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Altus vs Singlebox: catalog facts
Altus	Singlebox
Free Free and open source under GPL-3.0.	Freemium Free to download, with paid WebCatalog plans available.
Windows	Windows, macOS
Multiple WhatsApp accounts in one app Custom themes for the WhatsApp interface	Multiple accounts of the same service side by side Isolated sessions per account
Unofficial client that depends on WhatsApp Web Electron app with higher memory use than a native client	Wraps web apps rather than native clients No Linux version of Singlebox mentioned
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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