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ZapZap vs Altus: catalog facts
ZapZap	Altus
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under GPL-3.0.
Linux	Windows
Multiple WhatsApp accounts in one app Native desktop notifications	Multiple WhatsApp accounts in one app Custom themes for the WhatsApp interface
Unofficial client that depends on WhatsApp's web service Requires a WhatsApp account on a phone	Unofficial client that depends on WhatsApp Web Electron app with higher memory use than a native client
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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