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Singlebox vs Franz: catalog facts
Singlebox	Franz
Freemium Free to download, with paid WebCatalog plans available.	Freemium Free to download; the homepage does not detail paid plans.
Windows, macOS	Windows, macOS, Linux
Multiple accounts of the same service side by side Isolated sessions per account	Many messengers and email accounts in one window Native Signal support
Wraps web apps rather than native clients No Linux version of Singlebox mentioned	Pricing for paid features is not clearly stated on the homepage Runs web versions of services, so behaviour depends on each service
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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 1, 2026

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