head to head · open source
Mattermost vs Tongsuo
Mattermost has 39,097 GitHub stars, 9,006 forks, 1,012 open issues and last shipped yesterday. Tongsuo has 1,535 stars, 260 forks, 160 open issues and last shipped 12 days ago. Mattermost leads on adoption by 2,447% (39,097 vs 1,535 stars). Mattermost is written in TypeScript under a custom or non-standard licence; Tongsuo is written in C under Apache-2.0. Mattermost has attracted 23% as many forks as stars, Tongsuo 17%. 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 | Tongsuo | |
|---|---|---|
| GitHub stars | ★ 39K | ★ 1.5K |
| License | Custom / other | Apache-2.0 |
| Written in | TypeScript | C |
| Last push | 2026-09-18 | 2026-09-07 |
| Forks | ⑂ 9.0K | ⑂ 260 |
| 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 Tongsuo if
- You want the Tongsuo feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches C
- You evaluated both and Tongsuo 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 Tongsuo
Tongsuo (铜锁) is an open source C library of modern cryptographic primitives and secure communication protocols, developed under the OpenAtom Foundation, and it is built for teams that need Chinese commercial cryptography, TLS, PKI, and privacy preserving primitives from a single dependency.
read the full Tongsuo overview →
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Frequently asked questions
Is Mattermost or Tongsuo more popular?
Mattermost has 39,097 GitHub stars and Tongsuo has 1,535. Mattermost has the larger community by that measure.
Are Mattermost and Tongsuo free?
Both are open source. Mattermost has no licence declared in this registry, and Tongsuo is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Mattermost and Tongsuo?
Mattermost is written in TypeScript and Tongsuo in C. 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 Tongsuo?
Choose Mattermost if you want the larger community (39,097 stars) or its Custom / other licence terms. Choose Tongsuo if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.