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OTPClient vs OATH Toolkit: catalog facts
OTPClient	OATH Toolkit
Free Free and open source under the GPL-3.0 license.	Free Free software; tools use GPL-3.0-or-later and libraries use LGPL-2.1-or-later.
Linux, Command line	Command line
Multiple encrypted token databases Supports TOTP, HOTP and Steam Guard codes	Generates and validates HOTP and TOTP codes Includes tools for managing PSKC data
Desktop Linux only, no mobile app Handles one-time codes only, not passwords	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	License: GPL-3.0-or-later AND LGPL-2.1-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 October 8, 2026

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