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Quaternion vs iamb: catalog facts
Quaternion	iamb
Free Free and open source.	Free Free and open source under the Apache-2.0 licence.
Windows, macOS, Linux	Command line
Native Qt interface instead of a web wrapper Works with any Matrix homeserver	Vim keybindings throughout End-to-end encryption, threads and spaces
Smaller project than the major Matrix clients such as Element Development pace is slower than larger clients	Terminal only, no graphical interface Still pre-1.0 releases
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
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 23, 2026

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