> ## Documentation Index
> Fetch the complete documentation index at: https://help.mytruv.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Setting Up Face ID or Touch ID

> Use biometric authentication to lock MyTruv on your iOS device.

<Note>Biometric authentication is currently available on iOS. The web app uses your Auth0 session - sign out from Settings when you're done on a shared computer.</Note>

Biometric authentication lets you unlock MyTruv quickly using your face or fingerprint instead of typing a PIN.

## How to enable biometric authentication

1. Open MyTruv and go to **Settings → Security & Privacy**.
2. Toggle on **Lock with Face ID** (or **Touch ID** / **Optic ID**, depending on your device).
3. Confirm with the system biometric prompt to activate.

MyTruv uses whatever biometric method your device offers. Make sure it's already set up in your device's system Settings; MyTruv reuses the same biometric registration.

## When you'll be prompted

The app locks after a period of inactivity - the timeout is configurable in [App Lock Settings](/security/app-lock-settings). When you return after the timeout, the lock screen shows an **Unlock** button that triggers biometric authentication. Returning to the app within the timeout window doesn't prompt re-auth.

## Biometric and PIN are mutually exclusive

You can use biometric authentication **or** a PIN, but not both at the same time. Enabling biometric replaces an existing PIN as the active method, and setting a PIN disables biometric. To switch, toggle the one you want in Security & Privacy.

## If you can't authenticate

The lock screen always offers a **Log out** button below the unlock control. Tapping it signs you out of MyTruv; signing back in re-engages the same lock the next time the app sits idle past the timeout. Use Log out if you can't authenticate and want to start fresh.

## Related

* [Using a PIN](/security/using-a-pin) - the alternative authentication method
* [App Lock Settings](/security/app-lock-settings) - configure the inactivity timeout

<Tip>If your device supports biometric authentication, it's the fastest way to unlock MyTruv.</Tip>