Mattermost vs Slack
Side-by-side from the Top 11 ranking of The 11 Best Team Communication Tools (2026). Last verified June 17, 2026.
The short answer
Slack ranks higher on Top 11 (#1 vs #6) for Remote and hybrid teams choosing a messaging and collaboration platform. The best overall tool thanks to its unmatched app integrations and intuitive design.
At a glance
| Mattermost | Slack | |
|---|---|---|
| Top 11 rank | #6 / The 11 Best Team Communication Tools (2026) | #1 / The 11 Best Team Communication Tools (2026) |
| Score (out of 9.4) | 8 | 9.2 |
| Best for | High-security and self-hosted needs | Teams needing deep app integrations |
| Pricing | $$ ($10/user/mo) | $$ ($8 to $15/user/mo) |
| HQ | Palo Alto, USA | San Francisco, USA |
| Founded | 2016 | 2009 |
Mattermost
Top open-source platform for teams needing total data control.
mattermost.comSee full entry in The 11 Best Team Communication Tools (2026)
Slack
The best overall tool thanks to its unmatched app integrations and intuitive design.
slack.comSee full entry in The 11 Best Team Communication Tools (2026)
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.