Rocket.Chat
Communication - Custom Communication SystemsCommunications platform that puts data protection first (alternative to Gitter.im and Slack).
- Stars
- ★ 46.3k
- Licence
- MIT
- Updated
- Docker
Self-hosted alternatives to Slack
Last updated · 3 options
Quick answer: Rocket.Chat has the most stars on its repository of the 3 options here (★ 46.3k), followed by Mattermost (★ 39.4k). Stars show popularity, not fit, so check formats, platforms and licence for your own work.
Team chat and messaging. Here are 3 self-hosted options, most-starred first.
Mattermost
Communication - Custom Communication SystemsPlatform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).
- Stars
- ★ 39.4k
- Licence
- Proprietary
- Updated
- Docker
Zulip
Communication - Custom Communication SystemsZulip is a powerful, open source group chat application.
- Stars
- ★ 26.1k
- Licence
- Apache-2.0
- Updated
- Runs on ARM
Alternative to Slack
No tools match these filters. Suggest one.
The ARM filter only shows apps whose own docs say they run on ARM or a Raspberry Pi. Others may work too.
FAQ
Is there a self-hosted alternative to Slack?
Yes. SelfHostAlts lists 3 options: Rocket.Chat, Mattermost and Zulip.
Which Slack alternatives are open source?
Rocket.Chat (MIT) and Zulip (Apache-2.0). The others are free or freemium but not open source.
Which Slack alternatives can run with Docker?
Rocket.Chat and Mattermost. The other listed here isn't listed for Docker.
Related categories: Communication - Custom Communication Systems
Self-hosted apps are rarely drop-in replacements. Check the import options, mobile apps and requirements before you move your data, and keep backups.