For developers

Free and open source software to rapidly integrate YubiKey strong two-factor, multi-factor and passwordless authentication into your software or service.
Clay DeGruchy

YubiKey 5Ci for developers

Yubico SDK for iOS and Android

Do you have or are you currently developing an iOS or Android application and want to integrate strong authentication support for your application? Now you can with the YubiKey 5Ci, an industry-first dual connector security key with support for USB-C and Lightning. Join the Yubico Developer Program and become an early adopter of the YubiKey 5Ci.

Rapid integration of strong authentication

Open source code

Integrate the YubiKey with your service, it’s quick and easy. The YubiKey works seamlessly with Windows, MacOS, Linux, iOS, and Android devices. No extra software for your users to download or license.

Developer tools

Use our reference documentation and testing tools to rapidly enable one touch authentication for your users. The YubiKey supports FIDO, PIV-compatible Smart Card, One-time Passwords (OTP), and OpenPGP.

Own your secrets

Control your own cryptographic secrets. No passwords, keys, PINs or other secrets are shared with Yubico.

Developer program

The Yubico Developer Program provides resources for organizations implementing strong authentication. We offer free workshops, documentation, implementation guides, APIs and SDKs. Join our mailing list to get early access to resources for implementing the FIDO2, WebAuthn specification.

Works with YubiKey program

Join the Works with YubiKey program to have your products and services featured on the Works with YubiKey catalog. Participate in co-marketing activities that showcase your solution and promote the value of strong authentication.

Fido logo

Developer videos

Introduction: FIDO2 authentication – watch now

Core concepts: WebAuthn data flows, attestation, and passwordless – watch now

Technical overview: WebAuthn server validation – watch now

Featured solutions

Read about some of the recent and most popular YubiKey integrations.

1Password rolls out WebAuthn
Yubico and Microsoft Introduce Passwordless Login
LastPass leverages the Yubico Mobile SDK for iOS
Knowledge base

Get answers to commonly asked questions


Access our free and open source software tools.


Access user’s guides, configuration guides, and more for detailed instructions and technical information.