Develop - Open source - header 2 shadow

Open Source Software

We offer our software as open source to help the YubiKey community develop compelling applications

Get a YubiKey

Web API Clients

Implementations of web service API for authentication to the YubiCloud or to implement your own validation server.

Validation Server

Resources to allow users to host their own YubiKey validation server.

Low-Level Library

Free software libraries for the decryption and parsing of YubiKey One-Time Passwords.

Personalization Libraries

Libraries for the development and programming of YubiKeys.

ModHex Calculator

The ModHex Calculator converts values between different data encoding formats.


YubiX is a stack of YubiKey related software for quick deployment and/or as the basis for a custom solution.

Source Code

Yubico’s published projects on GitHub. Please note that not all projects are available via GitHub