head to head · open source
Mattermost vs Tuta
Mattermost has 39,093 GitHub stars, 9,000 forks, 1,012 open issues and last shipped yesterday. Tuta has 7,920 stars, 638 forks, 1,001 open issues and last shipped yesterday. Mattermost leads on adoption by 394% (39,093 vs 7,920 stars). Mattermost is written in TypeScript under a custom or non-standard licence; Tuta is written in TypeScript under GPL-3.0. Mattermost has attracted 23% as many forks as stars, Tuta 8%. Mattermost was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Mattermost | Tuta | |
|---|---|---|
| GitHub stars | ★ 39K | ★ 7.9K |
| License | Custom / other | GPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 9.0K | ⑂ 638 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mattermost if
- You weight community size — 39K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Tuta if
- You want the Tuta feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and Tuta fits your workflow better
About Mattermost
Mattermost is an open core, self hosted collaboration platform for teams that need secure chat, workflow automation, voice calling, screen sharing, and AI integration while keeping the deployment under their own control.
read the full Mattermost overview →
About Tuta
Tuta is an open source, end to end encrypted email, calendar and contacts service for individuals and teams who need private communication to work across every device they own.
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Frequently asked questions
Is Mattermost or Tuta more popular?
Mattermost has 39,093 GitHub stars and Tuta has 7,920. Mattermost has the larger community by that measure.
Are Mattermost and Tuta free?
Both are open source. Mattermost has no licence declared in this registry, and Tuta is licensed under GPL-3.0. Both are free to self-host.
What is the difference between Mattermost and Tuta?
Mattermost is written in TypeScript and Tuta in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Mattermost or Tuta?
Choose Mattermost if you want the larger community (39,093 stars) or its Custom / other licence terms. Choose Tuta if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.