# Mattermost Mattermost is an open-source, self-hosted team messaging and collaboration platform. It is open source and self-hosted, installable on Docker Hub, Proxmox, Kubernetes (Helm), TrueNAS, Umbrel and Unraid. Canonical page: https://ourlocalhost.com/app/52/mattermost ## Description Mattermost is an open-source, self-hosted team messaging and collaboration platform. It provides channels, direct messages, file sharing, and administrative controls for private team communication. Home lab and small team users can deploy the Mattermost Team Edition server to run their own secure chat workspace. ## Platform availability Available on 8 of 9 platforms: Unraid, TrueNAS, Umbrel, Proxmox, Helm, Mac, Windows, Linux. ## Desktop and other devices Mac, Windows, Linux. ## Health score 74/100 (Good), based on 5 of 5 factors. - Maintained: 100 (last commit 22 days ago) - Popular: 67 (2,269 GitHub stars) - Easy to install: 100 (8 install platforms, install notes, setup guide, Docker image) - Light to run: 50 (2 GB minimum RAM) - Security check: 20 (1 serious finding, 9 minor, CI, tests, OpenSSF Scorecard 6.6/10) ## Security check 1 serious finding: Uses fast-xml-parser 5.3.3, which has a known critical vulnerability. Automated checks on commit 6dc7ac1, 23 Oct 2026. Not an audit. ## Links - GitHub: https://github.com/mattermost/mattermost - Docker Hub: https://hub.docker.com/r/mattermost/mattermost-team-edition/ - Proxmox: https://community-scripts.github.io/ProxmoxVE/scripts?id=mattermost - Kubernetes (Helm): https://artifacthub.io/packages/helm/phntom/mattermost - TrueNAS: https://apps.truenas.com/catalog/mattermost/ - Umbrel: https://apps.umbrel.com/app/mattermost - Unraid: https://ca.unraid.net/apps/mattermost-19eevl51ur51j1?q=mattermost - Official website: https://mattermost.com/ - desktop: https://github.com/mattermost/desktop/releases/latest - Documentation: https://docs.mattermost.com ## Common questions ### How do I create the settings file for a Mattermost container deployment? Run cp env.example .env before starting Mattermost. Without this .env settings file, the app may not have the configuration it needs to run. ### Why does Mattermost not appear in the browser after installing the GitLab Omnibus package? Run sudo systemctl start mattermost to start the service. If this step is skipped, the service is not running and the app will not be available in a browser. ### How do I add built-in video calls to Mattermost? Run mmctl plugin marketplace install jitsi to install the Jitsi plugin. This is optional, and without it the video-call feature will not be available. ### Can one Mattermost Desktop client access multiple self-hosted servers? Yes, the native desktop app includes a server dropdown for access to multiple servers. ### Is Mattermost Enterprise Edition intended for customer support deployments? It is not recommended for primarily providing customer service or customer support. It does not currently offer a licensing model or technical advice for that use case. ## Alternatives - Buzz: Buzz is a self-hosted workspace where humans and artificial intelligence (AI) agents collaborate in shared Nostr rooms. - Discord: A versatile platform for text and voice communication, featuring topic-specific channels, customizable moderation, and smooth low latency i… - Echoed: Lightweight chat platform for gamers and teams, offering low-latency voice and video, unlimited text channels, task management, and privacy… - Element: A secure collaboration app with end-to-end encryption and interoperability across web, desktop, and mobile. - Element X: It is the brand new, and fastest ever, Matrix client. - Matrix: Matrix is a free, open-source protocol and server for secure, decentralized real-time messaging. - Meshchat: A simple mesh network communications app powered by the Reticulum Network Stack. - Quiet Chat: Peer-to-peer group chat platform syncing messages over Tor and IPFS, ensuring private, encrypted, decentralized collaboration without any c… - Rakuten Viber: Secure messaging, free calls, group chats up to 250, emoji reactions, disappearing messages, low-cost international calls, rich media and c… - Rocket.Chat: Rocket.Chat is an open-source, self-hosted web chat server for company or community messaging, extensible for developers building custom ch… - Slack: Slack is a secure team messaging and collaboration platform, provided here as a Kasm container that gives you a private, dedicated workspac… - Spokes: Spokes is a self-hosted text, voice, and video chat platform for families, friend groups, and small teams that offers a private, fully-feat… --- Source: Our Local Host (https://ourlocalhost.com/app/52/mattermost), the self-hosted and open-source app directory.