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Slack vs Mattermost
Our conclusion: Mattermost wins on overall score (3,8 vs 3,3). Choose Mattermost for technically skilled teams that want to self-host a Slack-like chat on their own EU servers. Choose Slack for teams that want smooth channel-based chat with the market’s largest integration offering
 Slack |  Mattermost | |
|---|---|---|
| Our rating | 3,3 Good | 3,8 Good |
| Origin | Outside EU | Outside EU |
| EU data storage | Enterprise/Business plan only | No |
| Price | Freemium | Freemium |
| Ease of use | 4,7 | 3,0 |
| Price & value | 3,0 | 4,0 |
| Local support | 1,0 | 4,0 |
| Features | 4,5 | 4,0 |
| Certifications | ISO 27001, ISO 27017, ISO 27018, SOC 2 | ISO 27001, SOC 2 |
| Best for | Teams that want smooth channel-based chat with the market’s largest integration offering | Technically skilled teams that want to self-host a Slack-like chat on their own EU servers. |
Prices as of July 2026, rounded. Origin = the vendor's legal jurisdiction. Read the full reviews: Slack · Mattermost.
Would you rather have a European alternative? Alternatives to Slack → Alternatives to Mattermost →
Common questions
Which is best: Slack or Mattermost?
Our overall score gives Mattermost the edge (3,8 vs 3,3). But the right choice depends on your needs: Mattermost suits technically skilled teams that want to self-host a Slack-like chat on their own EU servers. while Slack suits teams that want smooth channel-based chat with the market’s largest integration offering
Which is the European choice?
Both have the same origin level (Outside EU). Compare EU data storage and certifications in the table instead.
How do Slack and Mattermost compare on price?
Slack: Freemium. Mattermost: Freemium. Prices as of July 2026; always check the current price list.
Comparison based on our verified data and editorial ratings, see How we review. Some links are affiliate links; ranking is never affected.