# 3 Best Open-Source Alternatives to Rocket.Chat in 2026

By Noah — last updated & pricing verified September 15, 2026.

> 3 of the 5 Rocket.Chat alternatives we list qualify for this filter. The [full list](https://findalternative.to/rocket-chat) is the canonical page.

| Alternative | Best for | Price | Details |
| --- | --- | --- | --- |
| Mattermost | regulated, government, or defense organizations that need self-hosted, air-gapped, or sovereign-cloud team chat with compliance controls a SaaS-only tool like Slack can't provide | Free | https://findalternative.to/mattermost/about |
| Element | government, defense, and enterprise organizations that need self-hosted, end-to-end encrypted chat with the option to federate across organizational boundaries | Free | https://findalternative.to/element/about |
| Zulip | distributed and remote teams, open-source projects, and research groups who need many parallel conversations to stay organized without a flat, scrolling chat feed | Free tier · paid from $3.50/mo | https://findalternative.to/zulip/about |

All 5 alternatives to Rocket.Chat: https://findalternative.to/rocket-chat

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Markdown mirror of https://findalternative.to/rocket-chat/open-source — findalternative.to, honestly ranked software alternatives. AI info: https://findalternative.to/ai