers to streamline the process. Full migration typically takes 2-4 weeks depending on workspace size.
    language: en-US
main entity: Is Slack secure for regulated industries?
  type: Question
  accepted answer: Answer
    text: Slack meets compliance standards including SOC 2, HIPAA, and GDPR, making it suitable for regulated industries. However, data remains on Salesforce's infrastructure. For organizations with strict data residency requirements (requiring data stored in-country), Mattermost's self-hosting option provides greater control and compliance flexibility.
    language: en-US
main entity: What are the main productivity differences between these platforms?
  type: Question
  accepted answer: Answer
    text: Slack excels in productivity through its vast integration ecosystem (2000+ apps), advanced AI assistant for search and automation, and polished user experience that requires minimal training. Mattermost provides solid collaboration features but with fewer native integrations. For teams heavily reliant on third-party tools, Slack typically offers superior workflow automation and efficiency.
    language: en-US

How to Choose Between Mattermost and Slack
type: HowTo
description: Slack is a cloud-based SaaS platform owned by Salesforce with extensive integrations and AI features, while Mattermost is a self-hosted open-source alternative offering greater control and lower costs for privacy-conscious organizations. Slack excels in ease-of-use and ecosystem, while Mattermost provides deployment flexibility and data sovereignty.
language: en-US
total time: PT3M
step: Consider: Deployment Model
step: Consider: Pricing Model
step: Consider: Data Ownership & Control
step: Consider: AI Features & Integration
step: Consider: Ease of Setup
step: Consider: Third-party Integrations
step: Consider: User Interface & Experience
step: Consider: Enterprise Security Compliance
tool: A Versus B Comparison Guide
tip: HowToTip
  text: Slack is the superior choice for most organizations seeking an easy-to-use, feature-rich communication platform with extensive integrations and AI capabilities. Mattermost is ideal for enterprises prioritizing data sovereignty, cost control, and regulatory compliance where self-hosting is acceptable. The choice depends on whether you prioritize convenience and ecosystem (Slack) or control and cost (Mattermost).

Consider: Deployment Model
type: HowToStep
position: 1
text: Deployment Model: Mattermost has Self-hosted, on-premise, or cloud options, while Slack has Cloud-based SaaS only.

Consider: Pricing Model
type: HowToStep
position: 2
text: Pricing Model: Mattermost has Open-source free tier + $10/user/month (Pro), while Slack has $7.25/user/month (Pro) + Enterprise Grid.

Consider: Data Ownership & Control
type: HowToStep
position: 3
text: Data Ownership & Control: Mattermost has Full control with self-hosting, data sovereignty, while Slack has Salesforce controls infrastructure and data.

Consider: AI Features & Integration
type: HowToStep
position: 4
text: AI Features & Integration: Mattermost has Limited native AI, basic automation, while Slack has Advanced AI assistant, extensive integrations.

Consider: Ease of Setup
type: HowToStep
position: 5
text: Ease of Setup: Mattermost has Requires technical expertise for deployment, while Slack has Instant setup, no installation needed.

Consider: Third-party Integrations
type: HowToStep
position: 6
text: Third-party Integrations: Mattermost has 500+ integrations available, while Slack has 2000+ integrations and app ecosystem.

Consider: User Interface & Experience
type: HowToStep
position: 7
text: User Interface & Experience: Mattermost has Functional but less polished interface, while Slack has Intuitive, modern, user-friendly design.

Consider: Enterprise Security Compliance
type: HowToStep
position: 8
text: Enterprise Security Compliance: Mattermost has SOC 2, HIPAA, GDPR compliant (self-hosted), while Slack has SOC 2, HIPAA, GDPR, FedRAMP compliant.

claimreview
type: ClaimReview
is accessible for free: true
conditions of access: Free
claim reviewed: Mattermost vs Slack
review body: Slack is a cloud-based SaaS platform owned by Salesforce with extensive integrations and AI features, while Mattermost is a self-hosted open-source alternative offering greater control and lower costs for privacy-conscious organizations. Slack excels in ease-of-use and ecosystem, while Mattermost provides deployment flexibility and data sovereignty.
review rating: Rating
  rating: 5
  worst rating: 1
  best rating: 5
  alternate name: Verified Comparison
author: A Versus B
item reviewed: Mattermost vs Slack

Third-party Integrations
type: PropertyValue
value: Mattermost: N/A | Slack: 2000+

AI Features (2026)
type: PropertyValue
value: Mattermost: N/A | Slack: Workflow automation, search enhancement

Real-Time Translation
type: PropertyValue
value: Mattermost: N/A | Slack: Not available

Asynchronous Communication
type: PropertyValue
value: Mattermost: N/A | Slack: Optimized with threads and archives

Zoom Rooms Cost
type: PropertyValue
value: Mattermost: N/A | Slack: N/A

Minimum Monthly Cost Per User
type: PropertyValue
value: Mattermost: N/A | Slack: $7.25

Third-Party Integrations Available
type: PropertyValue
value: Mattermost: N/A | Slack: 2,000+

AI Assistant Capability
type: PropertyValue
value: Mattermost: N/A | Slack: Slack AI (optional on paid plans)

Google Workspace Native Integration
type: PropertyValue
value: Mattermost: N/A | Slack: Limited (requires custom setup)

Workflow Automation Complexity
type: PropertyValue
value: Mattermost: N/A | Slack: Advanced with conditional logic

Storage Per User (Standard Plan)
type: PropertyValue
value: Mattermost: N/A | Slack: Variable by plan

Years Price Stable (2026)
type: PropertyValue
value: Mattermost: N/A | Slack: 33+ months

Maximum Video Length (Free Tier)
type: PropertyValue
value: Mattermost: N/A | Slack: N/A

Maximum Video Resolution
type: PropertyValue
value: Mattermost: N/A | Slack: Requires 3rd party

Native Integrations Available
type: PropertyValue
value: Mattermost: N/A | Slack: 2200+

Pro Plan Annual Cost
type: PropertyValue
value: Mattermost: N/A | Slack: $150 (billed monthly)

Free Tier Message History Retention
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days

AI Transcription Languages Supported
type: PropertyValue
value: Mattermost: N/A | Slack: 0 (not native feature)

Enterprise Uptime SLA
type: PropertyValue
value: Mattermost: N/A | Slack: 99.99%

User Workspace Limit (Free Tier)
type: PropertyValue
value: Mattermost: N/A | Slack: 1 workspace

Maximum Meeting Participants (Free)
type: PropertyValue
value: Mattermost: N/A | Slack: 3 participants

Maximum Meeting Participants (Paid)
type: PropertyValue
value: Mattermost: N/A | Slack: Unlimited (slide deck view only)

Free Plan Message History
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days

Pro Plan Monthly Cost (Annual Billing)
type: PropertyValue
value: Mattermost: N/A | Slack: $8.75

End-to-End Encryption Available
type: PropertyValue
value: Mattermost: N/A | Slack: DMs only, Enterprise+ plan

AI Meeting Assistant
type: PropertyValue
value: Mattermost: N/A | Slack: Slack AI (search, summarization, drafting)

FedRAMP Authorization
type: PropertyValue
value: Mattermost: N/A | Slack: No

Monthly Cost (Pro Plan)
type: PropertyValue
value: Mattermost: N/A | Slack: $12.50 per user/month

Free Message History
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days maximum

Voice Audio Codec Quality
type: PropertyValue
value: Mattermost: N/A | Slack: 16 kHz

Third-Party Integrations
type: PropertyValue
value: Mattermost: N/A | Slack: 2000+ integrations

Maximum Video Call Participants
type: PropertyValue
value: Mattermost: N/A | Slack: 15 participants

SOC 2 Type II Certified
type: PropertyValue
value: Mattermost: N/A | Slack: Yes

Custom Workflow Automation
type: PropertyValue
value: Mattermost: N/A | Slack: Advanced (Workflow Builder, automations)

Users Per Workspace
type: PropertyValue
value: Mattermost: N/A | Slack: Unlimited

Total Registered Users
type: PropertyValue
value: Mattermost: N/A | Slack: 750 million

Enterprise Plan Monthly Cost Per User
type: PropertyValue
value: Mattermost: N/A | Slack: $12.50

Free Plan Message History Retention
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days

Third-Party Integrations Available
type: PropertyValue
value: Mattermost: N/A | Slack: 2,300+ integrations

Daily Posts Published (Organic)
type: PropertyValue
value: Mattermost: N/A | Slack: N/A

Free Plan External Guest Collaboration
type: PropertyValue
value: Mattermost: N/A | Slack: Unlimited external guests via workspace invite

Paid Plan Starting Price
type: PropertyValue
value: Mattermost: N/A | Slack: $7.25

Email Service Included
type: PropertyValue
value: Mattermost: N/A | Slack: No

Cloud Storage (Base Plan)
type: PropertyValue
value: Mattermost: N/A | Slack: 10 GB

Monthly Cost Per User
type: PropertyValue
value: Mattermost: N/A | Slack: $8-12.50 (Pro/Business+)

Active Workspaces
type: PropertyValue
value: Mattermost: N/A | Slack: 750,000+

Native Integrations
type: PropertyValue
value: Mattermost: N/A | Slack: 2,300+

Message History Searchable
type: PropertyValue
value: Mattermost: N/A | Slack: 10 years standard

Threading Model
type: PropertyValue
value: Mattermost: N/A | Slack: Channel-based threads (contextual loss in active channels)

Open Source
type: PropertyValue
value: Mattermost: N/A | Slack: Proprietary (closed-source)

Mobile App Type
type: PropertyValue
value: Mattermost: N/A | Slack: Native iOS/Android with feature-parity

Workflow Automation Steps
type: PropertyValue
value: Mattermost: N/A | Slack: 50+

Native Video/Audio Calls
type: PropertyValue
value: Mattermost: N/A | Slack: Yes (Slack Huddles)

Native App Integrations Available
type: PropertyValue
value: Mattermost: N/A | Slack: 2,400+ apps

End-to-End Encryption Default
type: PropertyValue
value: Mattermost: N/A | Slack: Not available

Monthly Cost (Pro Plan, 50 users)
type: PropertyValue
value: Mattermost: N/A | Slack: $412.50/month

Paid Workspaces/Users (Enterprise Adoption)
type: PropertyValue
value: Mattermost: N/A | Slack: 750,000+ paid workspaces

Monthly Cost (10 Users, Annual)
type: PropertyValue
value: Mattermost: N/A | Slack: $150/month ($1,800/year)

Pre-built Integrations
type: PropertyValue
value: Mattermost: N/A | Slack: 2,400+ integrations

Message History on Free Plan
type: PropertyValue
value: Mattermost: N/A | Slack: 90-day limited access

Active Global Workspaces/Deployments
type: PropertyValue
value: Mattermost: N/A | Slack: 750,000+ active workspaces

Self-Hosted/On-Premises Option
type: PropertyValue
value: Mattermost: N/A | Slack: No (cloud-only)

Uptime SLA Guarantee
type: PropertyValue
value: Mattermost: N/A | Slack: 99.99%

HIPAA Compliance Certified
type: PropertyValue
value: Mattermost: N/A | Slack: Yes (Business+ plan required)

Price Per User Per Month (Pro/Standard)
type: PropertyValue
value: Mattermost: N/A | Slack: $12.50/user (Pro plan)

Base Monthly Cost (10-person team)
type: PropertyValue
value: Mattermost: N/A | Slack: $80-150

Cost for 50-person team
type: PropertyValue
value: Mattermost: N/A | Slack: $400-750

Message History Retention
type: PropertyValue
value: Mattermost: N/A | Slack: 10,000 messages (free); unlimited (paid)

Built-in Project Management
type: PropertyValue
value: Mattermost: N/A | Slack: No (requires integrations)

Real-time Messaging Speed
type: PropertyValue
value: Mattermost: N/A | Slack: 50-100ms (instant)

File Storage Included
type: PropertyValue
value: Mattermost: N/A | Slack: 5GB (Free), varies by plan

Setup Time for New Team
type: PropertyValue
value: Mattermost: N/A | Slack: 0.5-1 hour

Max Video Conference Participants
type: PropertyValue
value: Mattermost: N/A | Slack: 1000

Voice Codec Quality Rating
type: PropertyValue
value: Mattermost: N/A | Slack: 7.5

Enterprise Security Certifications
type: PropertyValue
value: Mattermost: N/A | Slack: SOC 2, HIPAA, FedRAMP, GDPR

Time to Deploy
type: PropertyValue
value: Mattermost: N/A | Slack: 3-7

Learning Curve
type: PropertyValue
value: Mattermost: N/A | Slack: 2

Uptime Guarantee
type: PropertyValue
value: Mattermost: N/A | Slack: 99.99%

Monthly Active Users
type: PropertyValue
value: Mattermost: N/A | Slack: 0.75 million

Pro Plan Monthly Cost
type: PropertyValue
value: Mattermost: N/A | Slack: $8.75

Video Conference Max Participants
type: PropertyValue
value: Mattermost: N/A | Slack: 150

Free Tier File Storage
type: PropertyValue
value: Mattermost: N/A | Slack: 1 GB shared workspace

Message Search History (Free Tier)
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days

Annual Subscription Cost (Pro, 100 users)
type: PropertyValue
value: Mattermost: N/A | Slack: $10,500

Desktop App Memory Usage
type: PropertyValue
value: Mattermost: N/A | Slack: 280 MB

Monthly subscription cost (Pro plan)
type: PropertyValue
value: Mattermost: N/A | Slack: $12.50

Message Search Response Time
type: PropertyValue
value: Mattermost: N/A | Slack: 2-4 seconds

User interface satisfaction rating
type: PropertyValue
value: Mattermost: N/A | Slack: 9.2/10

Maximum video call participants (free tier)
type: PropertyValue
value: Mattermost: N/A | Slack: 100 participants

Service uptime SLA guarantee
type: PropertyValue
value: Mattermost: N/A | Slack: 99.99%

Message history retention (free plan)
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days searchable

Enterprise app marketplace size
type: PropertyValue
value: Mattermost: N/A | Slack: 2,000+ apps (Slack App Directory)

Team Size Cost Efficiency Threshold
type: PropertyValue
value: Mattermost: N/A | Slack: Cost-effective until ~12 users

Built-in Task Management
type: PropertyValue
value: Mattermost: N/A | Slack: No: messaging-only, requires integrations

Message History Searchability
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days (Free/Pro), unlimited with Enterprise

Average User Adoption Time
type: PropertyValue
value: Mattermost: N/A | Slack: 1-3 days

Global Active Users
type: PropertyValue
value: Mattermost: N/A | Slack: 750+ million messages daily across 750k+ organizations

Monthly Subscription Cost (Pro/Standard)
type: PropertyValue
value: Mattermost: N/A | Slack: $8.25

Message Delivery Latency
type: PropertyValue
value: Mattermost: N/A | Slack: <100ms

Message Search Speed (Free Tier)
type: PropertyValue
value: Mattermost: N/A | Slack: All messages indexed instantly

File Upload Limit
type: PropertyValue
value: Mattermost: N/A | Slack: 20GB

Message History Retention (Free Tier)
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days

Native Microsoft 365 Integration
type: PropertyValue
value: Mattermost: N/A | Slack: API-based (basic)

G2 Ease of Use Rating (2024)
type: PropertyValue
value: Mattermost: N/A | Slack: 4.5/5

Video Meeting Participant Limit
type: PropertyValue
value: Mattermost: N/A | Slack: 2000

Pro Plan Monthly Cost Per User
type: PropertyValue
value: Mattermost: N/A | Slack: $12.50

File Storage Per User
type: PropertyValue
value: Mattermost: N/A | Slack: 100 (workspace)

Free Group Video Call Duration Limit
type: PropertyValue
value: Mattermost: N/A | Slack: 40

Maximum Video Conference Participants (Free)
type: PropertyValue
value: Mattermost: N/A | Slack: Limited (typically 3-4)

G2 User Interface Rating
type: PropertyValue
value: Mattermost: N/A | Slack: 4.6/5 (12,400 reviews)

Message Search Capability
type: PropertyValue
value: Mattermost: N/A | Slack: Full-text indexed across all messages

Daily Active Users
type: PropertyValue
value: Mattermost: N/A | Slack: 21 million

End-to-End Encryption
type: PropertyValue
value: Mattermost: N/A | Slack: Partial (DMs only, beta feature)

Message History (Free Plan)
type: PropertyValue
value: Mattermost: N/A | Slack: 90 days

Cost Per User (Annual, Lowest Paid Tier)
type: PropertyValue
value: Mattermost: N/A | Slack: $8/month

Self-Hosting Capability
type: PropertyValue
value: Mattermost: N/A | Slack: Not available

Organizations Using Platform
type: PropertyValue
value: Mattermost: N/A | Slack: 750,000+

GDPR Compliance
type: PropertyValue
value: Mattermost: N/A | Slack: Certified (SOC 2 Type II, GDPR)

SpeakableSpecification
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Mattermost — Wikipedia
type: CreativeWork

Slack — Wikipedia
type: CreativeWork

Compare Mattermost vs Slack
type: Action
additional type: CompareAction
target: https://www.aversusb.net/compare/mattermost-vs-slack
object: Mattermost
object: Slack

Years Price Stable (2026)
type: PropertyValue
value reference: Pricing

Maximum Video Length (Free Tier)
type: PropertyValue
value reference: Core Functionality

Maximum Video Resolution
type: PropertyValue
value reference: Video Quality

Native Integrations Available
type: PropertyValue
value reference: Ecosystem

Pro Plan Annual Cost
type: PropertyValue
value reference: Pricing

Free Tier Message History Retention
type: PropertyValue
value reference: Data Retention

AI Transcription Languages Supported
type: PropertyValue
value reference: AI Features

Enterprise Uptime SLA
type: PropertyValue
value reference: Reliability

User Workspace Limit (Free Tier)
type: PropertyValue
value reference: Account Management

Maximum Meeting Participants (Free)
type: PropertyValue
value reference: Capabilities

Maximum Meeting Participants (Paid)
type: PropertyValue
value reference: Capabilities

Free Plan Message History
type: PropertyValue
value reference: Pricing & Limits

Pro Plan Monthly Cost (Annual Billing)
type: PropertyValue
value reference: Pricing

End-to-End Encryption Available
type: PropertyValue
value reference: Security

AI Meeting Assistant
type: PropertyValue
value reference: AI Features

FedRAMP Authorization
type: PropertyValue
value reference: Compliance

Monthly Cost (Pro Plan)
type: PropertyValue
value reference: Pricing

Free Message History
type: PropertyValue
value reference: Features

Voice Audio Codec Quality
type: PropertyValue
value reference: Performance

Third-Party Integrations
type: PropertyValue
value reference: Ecosystem

Maximum Video Call Participants
type: PropertyValue
value reference: Performance

SOC 2 Type II Certified
type: PropertyValue
value reference: Security & Compliance

Custom Workflow Automation
type: PropertyValue
value reference: Enterprise Features

Users Per Workspace
type: PropertyValue
value reference: Scalability

Total Registered Users
type: PropertyValue
value reference: Scale

Enterprise Plan Monthly Cost Per User
type: PropertyValue
value reference: Pricing

Free Plan Message History Retention
type: PropertyValue
value reference: Features

Third-Party Integrations Available
type: PropertyValue
value reference: Integrations

Daily Posts Published (Organic)
type: PropertyValue
value reference: Content

Free Plan External Guest Collaboration
type: PropertyValue
value reference: Features

Paid Plan Starting Price
type: PropertyValue
value reference: Pricing

Email Service Included
type: PropertyValue
value reference: Features

Cloud Storage (Base Plan)
type: PropertyValue
value reference: Storage

Monthly Cost Per User
type: PropertyValue
value reference: Pricing

Active Workspaces
type: PropertyValue
value reference: Adoption

Native Integrations
type: PropertyValue
value reference: Features

Message History Searchable
type: PropertyValue
value reference: Features

Threading Model
type: PropertyValue
value reference: Architecture

Open Source
type: PropertyValue
value reference: Licensing

Mobile App Type
type: PropertyValue
value reference: Mobile

Workflow Automation Steps
type: PropertyValue
value reference: Features

Native Video/Audio Calls
type: PropertyValue
value reference: Communication Features

Native App Integrations Available
type: PropertyValue
value reference: Integration Ecosystem

End-to-End Encryption Default
type: PropertyValue
value reference: Security

Monthly Cost (Pro Plan, 50 users)
type: PropertyValue
value reference: Pricing

Paid Workspaces/Users (Enterprise Adoption)
type: PropertyValue
value reference: Market Adoption

Monthly Cost (10 Users, Annual)
type: PropertyValue
value reference: Pricing

Pre-built Integrations
type: PropertyValue
value reference: Features

Message History on Free Plan
type: PropertyValue
value reference: Features

Active Global Workspaces/Deployments
type: PropertyValue
value reference: Market Adoption

Self-Hosted/On-Premises Option
type: PropertyValue
value reference: Deployment

Uptime SLA Guarantee
type: PropertyValue
value reference: Reliability

HIPAA Compliance Certified
type: PropertyValue
value reference: Compliance

Price Per User Per Month (Pro/Standard)
type: PropertyValue
value reference: Pricing

Base Monthly Cost (10-person team)
type: PropertyValue
value reference: Pricing

Cost for 50-person team
type: PropertyValue
value reference: Pricing

Message History Retention
type: PropertyValue
value reference: Features

Built-in Project Management
type: PropertyValue
value reference: Features

Real-time Messaging Speed
type: PropertyValue
value reference: Performance

File Storage Included
type: PropertyValue
value reference: Storage

Setup Time for New Team
type: PropertyValue
value reference: Ease of Use

Max Video Conference Participants
type: PropertyValue
value reference: Features

Voice Codec Quality Rating
type: PropertyValue
value reference: Audio

Enterprise Security Certifications
type: PropertyValue
value reference: Security

Time to Deploy
type: PropertyValue
value reference: Time to Value

Learning Curve
type: PropertyValue
value reference: Developer Experience

Uptime Guarantee
type: PropertyValue
value reference: Reliability

Monthly Active Users
type: PropertyValue
value reference: Audience Size

Pro Plan Monthly Cost
type: PropertyValue
value reference: Pricing

Video Conference Max Participants
type: PropertyValue
value reference: Features

Free Tier File Storage
type: PropertyValue
value reference: Storage

Message Search History (Free Tier)
type: PropertyValue
value reference: Features

Annual Subscription Cost (Pro, 100 users)
type: PropertyValue
value reference: Pricing

Desktop App Memory Usage
type: PropertyValue
value reference: Performance

Monthly subscription cost (Pro plan)
type: PropertyValue
value reference: Pricing

Message Search Response Time
type: PropertyValue
value reference: Performance

User interface satisfaction rating
type: PropertyValue
value reference: User Experience

Maximum video call participants (free tier)
type: PropertyValue
value reference: Video Conferencing

Service uptime SLA guarantee
type: PropertyValue
value reference: Reliability

Message history retention (free plan)
type: PropertyValue
value reference: Storage

Enterprise app marketplace size
type: PropertyValue
value reference: Extensibility

Team Size Cost Efficiency Threshold
type: PropertyValue
value reference: Pricing

Built-in Task Management
type: PropertyValue
value reference: Functionality

Message History Searchability
type: PropertyValue
value reference: Functionality

Average User Adoption Time
type: PropertyValue
value reference: User Experience

Global Active Users
type: PropertyValue
value reference: Market Reach

Monthly Subscription Cost (Pro/Standard)
type: PropertyValue
value reference: Pricing

Message Delivery Latency
type: PropertyValue
value reference: Performance

Message Search Speed (Free Tier)
type: PropertyValue
value reference: Features

File Upload Limit
type: PropertyValue
value reference: Storage

Message History Retention (Free Tier)
type: PropertyValue
value reference: Features

Native Microsoft 365 Integration
type: PropertyValue
value reference: Integration

G2 Ease of Use Rating (2024)
type: PropertyValue
value reference: User Experience

Video Meeting Participant Limit
type: PropertyValue
value reference: Features

Pro Plan Monthly Cost Per User
type: PropertyValue
value reference: Pricing

File Storage Per User
type: PropertyValue
value reference: Storage

Free Group Video Call Duration Limit
type: PropertyValue
value reference: Video Conferencing

Maximum Video Conference Participants (Free)
type: PropertyValue
value reference: Video Conferencing

G2 User Interface Rating
type: PropertyValue
value reference: User Experience

Message Search Capability
type: PropertyValue
value reference: Search & Discovery

Daily Active Users
type: PropertyValue
value reference: Adoption & Scale

End-to-End Encryption
type: PropertyValue
value reference: Security & Privacy

Message History (Free Plan)
type: PropertyValue
value reference: Data & Storage

Cost Per User (Annual, Lowest Paid Tier)
type: PropertyValue
value reference: Pricing

Self-Hosting Capability
type: PropertyValue
value reference: Deployment & Control

Organizations Using Platform
type: PropertyValue
value reference: Enterprise Adoption

GDPR Compliance
type: PropertyValue
value reference: Compliance & Regulation