Open-source self-hosted team collaboration platform with privacy-first design
Enterprise organizations, regulated industries, privacy-conscious companies, and teams requiring data sovereignty
Team messaging platform with 2,000+ app integrations and workflow automation tools.
Fast-growing companies, SaaS businesses, creative teams, and organizations valuing ease-of-use and rich integrations
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.
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).
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Enterprise organizations, regulated industries, privacy-conscious companies, and teams requiring data sovereignty
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| Metric | Mattermost | Slack | Diff |
|---|---|---|---|
| Base Monthly Cost Per User(USD) | $10.00 | $7.25 | +38% |
| Business+ Tier Monthly Cost Per User(USD) | $18.00 | $12.50 | +44% |
| Price Stability (2024-2026)(months) | Stable | No increases for 33 months |
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Choose Slack if
Fast-growing companies, SaaS businesses, creative teams, and organizations valuing ease-of-use and rich integrations
| — |
| Available Integrations(integrations) | 500+ | 2000+ | -75% |
| Daily Active Users(millions) | ~38 Million | ~38 Million | — |
| App Integrations(count) | 2,600+ | 2,600+ | — |
| Paid Starting Price(USD/user/mo) | $7.25 | $7.25 | — |
| Standalone Monthly Pricing (Pro Tier)(USD per user per month) | $7.25 | $7.25 | — |
| Annual Cost per User (Pro Tier)(USD) | $87 (billed yearly) | $87 (billed yearly) | — |
| Third-Party App Integrations(integrations) | 2,000+ | 2,000+ | — |
| Video Meeting Capacity(participants) | Up to 2,000 (with paid plan) | Up to 2,000 (with paid plan) | — |
| Mobile App Feature Parity(%) | 95% | 95% | — |
| Base Monthly Cost Per User(USD) | $12.50 (Slack Pro tier) | $12.50 (Slack Pro tier) | — |
| Free Tier Meeting Participant Limit(participants) | Unlimited (Slack Huddles for video limited to 50 participants) | Unlimited (Slack Huddles for video limited to 50 participants) | — |
| Asynchronous Communication Strength(scale 1-5) | 5 out of 5 (core feature with channels, threads, and history) | 5 out of 5 (core feature with channels, threads, and history) | — |
| Google Workspace Integration Level | 2 out of 5 (available via integration, not native) | 2 out of 5 (available via integration, not native) | — |
| AI Features Count (2026)(features) | 30+ (CRM tools, meeting summaries, automation, SlackBot enhancements) | 30+ (CRM tools, meeting summaries, automation, SlackBot enhancements) | — |
| Free Tier Cost(USD) | Free | Free | — |
| Pro/Standard Monthly Cost(USD per user/month) | $7.25 | $7.25 | — |
| Third-party Integrations(integrations) | 2000+ | 2000+ | — |
| Minimum Monthly Cost Per User(USD) | $7.25 | $7.25 | — |
| Third-Party Integrations Available(count) | 2,000+ | 2,000+ | — |
| Years Price Stable (2026)(months) | 33+ months | 33+ months | — |
| Native Integrations Available(count) | 2,200+ | 2,200+ | — |
| Pro Plan Annual Cost(USD per user/year) | $150 (billed monthly) | $150 (billed monthly) | — |
| Free Tier Message History Retention(days) | 90 days | 90 days | — |
| AI Transcription Languages Supported(languages) | 0 (not native feature) | 0 (not native feature) | — |
| Enterprise Uptime SLA(percent) | 99.99% | 99.99% | — |
| User Workspace Limit (Free Tier)(workspaces) | 1 workspace | 1 workspace | — |
| Maximum Meeting Participants (Free)(participants) | 3 participants | 3 participants | — |
| Pro Plan Monthly Cost (Annual Billing)(USD/user/month) | $8.75 | $8.75 | — |
| Available Integrations(count) | 2,000+ integrations | 2,000+ integrations | — |
All figures sourced from publicly available data. Last updated Jun 2026.
Mattermost
Self-hosted, on-premise, or cloud options🏆
Slack
Cloud-based SaaS only
Mattermost
Open-source free tier + $10/user/month (Pro)🏆
Slack
$7.25/user/month (Pro) + Enterprise Grid
Mattermost
Full control with self-hosting, data sovereignty🏆
Slack
Salesforce controls infrastructure and data
Mattermost
Limited native AI, basic automation
Slack
Advanced AI assistant, extensive integrations🏆
Mattermost
Requires technical expertise for deployment
Slack
Instant setup, no installation needed🏆
Mattermost
500+ integrations available
Slack
2000+ integrations and app ecosystem🏆
Mattermost
Functional but less polished interface
Slack
Intuitive, modern, user-friendly design🏆
Mattermost
SOC 2, HIPAA, GDPR compliant (self-hosted)
Slack
SOC 2, HIPAA, GDPR, FedRAMP compliant
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.
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| Attribute | Mattermost | Slack |
|---|---|---|
| Base Monthly Cost Per User(USD) | $10.00 | $7.25 |
| Business+ Tier Monthly Cost Per User(USD) | $18.00 | $12.50 |
| Price Stability (2024-2026)(months) | Stable | No increases for 33 months |
| Standalone Monthly Pricing (Pro Tier)(USD per user per month) | $7.25 | — |
| Annual Cost per User (Pro Tier)(USD) | $87 (billed yearly) | — |
Show 6 more attributesBase Monthly Cost Per User(USD) $12.50 (Slack Pro tier) — Free Tier Cost(USD) Free — Pro/Standard Monthly Cost(USD per user/month) $7.25 — Minimum Monthly Cost Per User(USD) $7.25 — Years Price Stable (2026)(months) 33+ months — Pro Plan Annual Cost(USD per user/year) $150 (billed monthly) — | ||
| Deployment Options | Self-hosted, on-premise, cloud | Cloud-based SaaS only |
| GDPR & Data Sovereignty Compliance | Full control with self-hosting option | Compliant but data on Salesforce servers |
| End-to-End Encryption Available | DMs only, Enterprise+ plan | — |
| Available Integrations(integrations) | 500+ | 2000+ |
| Available Integrations(count) | 2,000+ integrations | — |
| Open Source | Yes, fully open-source | No, proprietary |
| Enterprise AI Features | Basic automation and workflows | Advanced AI assistant, smart summaries, automation |
| Video Meeting Capacity(participants) | Up to 2,000 (with paid plan) | — |
| Native Office Integration | Limited (third-party connectors) | — |
| AI Copilot Features | Slack AI (summarization, search, assisted writing) | — |
| Free Tier Meeting Participant Limit(participants) | Unlimited (Slack Huddles for video limited to 50 participants) | — |
Show 4 more attributesNative Video Conferencing Huddles for brief video, limited to 50 participants; requires external tool for full conferencing — Meeting Recording & Auto-Transcription Not native; requires integration with Otter.ai or similar third-party services — Asynchronous Communication Strength(scale 1-5) 5 out of 5 (core feature with channels, threads, and history) — Third-Party Integrations Available(count) 2,000+ — | ||
| Daily Active Users(millions) | ~38 Million | — |
| App Integrations(count) | 2,600+ | — |
| Third-party Integrations(integrations) | 2000+ | — |
| Paid Starting Price(USD/user/mo) | $7.25 | — |
| Third-Party App Integrations(integrations) | 2,000+ | — |
| Google Workspace Native Integration | Limited (requires custom setup) | — |
| Native Integrations Available(count) | 2,200+ | — |
| Message Search Speed(qualitative) | Excellent - optimized search indexing | — |
| Mobile App Feature Parity(%) | 95% | — |
| Google Workspace Integration Level | 2 out of 5 (available via integration, not native) | — |
| AI Features Count (2026)(features) | 30+ (CRM tools, meeting summaries, automation, SlackBot enhancements) | — |
| Maximum Meeting Participants(participants) | Unlimited group chats | — |
| AI Features (2026) | Workflow automation, search enhancement | — |
| Real-Time Translation | Not available | — |
| Asynchronous Communication | Optimized with threads and archives | — |
| Zoom Rooms Cost(USD per room/month) | N/A | — |
| AI Assistant Capability | Slack AI (optional on paid plans) | — |
| AI Transcription Languages Supported(languages) | 0 (not native feature) | — |
| AI Meeting Assistant | Slack AI (search, summarization, drafting) | — |
| Workflow Automation Complexity | Advanced with conditional logic | — |
| Storage Per User (Standard Plan)(GB) | Variable by plan | — |
| Maximum Video Length (Free Tier)(minutes) | N/A | — |
| Maximum Video Resolution(pixels @ fps) | Requires 3rd party | — |
| Free Tier Message History Retention(days) | 90 days | — |
| Enterprise Uptime SLA(percent) | 99.99% | — |
| User Workspace Limit (Free Tier)(workspaces) | 1 workspace | — |
| Maximum Meeting Participants (Free)(participants) | 3 participants | — |
| Maximum Meeting Participants (Paid)(participants) | Unlimited (slide deck view only) | — |
| Free Plan Message History(months) | 90 days | — |
| Pro Plan Monthly Cost (Annual Billing)(USD/user/month) | $8.75 | — |
| FedRAMP Authorization | No | — |
Side-by-side comparison of numeric attributes