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Zero-TOTP vs 2FAS: catalog facts
Zero-TOTP	2FAS
Free Free and open source under the GPL-3.0.	Free Free and open source. Some components are source-available.
Web, Self-hosted	Android, iOS, Browser extension
Zero-knowledge encryption of stored TOTP secrets Use the hosted service or self-host it	Browser extension approves codes on the phone instead of typing them Encrypted backups to your own iCloud or Google Drive account
iOS app still in development and CLI only planned Small project with a limited contributor base	Mobile-first; there is no standalone desktop app Push approval needs the browser extension installed on each machine
Web application, Self-hosted	Downloadable app, Browser extension
Open source	Open source
License: GPL-3.0	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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