Mattermost

Slack-like chat you can self-host. Team edition is open core.

MIT / proprietary editions · https://mattermost.com

Chat

Self-hosted

Hosting: Self-hosted Reviewed

Check which edition you run; some features are not open source.

  • Fair 4.7
  • Easy 3.7
  • Secure 4.0
FES Scores 9
Pillar Criterion Score Evidence
Easy Day-one UX Can non-technical staff use it without a project? 4 Feels familiar to Slack users. Source
Easy Operate Admin burden, updates, backups and language coverage. 3 You run the server and backups. Source
Easy Integrate SSO, mail/CalDAV, APIs and common NGO connectors. 4 SSO, webhooks and a plugin ecosystem. Source
Fair Lock-in / exit Can you leave with your data in open formats, at known cost? 5 Rule baseline (rubric_v1): self-host + open-source path supports exit with your data. Source
Fair Sovereignty EU legal entity, EU hosting, and exposure to extra-EU lawful access? 4 Rule baseline (rubric_v1): non-EU vendor; self-host still lets you pick EU infra — verify update/support exposure. Source
Fair Openness Open source or open standards? Are independent implementations possible? 5 Rule baseline (rubric_v1): license classified as open-source family. Source
Secure IT security Authentication, encryption, patch cadence and independent audit. 4 Depends on your hardening and edition. Source
Secure User security 2FA, roles, phishing resistance and safe defaults. 4 2FA and roles available. Source
Secure Personal data GDPR fit: DPA, residency, sub-processors and Schrems II posture. 4 No US SaaS if you host and avoid US plugins. Source

Indicative scores from public information — how we score.

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