Mattermost vs Rocket.Chat

Mattermost vs Rocket.Chat
Fact	Mattermost	Rocket.Chat
Language	TypeScript	TypeScript
Licence	Other	Other
Stars	39k	46k
Latest	v11.11.1	8.9.0
Last push	2026-10-06	2026-10-06
Release cadence	too few releases	too few releases
Active contributors	50+ commit authors on the default branch in the last 90 days	31+ commit authors on the default branch in the last 90 days
Flags	none	none

How they relate

Rocket.Chat replaces Mattermost. Alternatives to Mattermost →
Full replacementChannels, threads and federation, self-hosted.
Both replace Microsoft Teams. Alternatives to Microsoft Teams →
PartialMattermostChat and calls on your own server, without the Microsoft 365 integration.
PartialRocket.ChatChat and calls on your own server, without the Microsoft 365 integration.
Both replace Slack. Alternatives to Slack →
Full replacementMattermostChannels, threads and calls on your own server, with an importer for Slack exports.
Full replacementRocket.ChatChannels, threads and federation on your own server, with an importer for Slack exports.

v12.0.0-rc32026-10-05Mattermost Platform Release 12.0.0-rc3pre-release
v11.10.3-rc12026-10-02Mattermost Platform Release 11.10.3-rc1pre-release
v12.0.0-rc22026-09-25Mattermost Platform Release 12.0.0-rc2pre-release
v11.11.12026-09-24Mattermost Platform Release 11.11.1 contains various bug fixes.
v12.0.0-rc12026-09-18Mattermost Platform Release 12.0.0-rc1pre-release

✓ signed The latest release, v11.11.1, carries a signature GitHub verified.

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unsigned The latest release, 8.9.0, carries no signature GitHub could verify.

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