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Strongbox vs Kee: catalog facts
Strongbox	Kee
Freemium Available through the App Store, with paid features on top of the free app.	Freemium Version 2 is free on Android and iOS; the developer also offers a subscription.
macOS, iOS, Browser extension	Android, iOS, Web, Browser extension
Uses standard KeePass files with no lock-in Sync through cloud storage, WebDAV or SFTP	Browser auto-fill for KeePass-format password stores Argon2 vault protection and open source code
Apple platforms only Many settings to understand for new users	Two app versions with different features can be confusing Licence for the source code is not stated on the homepage
Downloadable app, Browser extension	Downloadable app, Web application, Browser extension
Closed source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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