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

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