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ZapZap vs WhatsApp: catalog facts
ZapZap	WhatsApp
Free Free and open source under the GPL-3.0-or-later licence.	Free Free to use for personal messaging and calls.
Linux	Windows, macOS, Android, iOS, Web
Multiple WhatsApp accounts in one app Native desktop notifications	End-to-end encrypted messages and calls Available on phones, desktop and the web
Unofficial client that depends on WhatsApp's web service Requires a WhatsApp account on a phone	Proprietary and tied to a phone number account Relies on a central service run by the developer
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
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 September 24, 2026

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