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Fluxer vs Mattermost: catalog facts
Fluxer	Mattermost
Free Free and open source under the AGPL-3.0.	Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…
Linux, Android, Web, Self-hosted	Windows, macOS, Linux
Text, voice, video and screen sharing in one app Can be self-hosted with data kept on your server	The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances
Desktop app support for self-hosted servers is still coming Younger and smaller than established chat platforms	Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client
Downloadable app, Web application, Self-hosted, Hosted service	Downloadable app
Open source	Open source
License: AGPL-3.0-or-later	License: Apache-2.0
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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