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Authenticator vs OATH Toolkit: catalog facts
Authenticator	OATH Toolkit
Free Free and open source under the GPL 3.0 or later.	Free Free software; tools use GPL-3.0-or-later and libraries use LGPL-2.1-or-later.
Linux	Command line
Supports both TOTP and HOTP codes Fits in with the GNOME desktop	Generates and validates HOTP and TOTP codes Includes tools for managing PSKC data
Built for Linux desktops only Codes live on the desktop rather than on a phone you carry	The tools use GPLv3-or-later and the libraries use LGPLv2-or-later.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later AND LGPL-2.1-or-later
Not stated if an account is 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 October 8, 2026

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