head to head · open source
Mattermost vs Peergos
Mattermost has 39,510 GitHub stars, 9,087 forks, 1,012 open issues and last shipped yesterday. Peergos has 2,546 stars, 204 forks, 103 open issues and last shipped yesterday. Mattermost leads on adoption by 1,452% (39,510 vs 2,546 stars). Mattermost is written in TypeScript under a custom or non-standard licence; Peergos is written in Java under AGPL-3.0. Mattermost has attracted 23% as many forks as stars, Peergos 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 | Peergos | |
|---|---|---|
| GitHub stars | ★ 40K | ★ 2.5K |
| License | Custom / other | AGPL-3.0 |
| Written in | TypeScript | Java |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 204 |
| 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 Peergos if
- You want the Peergos feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Java
- You evaluated both and Peergos 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 Peergos
Peergos ======== Peergos is building the next web the private web, where end users are in control. Imagine web apps being secure by default and unable to track you. Imagine being able to control exactly what personal data each web app can see. Imagine never having to log in to an app ever again. You own your data and decide where it is stored and who can see it. At Peergos, we believe that privacy is a fundamental human right and we want to make it easy for everyone to interact online in ways that respect this right. The foundation of Peergos is a peer to peer encrypted global filesystem with fine grained access…
read the full Peergos overview →
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Frequently asked questions
Is Mattermost or Peergos more popular?
Mattermost has 39,510 GitHub stars and Peergos has 2,546. Mattermost has the larger community by that measure.
Are Mattermost and Peergos free?
Both are open source. Mattermost has no licence declared in this registry, and Peergos is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between Mattermost and Peergos?
Mattermost is written in TypeScript and Peergos in Java. 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 Peergos?
Choose Mattermost if you want the larger community (39,510 stars) or its Custom / other licence terms. Choose Peergos if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.