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iamb vs Quaternion: catalog facts
iamb	Quaternion
Free Free and open source under the Apache-2.0 licence.	Free Free and open source.
Command line	Windows, macOS, Linux
Vim keybindings throughout End-to-end encryption, threads and spaces	Native Qt interface instead of a web wrapper Works with any Matrix homeserver
Terminal only, no graphical interface Still pre-1.0 releases	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: Apache-2.0	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.