head to head · open source
Mattermost vs Tuta
Mattermost has 39,510 GitHub stars, 9,087 forks, 1,012 open issues and last shipped yesterday. Tuta has 8,101 stars, 652 forks, 1,001 open issues and last shipped yesterday. Mattermost leads on adoption by 388% (39,510 vs 8,101 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.
← all 20902 open source comparisons
Side by side
| Mattermost | Tuta | |
|---|---|---|
| GitHub stars | ★ 40K | ★ 8.1K |
| License | Custom / other | GPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 652 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mattermost if
- You weight community size — 40K 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 that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th. Deploy Mattermost on premises, or try it for free in the cloud. Learn more about the following use cases with Mattermost: DevSecOps Incident Resolution IT Service Desk Other useful resources: Download and Install…
read the full Mattermost overview →
About Tuta
Tuta Mail makes encryption easy Tuta Mail is the secure email service with built in end to end encryption that enables you to communicate securely with anyone on all your devices. Forum for bug reports/feature requests: Roadmap: Issue and feature tracker: Please submit your feature requests via Reddit or via support mail. Web client • iOS App Store • Desktop Client Translating Tuta See TRANSLATING.md Building See BUILDING.md. Developing Tuta See HACKING.md. Contribution policy This project does not accept contributions or bug reports produced, in part or in full, with assistance of large language models…
More in Security & Privacy
Related comparisons
More Data Security & Privacy projects
Compare either of these against the rest of the Data Security & Privacy field.
Frequently asked questions
Is Mattermost or Tuta more popular?
Mattermost has 39,510 GitHub stars and Tuta has 8,101. 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 (39,510 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.