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OTP Auth

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

18 Alternatives To OTP Auth

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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.
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FreeOTP

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

Invantive Authenticator

Invantive Authenticator is a two-step verification solution for use with TOTP-protected websites…

Nitrokey

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

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.

QuickAuth

Get your one time codes from your Pebble!

TOTP Authenticator

TOTP Authenticator app makes it easier to setup and manage your 2-factor authentication accounts and tokens. The app allows you to add extra security to your accounts and protects them from hijacking.
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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+