: Alex realized this series doesn't support the Yubico Authenticator app for generating six-digit codes on older sites—a potential dealbreaker. The Professional’s Powerhouse: YubiKey 5 Series

Next, Alex saw the . It's the "Swiss Army Knife" of keys. YubiKeys | Two-Factor Authentication for Secure Login

: Perfect if Alex only wants to secure personal accounts like Google, Facebook, and Twitter.

Alex first looked at the . It was affordable (around $29) and felt like the "gateway" key.