YubiKey is described as 'A multi-protocol, highest assurance security key offering passwordless workflows and strongest 2FA against phishing, protecting devices efficiently' and is a Authenticator in the security & privacy category. There are more than 25 alternatives to YubiKey for a variety of platforms, including Android, iPhone, iPad, Linux and Mac apps. The best YubiKey alternative is Nitrokey. It's not free, so if you're looking for a free alternative, you could try 2FA Authenticator (2FAS) or Authy. Other great apps like YubiKey are OnlyKey, andOTP, OVault and Microsoft Authenticator.
An awesome two-factor authenticator based on Flutter, supports Android, Windows and Linux platforms, and supports multiple cloud backup methods such as Onedrive, Dropbox, WebDAV, S3Cloud, etc.
GTK+ application for securely managing TOTP & HOTP tokens. Content is encrypted on disk using AES256-GCM. Master password derived using PBKDF2 with 100k iterations & SHA512 as hash algorithm. Can import encrypted backups from andOTP & Authenticator+.
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This is not a hardware key, so it can't be compared to YubiKey.
Two-factor authentication app for Yandex accounts and also other QR-code based temporary codes for two-factor authentication
This is not a hardware key, so it can't be compared to YubiKey.
Google Titan Security Keys offer two-factor authentication to prevent phishing and man-in-the-middle attacks. They support FIDO standards and come in USB-A, USB-C, and Bluetooth formats, ensuring compatibility with various devices and services.
Location-based behavioral biometrics SDK and APIs for frictionless mobile identification verification and authentication.
Krypton implements the standardized FIDO Universal 2nd Factor (U2F) protocol to provide secure, un-phishable two-factor authentication on the web, using just your phone.
It's not a Key, therefore can't be compared
Sentinel is an elegant OTP Authenticator app for both iOS and MacOS. It relies only on the Apple's iCloud Keychain to share data across devices.
This is not a hardware key, so it can't be compared to YubiKey.
This app is created for use with the YubiKey NFC and NEO to copy One-time-passwords (OTPs) from a YubiKey into the iOS clipboard.
Stop account takeovers, protect your employees and applications, and eliminate passwords with DIGIPASS® FX7, a FIDO-enabled, phishing-resistant authenticator. DIGIPASS FX7 enhances security while simplifying the login process, enabling a ‘work from anywhere, anytime’ policy.
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It's not a Key, therefore can't be compared