OpenSK is described as 'Open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards' and is an app in the development category. There are more than 10 alternatives to OpenSK for a variety of platforms, including Android, iPhone, iPad, Linux and Mac apps. The best OpenSK alternative is 2FA Authenticator (2FAS), which is both free and Open Source. Other great apps like OpenSK are Google Authenticator, Nitrokey, YubiKey and Keysmith.
2FAS Authenticator is a simple and free application for Two Factor Authentication (2FA Authentication) which generates Time-based One-time Passwords (TOTP) and PUSH authentication*.
United States
Google Authenticator generates 2-Step Verification codes on your phone.
United States
Provides robust USB-based encryption, digital signing, and secure login with hardware-level secret key storage, user-defined PIN, tamper-proof smart card, open source design, email and data encryption compatibility, virus protection, and multi-platform support.
Germany
EU
The multi-protocol security key offers the highest assurance, protecting devices with passwordless workflows and strong 2FA against phishing. It plugs into computers, tablets, and mobile devices, integrates PIN or biometric for identity verification, and reduces helpdesk costs.
SwedenEU
Keysmith is a token generator for your two-factor authentication (2FA) logins. It supports time and hash-based one-time passwords (TOTP/HOTP).
GermanyEU
OTP authenticator app for managing your 2FA / OTP codes on iPhone, iPad, Mac and Apple Watch.
Australia
United States
Secure your Zoho Account with easy-to-use, multi-factor authentication. Because hackers won't give you a second chance.
India
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.
United States
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.
United States
A simple application for multi-factor authentication, written in HTML using jQuery Mobile, jsSHA, LocalStorage and Application Cache. It implements the TOTP (Time-Based One-Time Password) algorithm according to RFC6238 and has been tested to work with Google Authenticator...
