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OTPClient vs Flauth: catalog facts
OTPClient	Flauth
Free Free and open source under the GPL-3.0 license.	Free Free and open source under the MIT licence.
Linux, Command line	Windows, macOS, Linux, Android, Command line
Multiple encrypted token databases Supports TOTP, HOTP and Steam Guard codes	Same authenticator on Android and all three desktop systems Command-line tool for reading codes in a terminal
Desktop Linux only, no mobile app Handles one-time codes only, not passwords	Small, young project with a single main developer No iOS app listed among the downloads
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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