What is the difference between Mattermost and Zulip?

Mattermost is best for Teams that need self-hosted, privacy-first messaging, while Zulip is best for Open-source communities and teams wanting threaded messaging. Mattermost starts at Free (self-hosted) and Zulip starts at Free.

Is Mattermost or Zulip cheaper?

Mattermost starts at Free (self-hosted) and is free. Zulip starts at Free and is free.

Is there a free alternative to Zulip?

Both Mattermost and Zulip offer free tiers.

Mattermost vs Zulip

Mattermost is open-source, self-hosted team messaging platform for organizations that need data sovereignty, while Zulip is open-source team chat with a unique topic-based threading model for organized conversations. Mattermost is built for teams that need self-hosted, privacy-first messaging, whereas Zulip targets open-source communities and teams wanting threaded messaging.

At a glance

	Mattermost	Zulip
Best for	Teams that need self-hosted, privacy-first messaging	Open-source communities and teams wanting threaded messaging
Starting price	Free (self-hosted)	Free
Free tier	✓	✓
Open source	✓	✓
Free tier available	✓	✓
Open source	✓	✓
Channels	✓	—
Compliance	✓	—
Integrations	✓	—
Markdown	—	✓
Open Source	—	✓
Playbooks	✓	—
Self-Hosted	✓	✓
Topic Threading	—	✓

Mattermost

Strengths

Self-hosted — full control over your data
Open source with active community
Slack-compatible interface, easy migration
Strong compliance and security features

Weaknesses

Requires server management if self-hosting
Smaller integration ecosystem than Slack
Cloud-hosted version is more expensive than Slack
Mobile apps lag behind Slack and Teams in polish

Try Mattermost → Full review

Zulip

Strengths

Open source and transparent
Topic-based threading keeps conversations organized by subject, not just time
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
The core product is free with no paywalled essentials

Weaknesses

May lack some advanced features
Self-hosting is free but requires server maintenance and DevOps knowledge
Self-hosting requires Linux admin skills and ongoing server maintenance
Notification overload is a real problem as the number of channels grows

Try Zulip → Full review

The bottom line

Pricing: Both Mattermost and Zulip are free, so this decision comes down to features and philosophy rather than budget.

Feature gaps: Mattermost offers Channels, Compliance and Integrations that Zulip lacks. Zulip brings Markdown, Open Source and Topic Threading that Mattermost does not have. Both share Self-Hosted.

Team fit: Mattermost is geared toward mid-size teams teams, while Zulip is aimed at any size teams. Pick the one that matches where your team is today and where it is headed — migrating tools later is always painful.

Open source: Both Mattermost and Zulip are open source, so self-hosting and code audits are on the table with either choice.

Where each tool shines: Mattermost's biggest strengths are: self-hosted — full control over your data. open source with active community. Zulip's biggest strengths are: open source and transparent. topic-based threading keeps conversations organized by subject, not just time.

Watch out for: With Mattermost, users commonly note that requires server management if self-hosting. With Zulip, the main complaint is that may lack some advanced features.

Choose Mattermost if...

Your profile matches its sweet spot: teams that need self-hosted, privacy-first messaging
You specifically need Channels and Compliance
You care about open source with active community
Your team size fits the mid-size teams profile Mattermost is designed for

Choose Zulip if...

You need a tool built for open-source communities and teams wanting threaded messaging
You specifically need Markdown and Open Source
You care about topic-based threading keeps conversations organized by subject, not just time
Your team size fits the any size profile Zulip is designed for