A passkey lets a device you have set up sign you in with one tap — no code, no
password. On an iPhone or iPad that is Face ID; on a Mac it is Touch ID; on most
Android phones it is your fingerprint; on a laptop or desktop it is the PIN or
password you already use to unlock the computer.

Set it up in **Settings → Security → "Set up on this device"**, and repeat on
each device you use.

<Callout type="info">
  Your face, fingerprint, and PIN never leave your device. Tiny Solutions only
  learns that your device approved you.
</Callout>