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Authenticator vs OTPClient: catalog facts
Authenticator	OTPClient
Free Free and open source under the GPL 3.0 or later.	Free Free and open source under the GPL-3.0 license.
Linux	Linux, Command line
Supports both TOTP and HOTP codes Fits in with the GNOME desktop	Multiple encrypted token databases Supports TOTP, HOTP and Steam Guard codes
Built for Linux desktops only Codes live on the desktop rather than on a phone you carry	Desktop Linux only, no mobile app Handles one-time codes only, not passwords
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
Not stated if an account is needed	No account 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 24, 2026

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