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WhatsApp vs Altus: catalog facts
WhatsApp	Altus
Free Free to use for personal messaging and calls.	Free Free and open source under GPL-3.0.
Windows, macOS, Android, iOS, Web	Windows
End-to-end encrypted messages and calls Available on phones, desktop and the web	Multiple WhatsApp accounts in one app Custom themes for the WhatsApp interface
Proprietary and tied to a phone number account Relies on a central service run by the developer	Unofficial client that depends on WhatsApp Web Electron app with higher memory use than a native client
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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