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Rocket.Chat DesktopMattermost
Free

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

 Freemium

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

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

Checked September 22, 2026

Checked September 21, 2026

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