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Review · Software & AI

Mattermost review

Self-hosted collaboration platform for engineering, security and operations teams, with free and commercial editions.

By the Comredix review desk · Updated November 14, 2026

Quality (40%)
8.6
Experience (25%)
7.0
Value (35%)
7.6

Mattermost is the Slack alternative for organizations that cannot put chat on someone else's cloud, such as defense suppliers, security teams and regulated enterprises. Its documentation describes Mattermost Entry as a free self-hosted edition best suited for teams of less than 50 users, and Team Edition as a free, open source, MIT licensed platform deployed as a single Linux binary with PostgreSQL. The pricing page lists Professional for up to 250 users with SSO through SAML, OIDC and OAuth, AD/LDAP sync, self-hosted group audio calls and screen sharing, guest accounts, 20 languages, Jira, GitHub and GitLab integrations and next business day support. Enterprise adds playbooks, data retention, legal hold, compliance export, FIPS 140-3 validated images and HA clusters up to 50,000 users with 24x7 support. Every paid plan is sold through sales, so we could not verify a price. Expect to run your own servers, which makes it harder to set up than a hosted app.

Who it is for

security-focused and regulated teams that must self-host

Price

Free self-hosted Entry and Team Edition; paid plans via sales (USD price not published).

US price check pending. See the vendor pricing page.

Key features

  • Self-hosted deployment so data stays on your own infrastructure
  • Professional adds SSO with SAML, OIDC and OAuth, and AD/LDAP sync
  • Self-hosted group audio calls and screen sharing on Professional
  • Jira, GitHub and GitLab integrations
  • Enterprise supports HA clusters up to 50,000 users

Strengths and weaknesses

  • Strength: Mattermost Entry is a free self-hosted edition
  • Strength: Team Edition is free, open source and MIT licensed
  • Strength: Enterprise lists compliance export, legal hold and FIPS 140-3 validated images
  • Weakness: Paid plans are sold through sales with no public price
  • Weakness: Mattermost says Entry is best suited for teams of less than 50 users
  • Weakness: Professional covers up to 250 users

Key facts

  • Free editions: Mattermost Entry and Team Edition, self-hosted
  • Professional: Up to 250 users, contact sales
  • Enterprise scale: HA cluster to 50,000 users
  • Languages: 20

Where it ranks

Mattermost is No. 8 in our Best Slack Alternatives verdict.

Alternatives we scored

Visit mattermost.com · Questions or corrections: editorial@comredix.com