Mattermost
Mattermost is an open-source, self-hosted app in the Team Chat category, licensed AGPL-3.0 and written mainly in TypeScript. It is a self-hosted alternative to Slack and ships a Docker image. It has 39,434 GitHub stars and its last commit was on Oct 26, 2026 (data as of Oct 26, 2026).
GitHub stats
- GitHub stars
- 39,434
- Forks
- 9,070
- Open issues
- 625
- Commits, last 12 months
- 2,159
- Last commit
- Oct 26, 2026
- Latest release
- v12.0.1Oct 22, 2026
- Created
- Jun 15, 2015
- License
- AGPL-3.0Open source
Data as of from the GitHub API. Report an error
Project health
ActiveActive: last commit Oct 26, 2026, 2,159 commits in 12 months.
- Regular releases9 releases in 12 months
- Welcomes contributors232 open good-first-issue or help-wanted issues and a contributing guide
- Security policyPublishes a security policy on GitHub
| Last commit | Oct 26, 2026 |
|---|---|
| Commits, last 12 months | 2,159 |
| Latest release | v12.0.1 (Oct 22, 2026) |
| Releases, last 12 months | 9 |
| Releases, all time | 1,046 |
| Open issues | 625 |
| Open pull requests | 459 |
| Good first issues | 14 |
| Contributing guide | Yes |
| Security policy | Yes |
| Created | Jun 15, 2015 |
Health as of , from the GitHub API. A label describes activity, not quality or security. How we label project health · Report a data error
About Mattermost
Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).
Description adapted from awesome-selfhosted (CC BY-SA 3.0). Source code: github.com/mattermost/mattermost.
Topics
- collaboration
- mattermost
- golang
- react-native
- hacktoberfest
- monorepo
- react
Open-source alternative to
Mattermost can replace these commercial products. Compare every option on each page.
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Mattermost compared
Head-to-head comparisons with a clear verdict on when to pick Mattermost.
Mattermost vs Rocket.Chat
Pick Mattermost if you want a Slack-like chat built for engineering and DevOps teams; pick Rocket.Chat if you want an MIT core with omnichannel customer chat and federation.
Mattermost vs Zulip
Pick Mattermost if you want Slack-style channels with DevOps workflows and enterprise options; pick Zulip if you want topic-based threading and a fully Apache-2.0 server.
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Is Mattermost free and open source?
Yes. Mattermost is open-source software released under the AGPL-3.0 license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.
Can I run Mattermost with Docker?
Yes. Mattermost provides a Docker image, so you can run it on any Linux server with Docker and Docker Compose installed. The project README lists the image name and the environment variables to set.
What are the best alternatives to Mattermost?
Popular self-hosted alternatives to Mattermost include Rocket.Chat, Novu and Chatwoot. Mattermost itself is a self-hosted alternative to Slack.
Is Mattermost actively maintained?
The most recent commit to Mattermost was on Oct 26, 2026 with 2,159 commits in the past twelve months. The latest release is v12.0.1, published Oct 22, 2026. It had 625 open issues on GitHub. appsgit's project-health label for it is "Active" as of Oct 26, 2026.