Overview

Mattermost was founded by Ian Tien and Corey Hulen in 2014 in Palo Alto, California, operating with a remote-first work model. It is an open-source self-hosted team collaboration platform widely regarded as an open-source alternative to Slack. The platform provides channels, direct messages, file sharing, search and integrations, with the core value of keeping data entirely under your own control.

Mattermost is adopted by organizations including NATO, the US Department of Defense (DoD) and the World Economic Forum (WEF), validating its reliability in high-security, high-compliance scenarios. The free open-source Team Edition supports unlimited users with 10GB file storage and 90 days of message history; paid tiers add advanced permissions, compliance exports and AD/LDAP integration. The official plugin marketplace offers 1000+ apps alongside the Copilot AI assistant. See Remote Team Management Tool Comparison for more.

Key Strengths

  • Full data control: after private deployment, data lives on your own servers, meeting hard data-sovereignty requirements in government and finance; see Data Compliance Checklist.
  • Open source with unlimited users: the Team Edition is free and open source with no user limits, giving lower long-term TCO than per-seat commercial platforms.
  • Enterprise security and compliance: supports SSO/SAML, AD/LDAP, multi-factor authentication, compliance exports and eDiscovery for high-security needs.
  • Deep DevOps integrations: a plugin marketplace of 1000+ apps with native connectors for Jira, GitLab, Jenkins, Prometheus and more, ideal for engineering teams.
  • Incident response built in: Playbooks (incident response runbooks) and Boards (kanban) bring alerts, task assignment and post-incident reviews into one platform.

Product Ecosystem

Mattermost Team Edition

The free open-source edition with channel messaging, file sharing, search and basic integrations, for teams that want zero-cost private deployment.

Mattermost Enterprise (E10/E20)

Enterprise editions with advanced permissions, compliance exports, AD/LDAP, guest accounts and eDiscovery for security-critical organizations.

Mattermost Cloud

A cloud-hosted version that removes self-maintenance overhead and provides enterprise SLA guarantees for teams that prefer not to self-host.

Mattermost Boards

A built-in kanban tool for task management and visual workflows, similar to Trello, deployable together with the platform.

Mattermost Playbooks

Incident response runbooks with automated alerts, task assignment and post-incident reviews for DevOps and on-call teams.

Plugin Marketplace & Copilot

1000+ third-party plugins covering CI/CD, monitoring and AI; Copilot AI provides meeting summaries, translation and smart replies.

Limitations

  • Self-hosting operations burden: deployment, upgrades, backups and monitoring fall on your team, so IT staffing costs cannot be ignored, see Remote Team Toolchain.
  • Interface less polished than commercial products: UI and interaction details trail Slack, and new users need a period of adaptation.
  • Advanced features in paid tiers: cloud hosting, Copilot AI and some compliance features require Professional/Enterprise, while the free version must be self-maintained.
  • Smaller ecosystem: third-party apps and support scale are smaller than commercial platforms, so deep integrations often need self-configuration.

Use Cases

  • Government and defense organizations (Recommended ★★★★★): full data control plus compliance exports, exemplified by NATO and the US Department of Defense.
  • Finance and healthcare compliance industries (Recommended ★★★★★): private deployment meets data residency and audit requirements; see GDPR Compliance Checklist.
  • DevOps engineering teams (Recommended ★★★★★): native Jira, GitLab, Jenkins and Prometheus integrations, with Playbooks for alert handling.
  • Open-source and self-hosting teams (Recommended ★★★★★): zero licensing cost with unlimited users for low long-term spend.
  • Small teams wanting out-of-the-box use (Recommended ★★★): consider Mattermost Cloud, or commercial options such as Slack.

Pricing

Edition Price Description
Team Edition (self-hosted) $0 Unlimited users, 10GB file storage, 90 days of message history, free and open source
Professional (self-hosted/cloud) $10/user/month (annual) Advanced permissions, AD/LDAP, multi-factor authentication, basic Copilot capabilities
Enterprise $24/user/month (annual) Compliance exports, eDiscovery, advanced security and dedicated support

Note: public reference prices for Mattermost (2026-08); cloud and self-hosted pricing differ slightly, so check the official website for current details.

FAQ

  • How is Mattermost different from Slack? Mattermost is an open-source self-hosted platform where you fully control the data, ideal for security- and compliance-sensitive organizations; Slack is a cloud-hosted commercial product that is easy to use but stores data with a third party. Compare at Team Communication Platform Comparison.

  • How large a team can the free edition support? The Team Edition is free with no user limit, including 10GB file storage and 90 days of message history, sufficient for small and medium teams; upgrade to Professional for larger scale; see team communication tools comparison.

  • What do I need to deploy Mattermost? A server (or cloud host) plus a domain is enough; official Docker and Kubernetes deployment options are provided, or use Mattermost Cloud to avoid maintenance; see Docker deployment beginners guide.

  • Can Mattermost integrate with Jira, GitLab and other tools? Yes. Mattermost offers native integrations and 1000+ plugins covering CI/CD, monitoring and AI, well suited to engineering automation workflows; see CI/CD pipeline setup.

  • How is data security ensured? Private deployment, SSO/SAML, AD/LDAP, multi-factor authentication and compliance exports are supported; adoption by NATO and the US Department of Defense confirms high-security readiness; see system security hardening.