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Mattermost

Mattermost is a self-hostable, open-source alternative to Slack. This page compiles its license, stack, deployment, maintenance and hosting details from public sources (updated 2026-06-15).

At a glance

category (analytics, CRM, file-storage, BI, etc.)
team-chat
SaaS-tool-it-replaces (e.g. 'Google Analytics', 'Notion')
Slack
license type (MIT, AGPL, GPL, BSL, etc.)
MIT + AGPL/Enterprise (mixed)
primary language/stack
Go, React, PostgreSQL
deployment method (Docker, Helm/K8s, bare-metal, one-click)
Docker, Helm, bare-metal
GitHub stars (snapshot, dated)
~31k (2025-06)
last-commit recency / maintenance activity
Very active
managed-hosting-available (yes/no + who offers it)
Yes - Mattermost Cloud (official)
minimum RAM/CPU footprint
~2 GB RAM recommended
has-active-community (Discord/forum size tier)
Large - forum

Slack alternative; enterprise features under separate license.

Official site / source ↗

Some links may be affiliate links that support this directory.

Alternatives in team-chat

Rocket.Chat

FAQ

What does Mattermost replace?
Mattermost is a self-hostable alternative to Slack.

What's notable about Mattermost?
Slack alternative; enterprise features under separate license.

Is the data here verified?
Yes — every entry is compiled from public sources and links out to its source.