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

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