Last checked October 15, 2026

Mattermost

Mattermost is channels, threads, and playbooks for organizations that want chat on their own server. Team Edition is published as open source. Enterprise features need a subscription.

Open sourceMIT for Team Edition binaries; see Mattermost's license FAQ for source termsSmall teamsEnterprisesDevelopers

Mattermost's license FAQ lists Team Edition as MIT and says server source is also made available under AGPL. Enterprise features are commercial. Read the FAQ before you ship a fork.

MacWindowsLinuxiOSAndroidWebSelf-host

Website·Source

Free tier

Team Edition is free to self-host. Mattermost also sells cloud and Enterprise subscriptions.

Hosted

No hosted price recorded.

Self-host

Moderate. A single-server Docker or tarball install is documented. Preview and push notifications need extra setup. About $10–25/mo for a small team server. Unverified estimate.

Drop-in scores

Replacing Slack100% of the checklist checked.

Sources checked

https://docs.mattermost.com/product-overview/faq-license.html