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Zero-TOTP vs Clockwork: catalog facts
Zero-TOTP	Clockwork
Free Free and open source under the GPL-3.0.	Free Free and open source under the MIT licence.
Web, Self-hosted	Android, Web
Zero-knowledge encryption of stored TOTP secrets Use the hosted service or self-host it	Android app has no internet permission at all Imports secrets, otpauth links, QR images and migration exports
iOS app still in development and CLI only planned Small project with a limited contributor base	No cloud sync or backup between devices Stores nothing by default, so secrets must be re-entered unless the vault is on
Web application, Self-hosted	Downloadable app, Web application
Open source	Open source
License: GPL-3.0	License: MIT
Account needed	No account needed
Not stated if it works offline	Works offline
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.