Mattermost
US · United StatesOpen-source, self-hostable messaging and collaboration platform. The company is US-based; the software is widely self-hosted within Europe.
A transparent score of the public sovereignty signals recorded below — not a compliance verdict, and absence of a signal never counts against a company.
- +10Self-hosting option
- +10Open source
Sovereignty assessment
Reviewed 18 June 2026Each line summarises public information reviewed by SovEU, with a confidence level and a link to the source where available. It is not a compliance verdict.
- HQ jurisdictionUnited StatesMedium
Based on public information reviewed on 18 June 2026.
Evidence - Self-hosting optionYesMedium
Based on public information reviewed on 18 June 2026.
Evidence - Open sourceYesMedium
Based on public information reviewed on 18 June 2026.
Evidence
Evidence reviewed
Signals
- Self-hostable
- Open source
A European alternative to
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