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OTPClient vs 2FAS: catalog facts
OTPClient	2FAS
Free Free and open source under the GPL-3.0 license.	Free Free and open source. Some components are source-available.
Linux, Command line	Android, iOS, Browser extension
Multiple encrypted token databases Supports TOTP, HOTP and Steam Guard codes	Browser extension approves codes on the phone instead of typing them Encrypted backups to your own iCloud or Google Drive account
Desktop Linux only, no mobile app Handles one-time codes only, not passwords	Mobile-first; there is no standalone desktop app Push approval needs the browser extension installed on each machine
Downloadable app	Downloadable app, Browser extension
Open source	Open source
License: GPL-3.0	License not stated
No 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 September 24, 2026	Official website Full listing and sources Checked September 22, 2026

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