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Altus vs Karere: catalog facts
Altus	Karere
Free Free and open source under GPL-3.0.	Free Free and open source under the GPL version 3 or later.
Windows	Linux
Multiple WhatsApp accounts in one app Custom themes for the WhatsApp interface	Several WhatsApp accounts in isolated sessions Native GTK4 window instead of a browser tab
Unofficial client that depends on WhatsApp Web Electron app with higher memory use than a native client	Unofficial client that depends on WhatsApp Web Requires a WhatsApp account
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
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 October 1, 2026

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