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Mattermost
By Mattermost, Inc. · mattermost.com
3,8 Good
Open-source team chat that can run entirely on your own servers in the EU. The cloud service is however in the USA (AWS us-east-1), the company is American (Palo Alto) and self-hosting requires technical skills.
Best for: Technically skilled teams that want to self-host a Slack-like chat on their own EU servers.
Pros
- Open source, can be self-hosted freely with full data control
- EU data storage possible via self-hosting or managed partner
- Powerful integrations, plugins and APIs
Cons
- Cloud service stores data in the USA (AWS us-east-1), American parent company with CLOUD Act risk
- Self-hosting requires technical operation and maintenance
- No Swedish language support or local support
Quick facts
| Price | Freemium |
|---|---|
| Origin | Outside EU (Mattermost, Inc.) |
| Categories | Collaboration |
| EU data storage | No |
| GDPR terms (DPA) | Yes |
Certifications
ISO 27001SOC 2
Source: vendor trust center →
Sources & evidence
Claims about data storage, jurisdiction and compliance should be verifiable. Here is the evidence behind the statements above:
- Mattermost – Trust Center (ISO 27001, SOC 2 and DPA) →
- Mattermost – GitHub repo (open source that can be self-hosted) →
- Mattermost – Documentation: Cloud data residency (where cloud data is stored) →