head to head · open source
Mattermost vs Cinny
Mattermost has 39,510 GitHub stars, 9,087 forks, 1,012 open issues and last shipped yesterday. Cinny has 3,961 stars, 607 forks, 354 open issues and last shipped yesterday. Mattermost leads on adoption by 897% (39,510 vs 3,961 stars). Mattermost is written in TypeScript under a custom or non-standard licence; Cinny is written in TypeScript under AGPL-3.0. Mattermost has attracted 23% as many forks as stars, Cinny 15%. Mattermost was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (hacktoberfest), so they are genuine substitutes rather than adjacent tools.
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 | Cinny | |
|---|---|---|
| GitHub stars | ★ 40K | ★ 4.0K |
| License | Custom / other | AGPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 607 |
| 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 Cinny if
- You want the Cinny feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and Cinny 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 Cinny
Cinny A Matrix client focusing primarily on simple, elegant and secure interface. The main goal is to have an instant messaging application that is easy on people and has a modern touch. Roadmap Contributing [!IMPORTANT] We are currently in the process of [replacing] the matrix js sdk with our own SDK. As a result, we will not be accepting any pull requests until further notice. Thank you for your understanding. [replacing]: Getting started The web app is available at [app.cinny.in] and gets updated on each new release. The dev branch is continuously deployed at [dev.cinny.in] but keep in mind that it could have…
read the full Cinny overview →
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Frequently asked questions
Is Mattermost or Cinny more popular?
Mattermost has 39,510 GitHub stars and Cinny has 3,961. Mattermost has the larger community by that measure.
Are Mattermost and Cinny free?
Both are open source. Mattermost has no licence declared in this registry, and Cinny is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between Mattermost and Cinny?
Mattermost is written in TypeScript and Cinny 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 Cinny?
Choose Mattermost if you want the larger community (39,510 stars) or its Custom / other licence terms. Choose Cinny if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.