Mattermost
#team-communication #chat #messaging #open-source #self-hosted #b2b
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Free tier
- Bandwidth
- n/a
- Builds
- n/a
- Requests
- Self-host unlimited teams, channels, full message history
- Custom domains
- n/a
- Note
- Open-source (AGPLv3) self-hostable Slack alternative. Free to self-host with unlimited teams, channels, full message history, file sharing, and integrations; Mattermost Cloud offers a free tier for small teams, and paid Professional from ~$10/user/mo adds enterprise compliance, SSO, and analytics.
Pricing
Paid plans start at $10/mo.
Editorial score
★ 24/100 free-tier generosity.
Last verified 2025-09-01.