Compare software

OATH Toolkit vs Google Authenticator PAM module: catalog facts
OATH Toolkit	Google Authenticator PAM module
Free Free software; tools use GPL-3.0-or-later and libraries use LGPL-2.1-or-later.	Free Free and open source under the Apache-2.0 license.
Command line	Linux, Command line
Generates and validates HOTP and TOTP codes Includes tools for managing PSKC data	Supports HOTP and TOTP Works with PAM logins such as SSH and OpenVPN
The tools use GPLv3-or-later and the libraries use LGPLv2-or-later.	Requires configuration in the system's PAM setup.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later AND LGPL-2.1-or-later	License: Apache-2.0
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 October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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