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OTPClient vs Yubico Authenticator: catalog facts
OTPClient	Yubico Authenticator
Free Free and open source under the GPL-3.0 license.	Free The app is free; it requires a YubiKey, which is bought separately.
Linux, Command line	Windows, macOS, Linux, Android, iOS
Multiple encrypted token databases Supports TOTP, HOTP and Steam Guard codes	Secrets stay on the hardware key rather than the device Same codes available on any machine where the key is plugged in
Desktop Linux only, no mobile app Handles one-time codes only, not passwords	Requires a YubiKey Losing the key loses access to the stored codes unless you have a backup
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
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.