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Franz vs Singlebox: catalog facts
Franz	Singlebox
Freemium Free to download; the homepage does not detail paid plans.	Freemium Free to download, with paid WebCatalog plans available.
Windows, macOS, Linux	Windows, macOS
Many messengers and email accounts in one window Native Signal support	Multiple accounts of the same service side by side Isolated sessions per account
Pricing for paid features is not clearly stated on the homepage Runs web versions of services, so behaviour depends on each service	Wraps web apps rather than native clients No Linux version of Singlebox mentioned
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 1, 2026	Official website Full listing and sources Checked October 2, 2026

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