Mattermost review

Mattermost is built for organizations where data control matters more than convenience. It offers channel-based messaging, threads, file sharing, group calls and screen sharing, and it is deployed on your own infrastructure, up to fully air-gapped environments on Enterprise Advanced. Integrations are developer-oriented: a REST API, an MCP server, webhooks, slash commands and a plugin platform, plus bring-your-own and multi-LLM AI integration with an agent control plane. Professional covers channel and multi-team collaboration with single sign-on and AD/LDAP sync, while Enterprise adds compliance, high availability, workflow automation and federated communications. Small teams can start with Mattermost Entry, a free mode that the vendor says suits teams of fewer than 50 users, or the MIT-licensed Team Edition. Paid plan prices are not listed publicly, so pricing here is pending. The cost of control is effort: someone has to run, update and secure the servers, and the experience is less polished for nontechnical staff.

Who it is for

Engineering, security and public sector teams that need to host chat on their own infrastructure.

Price

Free edition for evaluation; Professional, Enterprise and Enterprise Advanced priced through sales.

Professional Channel-centric for team collaboration Contact Sales
Quoted from the vendor pricing page on November 6, 2026.

Key features

• Public and private channels, threads and file sharing
• Group calling and screen sharing
• REST API, MCP server, webhooks and slash commands
• Bring-your-own and multi-LLM AI integration
• Air-gapped deployment on Enterprise Advanced

Strengths and weaknesses

• Strength: You control where your data lives, including fully offline setups
• Strength: Strong DevOps and operational integrations
• Strength: Free Entry and open source Team Edition for small teams
• Weakness: Paid plans are priced through sales
• Weakness: Self-hosting requires your own server administration
• Weakness: Entry is best suited to teams of fewer than 50 users

Key facts

• Free option: Mattermost Entry and open source Team Edition
• Paid plans: Professional, Enterprise, Enterprise Advanced
• Deployment: Self-hosted, including air-gapped

Where it ranks

Mattermost is No. 9 in our Best Team Chat Apps verdict.