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Fluxer vs Spacebar: catalog facts
Fluxer	Spacebar
Free Free and open source under the AGPL-3.0.	Free Free and open source, funded through Open Collective donations.
Linux, Android, Web, Self-hosted	Self-hosted
Text, voice, video and screen sharing in one app Can be self-hosted with data kept on your server	Aims for compatibility with the Discord client and API Runs on a server you control
Desktop app support for self-hosted servers is still coming Younger and smaller than established chat platforms	Still a reimplementation in progress, so compatibility may be incomplete Requires running and maintaining your own server
Downloadable app, Web application, Self-hosted, Hosted service	Self-hosted
Open source	Open source
License: AGPL-3.0-or-later	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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