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MattermostRocket.Chat Desktop
Freemium

The desktop client is free and open source. The Mattermost server has a free self-hosted…

 Free

The open-source software is available without a license fee. Hosting, hardware and…

Windows, macOS, Linux Windows, macOS, Linux
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Provides desktop packages for Windows, macOS and Linux.
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
  • Workspace access and server licensing are separate from the desktop client.
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 License: MIT
Account needed Not stated if an account is needed
Needs internet Not stated if it works offline

Checked September 21, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.