Yubico Authenticator — #4 Alternative to Authy
Hardware-isolated TOTP codes stored inside a physical YubiKey instead of phone storage
Yubico Authenticator stores OATH-TOTP credentials directly on tamper-resistant YubiKey silicon, generating 6-digit codes over USB-C or NFC across desktop and mobile only when physically touched.
License: Apache-2.0 · Pricing: Free & Open Source · Compare all Authy alternatives · Official Website