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Quaternion vs Ement.el: catalog facts
Quaternion	Ement.el
Free Free and open source.	Free Free and open source under the GPL-3.0.
Windows, macOS, Linux	Windows, macOS, Linux
Native Qt interface instead of a web wrapper Works with any Matrix homeserver	Matrix chat without leaving Emacs Uses Emacs buffers and keybindings
Smaller project than the major Matrix clients such as Element Development pace is slower than larger clients	Requires GNU Emacs and some familiarity with it Text-focused, with no standalone interface
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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