Mattermost review
Top open-source platform for teams needing total data control.
Top 11 rank
#6 of 11
Score
8/9.4
Pricing
$$ ($10/user/mo)
HQ
Palo Alto, USA
Verdict
Mattermost is the leading choice for security-conscious organizations because its open-source, self-hosted model provides complete data control and customization.
What customers praise
It offers granular control over data residency and security protocols, meeting strict compliance standards like FedRAMP that most SaaS vendors cannot.
What customers criticise
The self-hosted nature requires significant technical resources for setup, maintenance, and scaling, making it less accessible for small teams without dedicated IT staff.
Best for
Organizations with high-security needs, such as government, finance, or healthcare, that require a self-hosted, open-source platform.
At a glance
- Integrations: GitHub, Jira, Jenkins, GitLab, Zapier
- Compliance: GDPR, HIPAA-ready, FINRA-ready
- Regions served: Self-hosted
- Typical onboarding: 7 days
- Free tier: yes
Red flags
Public risk signals as of June 2026: none. No material public risk signals as of 2026-06-17. See the full red-flag report.
Alternatives
See alternatives to Mattermost, or compare against the next-ranked entry: Mattermost vs Flock.
Source: Top 11 The 11 Best Team Communication Tools, verified June 17, 2026 — no paid placement.