Yes. Mattermost is released under the AGPL-3.0 license and can be self-hosted at no software cost.

How difficult is it to self-host Mattermost?

Self-host difficulty is rated 3/5.

Open-source alternative

Mattermost

The open-source alternative to Slack

AGPL-3.0 TypeScript Difficulty 3/5 Health 85.0/100

mattermost is a free, self-hostable open-source alternative to Slack. Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. It is primarily written in TypeScript.

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39,232

Stars

9,030

Forks

1,045

Open issues

85.0

Health

Health score history

Tracked when GitHub metrics sync. Max one snapshot per 6 hours if unchanged.

0 pts

Oct 1 Oct 1

Latest: 85.0/100 · 39,232 stars

Pros & cons

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Why Mattermost?

Mattermost is a self-hostable open-source alternative to Slack , with health score 85.0/100 under the AGPL-3.0 license .

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