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Zulip vs Fluxer: catalog facts
Zulip	Fluxer
Freemium The server and clients are free and open source and can be self-hosted at no cost. Zulip…	Free Free and open source under the AGPL-3.0.
Windows, macOS, Linux, Android	Linux, Android, Web, Self-hosted
Topic-based threading inside channels, which makes catching up genuinely practical Self-hostable, or hosted, with free plans for open-source communities	Text, voice, video and screen sharing in one app Can be self-hosted with data kept on your server
The topic model takes getting used to and needs team discipline to work The desktop client shares most of its code with the web app, so it inherits its quirks	Desktop app support for self-hosted servers is still coming Younger and smaller than established chat platforms
Downloadable app	Downloadable app, Web application, Self-hosted, Hosted service
Open source	Open source
License: Apache-2.0	License: AGPL-3.0-or-later
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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