Mattermost
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open-source Slack alternative with self-hosted free tier
| Overview | |
|---|---|
| Company | Mattermost |
| URL | mattermost.com |
| Pricing | free— Professional $10/user/mo; Enterprise custom pricing (self-hosted free tier available) |
| License | open |
| Hosting | hybrid |
Self-hostable, MIT-licensed team chat closely modeled on Slack's channel-based UX -- includes a Slack export/import path to ease migration. Free self-hosted tier runs indefinitely with no per-seat licensing cost; paid tiers add SSO, compliance exports, and HIPAA/FedRAMP-aligned deployment options.
Usage Notes
Fewer native integrations than Slack out of the box -- most third-party connections go through incoming/outgoing webhooks rather than a marketplace, so budget some setup time. Good fit for teams that want a near drop-in Slack replacement and value Go-based, ops-friendly self-hosting.