Slack vs Zulip
Slack
Cloud-based SaaS team communication platform with 2,400+ integrations and 750,000+ active workspaces.
Mid-to-large enterprises (100+ employees), startups with VC funding, teams requiring deep integrations with Salesforce/Jira/GitHub, distributed workforces needing robust mobile experiences
Zulip
Open-source team chat with topic-based threading, designed for organized asynchronous communication and cost-effective deployment.
Small-to-medium teams (10-500 people), open-source communities, organizations in regulated industries (healthcare, finance), companies prioritizing data sovereignty, teams with in-house DevOps/engineering capacity
Short Answer
Slack dominates enterprise adoption with 750,000+ active workspaces and advanced integrations, while Zulip offers superior conversation threading, lower costs, and open-source flexibility for teams prioritizing organized asynchronous communication.
Our Verdict
AI-assistedChoose Slack if your organization needs maximum ecosystem integration, extensive third-party app support, and best-in-class mobile apps for a large distributed team. Choose Zulip if you prioritize conversation organization, lower total cost of ownership, want transparent open-source infrastructure, or operate in regulated industries requiring data control.
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Choose Slack if
Mid-to-large enterprises (100+ employees), startups with VC funding, teams requiring deep integrations with Salesforce/Jira/GitHub, distributed workforces needing robust mobile experiences
Choose Zulip if
Small-to-medium teams (10-500 people), open-source communities, organizations in regulated industries (healthcare, finance), companies prioritizing data sovereignty, teams with in-house DevOps/engineering capacity
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Key Differences at a Glance
Key Facts & Figures
| Metric | Slack | Zulip | Diff |
|---|---|---|---|
| Daily Active Users(millions) | ~38 Million | — | — |
| App Integrations(count) | 2,600+ | — | — |
| Paid Starting Price(USD/user/mo) | $7.25 | — | — |
| Standalone Monthly Pricing (Pro Tier)(USD per user per month) | $7.25 | — | — |
| Annual Cost per User (Pro Tier)(USD) | $87 (billed yearly) | — | — |
| Third-party App Integrations(integrations) | 2,000+ | — | — |
| Video Meeting Capacity(participants) | Up to 2,000 (with paid plan) | — | — |
| Mobile App Feature Parity(%) | 95% | — | — |
| Base Monthly Cost Per User(USD) | $8 | — | — |
| Free Tier Meeting Participant Limit(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) | — | — |
| 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) | — | — |
| Base Monthly Cost Per User(USD) | $7.25 | — | — |
| Business+ Tier Monthly Cost Per User(USD) | $12.50 | — | — |
| Available Integrations(integrations) | 2000+ | — | — |
| Price Stability (2024-2026)(months) | No increases for 33 months | — | — |
| Free Tier Cost(USD) | Free | — | — |
| Pro/Standard Monthly Cost(USD per user/month) | $7.25 | — | — |
| Third-party Integrations(integrations) | 2000+ | — | — |
| Minimum Monthly Cost Per User(USD) | $7.25 | — | — |
| Third-Party Integrations Available(count) | 2,000+ | — | — |
| Years Price Stable (2026)(months) | 33+ months | — | — |
| Native Integrations Available(count) | 2,200+ | — | — |
| Pro Plan Annual Cost(USD) | $150 (billed monthly) | — | — |
| Free Tier Message History Retention(days) | 90 days | — | — |
| AI Transcription Languages Supported(languages) | 0 (not native feature) | — | — |
| Enterprise Uptime SLA(percent) | 99.99% | — | — |
| User Workspace Limit (Free Tier)(workspaces) | 1 workspace | — | — |
| Maximum Meeting Participants (Free)(participants) | 3 participants | — | — |
| Pro Plan Monthly Cost (Annual Billing)(USD per user) | $8.75 | — | — |
| Available Integrations(count) | 2,000+ integrations | — | — |
| Monthly Cost (Pro Plan)(USD) | $12.50 per user/month | — | — |
| Free Message History(days) | 90 days maximum | — | — |
| Voice Audio Codec Quality(kHz) | 16 kHz | — | — |
| Third-Party Integrations(number) | 2,000+ official apps | — | — |
| Maximum Video Call Participants(people) | 15 participants | — | — |
| Total Registered Users(millions) | 750 million | — | — |
| Enterprise Plan Monthly Cost Per User(USD) | $12.50 | — | — |
| Free Plan Message History Retention(days) | 90 days | — | — |
| Third-Party Integrations Available(integrations) | 2,300+ integrations | — | — |
| Paid Plan Starting Price(USD/month) | $12.50 (Pro per-user) | — | — |
| Cloud Storage (Base Plan)(GB) | 10 GB | — | — |
| Monthly Cost per User(USD) | $8-12.50 (Pro/Business+) | $0 self-hosted / $100-500 flat cloud | — |
| Active Workspaces(workspaces) | 750,000+ | 5,000-10,000 estimated | +9900% |
| Native Integrations(count) | 2,300+ | ~400 | +475% |
| Message History Searchable(years) | 10 years standard | Unlimited (self-hosted) | — |
| Workflow Automation Steps(built-in steps) | 50+ | Custom via integrations (~15 standard) | +233% |
| Native App Integrations Available(count) | 2,400+ apps | — | — |
| Monthly Cost (Pro Plan, 50 users)(USD) | $412.50/month | — | — |
| Message History Retention (Free Plan)(days) | 90 days (10,000 message limit) | — | — |
| Paid Workspaces/Users (Enterprise Adoption)(workspaces) | 750,000+ paid workspaces | — | — |
| Monthly Cost (10 Users, Annual)(USD) | $150/month ($1,800/year) | — | — |
| Pre-built Integrations(integrations) | 2,400+ integrations | — | — |
| Message History on Free Plan(days) | 90-day limited access | — | — |
| Active Global Workspaces/Deployments(count) | 750,000+ active workspaces | — | — |
| Uptime SLA Guarantee(percent) | 99.99% | — | — |
| Price Per User Per Month (Pro/Standard)(USD) | $12.50/user (Pro plan) | — | — |
All figures sourced from publicly available data. Last updated Jun 2026.
Key Differences
Slack
$8-12.50 per user/month (Pro/Business+)
Zulip
$0 (self-hosted) or $100-500/month (Cloud)🏆
Slack
Channel-based with nested threads (limited context)
Zulip
Topic-based threading within streams (complete conversation isolation)🏆
Slack
750,000+ workspaces🏆
Zulip
~5,000-10,000 estimated workspaces
Slack
2,300+ native integrations🏆
Zulip
~400 integrations
Slack
Proprietary (closed-source)
Zulip
Fully open-source with self-hosting🏆
Slack
Search across 10 years of history (standard)
Zulip
Full searchable history (unlimited retention)
Slack
Native iOS/Android, feature-parity with desktop🏆
Zulip
Web-based mobile, limited native features
Full Comparison
| Attribute | Slack |  Zulip |
|---|---|---|
| Daily Active Users(millions) | ~38 Million | — |
| Monthly Active Users(millions) | 215 million | — |
| App Integrations(count) | 2,600+ | — |
| Google Workspace Native Integration | Limited (requires custom setup) | — |
| Native Integrations(count) | 2,300+ | ~400 |
| Paid Starting Price(USD/user/mo) | $7.25 | — |
| Standalone Monthly Pricing (Pro Tier)(USD per user per month) | $7.25 | — |
| Annual Cost per User (Pro Tier)(USD) | $87 (billed yearly) | — |
| Base Monthly Cost Per User(USD) | $8 | — |
| Base Monthly Cost Per User(USD) | $7.25 | — |
| Business+ Tier Monthly Cost Per User(USD) | $12.50 | — |
Show 14 more attributesPrice Stability (2024-2026)(months) No increases for 33 months — 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) $150 (billed monthly) — Pro Plan Monthly Cost (Annual Billing)(USD per user) $8.75 — Monthly Cost (Pro Plan)(USD) $12.50 per user/month — Enterprise Plan Monthly Cost Per User(USD) $12.50 — Paid Plan Starting Price(USD/month) $12.50 (Pro per-user) — Monthly Cost per User(USD) $8-12.50 (Pro/Business+) $0 self-hosted / $100-500 flat cloud Monthly Cost (Pro Plan, 50 users)(USD) $412.50/month — Monthly Cost (10 Users, Annual)(USD) $150/month ($1,800/year) — Price Per User Per Month (Pro/Standard)(USD) $12.50/user (Pro plan) — | ||
| Third-party App Integrations(integrations) | 2,000+ | — |
| Available Integrations(integrations) | 2000+ | — |
| Available Integrations(count) | 2,000+ integrations | — |
| Third-Party Integrations Available(integrations) | 2,300+ integrations | — |
| Pre-built Integrations(integrations) | 2,400+ integrations | — |
| 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) | — |
| Native Video Conferencing | Huddles for brief video, limited to 50 participants; requires external tool for full conferencing | — |
Show 12 more attributesMeeting 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+ — Enterprise AI Features Advanced AI assistant, smart summaries, automation — Native Integrations Available(count) 2,200+ — Free Message History(days) 90 days maximum — Free Plan Message History Retention(days) 90 days — Free Plan External Guest Collaboration(capacity) Unlimited external guests via workspace invite — Email Service Included No — Message History Searchable(years) 10 years standard Unlimited (self-hosted) Workflow Automation Steps(built-in steps) 50+ Custom via integrations (~15 standard) Message History on Free Plan(days) 90-day limited access — | ||
| Message Search Speed(seconds) | Excellent - optimized search indexing | — |
| Voice Audio Codec Quality(kHz) | 16 kHz | — |
| Maximum Video Call Participants(people) | 15 participants | — |
| Mobile App Feature Parity(%) | 95% | — |
| Mobile App Type | Native iOS/Android with feature-parity | Web-based with limited native apps |
| 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) | — |
| Deployment Options | Cloud-based SaaS only | — |
| GDPR & Data Sovereignty Compliance | Compliant but data on Salesforce servers | — |
| End-to-End Encryption Available | DMs only, Enterprise+ plan | — |
| End-to-End Encryption Default | Not available | — |
| Maximum Meeting Participants(participants) | Unlimited group chats | — |
| Third-party Integrations(integrations) | 2000+ | — |
| Third-Party Integrations(number) | 2,000+ official apps | — |
| 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 | — |
| Cloud Storage (Base Plan)(GB) | 10 GB | — |
| Open Source | No, proprietary | — |
| Maximum Video Length (Free Tier)(minutes) | N/A | — |
| Maximum Video Resolution(pixels) | Requires 3rd party | — |
| Free Tier Message History Retention(days) | 90 days | — |
| Message History Retention (Free Plan)(days) | 90 days (10,000 message limit) | — |
| Enterprise Uptime SLA(percent) | 99.99% | — |
| Uptime SLA Guarantee(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 | — |
| FedRAMP Authorization | No | — |
| SOC 2 Type II Certified | Yes | — |
| HIPAA Compliance Certified | Yes (Business+ plan required) | — |
| Custom Workflow Automation | Advanced (Workflow Builder, automations) | — |
| Users Per Workspace(count) | Unlimited | — |
| Total Registered Users(millions) | 750 million | — |
| Daily Posts Published (Organic)(millions) | N/A | — |
| Active Workspaces(workspaces) | 750,000+ | 5,000-10,000 estimated |
| Threading Model | Channel-based threads (contextual loss in active channels) | Topic-based (complete conversation isolation within streams) |
| Open Source(boolean) | Proprietary (closed-source) | Apache 2.0 open-source |
| Native Video/Audio Calls | Yes (Slack Huddles) | — |
| Native App Integrations Available(count) | 2,400+ apps | — |
| Self-Hosting Capability | No, cloud-only | — |
| Self-Hosted/On-Premises Option | No (cloud-only) | — |
| Paid Workspaces/Users (Enterprise Adoption)(workspaces) | 750,000+ paid workspaces | — |
| Active Global Workspaces/Deployments(count) | 750,000+ active workspaces | — |
| Source Code Availability(null) | Proprietary/closed | — |
ZulipShow 14 more attributes
Show 12 more attributes
Visual Comparison
Side-by-side comparison of numeric attributes
Pros & Cons
Slack
Pros
- 2,300+ native integrations with enterprise tools (Salesforce, Jira, GitHub, Zendesk)
- Feature-parity native apps for iOS, Android, macOS, Windows with offline support
- Advanced workflow automation via Slack Workflows and API (50+ built-in steps)
- Sophisticated user management with SSO, SCIM provisioning, and audit logs
- Largest ecosystem with 150,000+ Slack apps in App Directory
Cons
- High cost at $8-12.50/user/month ($96-150/year per user for 100-person team = $9,600-15,000 annually)
- Conversation threading limited—threads exist in channels but don't fully isolate topics, causing context loss in active channels
Zulip
Pros
- Fully open-source (Apache 2.0) enabling complete code control, security audits, and compliance customization
- Topic-based threading architecture naturally organizes conversations—each topic within a stream is independent, preventing context fragmentation
- Self-hosted option eliminates ongoing per-user licensing ($0 cost after infrastructure setup); cloud option at $100-500/month flat-rate for unlimited users
- Superior asynchronous communication—topics display full context without scrolling through threaded chains
- HIPAA/GDPR-ready with self-hosting; no data residency concerns
Cons
- Limited integrations (~400) compared to Slack's 2,300+; fewer pre-built connectors for enterprise SaaS tools
- Smaller ecosystem: ~150 community bots vs Slack's 150,000 apps, requiring more custom development
Frequently Asked Questions
Yes, significantly. For a 100-person team, Slack costs $8,000-12,000/year (at $8-12/user/month), while Zulip cloud is flat $100-500/month ($1,200-6,000/year). Self-hosted Zulip costs zero per-user after infrastructure setup. Slack only becomes cost-competitive for very small teams (under 10 people).
Resources & Learn More
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