Secure login, open, easy.
Solo is the first, open source, security key supporting FIDO2. It lets you log in to your favorite sites with two-factor authentication without needing to install any software. It works on Mac OS X, Windows, Linux, Chrome OS, and on all major browsers with FIDO2, WebAuthn, or U2F support.
Solo implements the FIDO2 and U2F standards for the strongest two-factor authentication and greatest security. It protects against phishing by cryptographically signing the login hostname, unlike SMS codes and time-based tokens that can be replayed by a sophisticated attacker.