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Fractal vs Quaternion: catalog facts
Fractal	Quaternion
Free Free and open source under the GPL-3.0 licence.	Free Free and open source.
Linux	Windows, macOS, Linux
Native GTK interface that fits GNOME Written in Rust	Native Qt interface instead of a web wrapper Works with any Matrix homeserver
Linux only Needs a Matrix account	Smaller project than the major Matrix clients such as Element Development pace is slower than larger clients
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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