Mattermost
mattermost.com
Open sourceNo card
Secure open-source collaboration platform for technical and developer teams.
- Free tier
- Yes
- Per month
- Free – $10/seat
- MCP
- No
Why it's here
Developer-focused, self-hosted chat with APIs and integrations; a practical free option, though SSO needs paid tiers.
Free tier
Self-hosted Starter edition with core messaging and integrations.
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Communication
#8 of 25Developer-focused, self-hosted chat with APIs and integrations; a practical free option, though SSO needs paid tiers.
| per month | StarterFreeSelf-hosted | Professional$10/seatbilled yearly | EnterpriseCustomContact sales |
|---|---|---|---|
| Full history | |||
| No seat minimum | |||
| API and bots | |||
| Unlimited apps | |||
| Custom domain | |||
| SSO | |||
| Free guests | |||
| Paid memberships | |||
| Data export | |||
| File storage | 100 GB | 500 GB | 1000 GB |