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Altus vs ZapZap: catalog facts
Altus	ZapZap
Free Free and open source under GPL-3.0.	Free Free and open source under the GPL-3.0-or-later licence.
Windows	Linux
Multiple WhatsApp accounts in one app Custom themes for the WhatsApp interface	Multiple WhatsApp accounts in one app Native desktop notifications
Unofficial client that depends on WhatsApp Web Electron app with higher memory use than a native client	Unofficial client that depends on WhatsApp's web service Requires a WhatsApp account on a phone
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.