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MattermostWire
Freemium

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

 Freemium

A limited free personal tier is available. Business plans are paid.

Windows, macOS, Linux Windows, macOS, Linux, Android, iOS, Web
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Encrypted group calls and guest rooms aimed at organisations
  • Clients are open source and the server can be self-hosted
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
  • The free personal tier is limited and the focus is on paid business plans
  • Requires an account tied to an email address or phone number
Downloadable app Downloadable app, Hosted service
Open source Open source
License: Apache-2.0 License: GPL-3.0
Account needed Account 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.