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Slack vs Zulip
Slack vs Zulip
A side-by-side look at Slack (the paid SaaS) and Zulip (the open source alternative). Use this page to decide if the switch fits your team and workflow.
| Slack | Zulip | |
|---|---|---|
| Tagline | Team messaging with channels, threads, and integrations. | Threaded team chat with topics. |
| License | Proprietary SaaS | Apache-2.0 |
| Pricing | Free tier limited to 90 days of history; Pro from $7.25/user/month. | Free to self-host · optional paid hosted plan |
| Self-host option | No | Yes — difficulty 3/5 |
| Hosted cloud available | Yes (only option) | Yes |
| Desktop apps | Varies by product | Windows, macOS, Linux |
| Mobile apps | Official apps typically available | iOS, Android |
Ad slot — between tables
Best for
Async-heavy teams who like threaded topics.
Zulip strengths
- Topic-based threading prevents channel noise.
- Great for async and open-source communities.
- Powerful search and history.
Zulip weaknesses
- Topic model has a learning curve.
- Smaller ecosystem of third-party integrations.
- UI feels less polished than Slack.
What's the catch with Slack?
- Free tier message history cap makes it unusable for serious teams.
- Data residency concerns for EU and regulated industries.
- Per-seat pricing scales expensively.
Still unsure?
Check the full list of alternatives to Slack: see Slack alternatives, or learn more about Zulip on its project page.
Recommended reading
Why your team probably can't ditch Slack yet (and what needs to change)
Mattermost and Rocket.Chat are excellent. So why do most teams who try to migrate away from Slack end up back on Slack? An honest look at the real blockers.
When self-hosting goes wrong: seven failure modes and how to avoid them
An honest retrospective on the ways self-hosted setups break — not in theory, but in practice — and the small habits that prevent most of them.
Will the open source project you depend on still exist in three years?
Bus factor, maintainer burnout, funding models, and the signals that separate OSS projects that survive from those that quietly decay.