Yandex.Key

Two-factor authentication app for Yandex accounts and also other QR-code based 2FA

18 Alternatives To Yandex.Key

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Authenticator

Authenticator is a simple, free, and open source two-factor authentication app.

Authenticator Plus

Authenticator Plus generates 2-step verification codes and lets you synchronize your accounts.
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Authy

Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.

Duo Security

Duo Security provides cloud-based two-factor authentication. Duo’s technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.
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FreeOTP

Open source implementation of the two-factor authentication HOTP and TOTP schemes.
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Google Titan

A 2FA device to protect yourself from hackers

LifeLock

LifeLock is an identity theft protection solution that protects its members’ personal information from being used by a third party.

Nitrokey

Email Encryption. Encrypt your emails with GnuPG, OpenPGP, S/MIME or your favourite email client.
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OTP Auth

The app for calculating one-time-passwords on iPhone and iPad.

OTPClient

GTK+ application for securely managing TOTP & HOTP tokens.

Obsidian - Elegant OTP Authenticator

Obsidian is an elegant OTP Authenticator app for both iOS and MacOS.

Open Authenticator

A trusted open-source Authenticator. Formerly known as SmartWatch2 Authenticator free.

SoloKeys

Secure login made open and easy 🔒

TeleSign

TeleSign offers end-to-end communications Platform as a Service.
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Twilio

Brings voice and messaging to your web and mobile applications.
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UNLOQ

UNLOQ offers Multi-Factor Authentication, Transaction authorization, and Data Encryption solutions for Businesses and Organisations.
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YubiKey

The YubiKey is a one-time password device for secure login with two-factor authentication
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andOTP

andOTP is a two-factor authentication App for Android 4.4+