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Mattermost

Slack alternative you control

provisional — pending verificationMIT/enterpriseself-hostable
Arete score
3.5 / 5
Autonomy4
Return4
Efficiency3
Transparency3
ἀρετή “AH-reh-tay” — excellence: a thing being good at what it’s for. Mean of the four principle scores. How we score →
Visit site ↗ Self-host with ValueIndex — join waitlist

Plain outbound link — no affiliate parameters, no tracking redirects.

~ Provisional — seeded estimate by a human researcher; full rubric pass pending. Working notes ↓

Why it's listed

Mattermost is listed in team chat & messaging because it competes on utility: slack alternative you control. It's VC-backed — we note this openly and watch the monetization path; the license and self-host route are the safeguards. Licensed MIT/enterprise; pricing: free (ce) / enterprise. Its resource footprint is reasonable for what it does, though not featherweight. This entry is provisional — the scores are seeded estimates pending our full manual rubric pass, and the verification date will appear here once complete.

Facts

License
MIT/enterprise
Pricing
Free (CE) / enterprise
Funding model
VC-backed OSS
Self-hostable
Yes — deploy difficulty: medium
Replaces
Slack
Verification
Provisional — scores are seeded estimates pending manual verification

Evidence notes

CE feature-gating to verify

Recorded during the rubric pass — every score must carry evidence a stranger could re-check.

Also in team chat & messaging

Spotted a problem — trackers added, dark patterns, abandonment? Report a violation. Scores change when evidence does.