MattermostvsSlack

Open source vs SaaS — side-by-side comparison

MattermostOpen Source

Secure, self-hosted team messaging platform as an alternative to Slack

Business messaging and team communication platform

Overview

MattermostSlack

TypeOpen SourceSaaS

CategoryCommunicationCommunication

PricingFree (self-hosted)$7.25/mo

Self-Hostable

LicenseMITProprietary

MattermostSlack

Stars35.6k--

Forks8.4k--

Contributors389--

Open Issues824--

Last CommitMar 2026--

Latest Release----

Data ownership — Self-host your data and maintain full control over your information

No vendor lock-in — Avoid recurring subscription costs and switch freely

Customizable — Modify the source code to fit your exact needs