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PumbleMattermost
Freemium

Free with unlimited users and message history; paid plans are sold for businesses.

 Freemium

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

Windows, macOS, Linux, Android, iOS Windows, macOS, Linux
  • Unlimited users and message history on the free offering
  • Channels, threads, calls and recording in one app
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Hosted service only, with no self-hosting option
  • Closed source
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
Downloadable app, Hosted service Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Account needed Account needed
Not stated if it works offline Needs internet

Checked September 24, 2026

Checked September 21, 2026

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