What is Face ID in an app?
Face ID is Apple's face recognition for iPhone and iPad. Besides unlocking the phone, apps can use it, through Apple's LocalAuthentication framework, to confirm it's really you before they show something private. The app only learns whether the check passed; the face data itself never leaves the device's Secure Enclave.
More about Face ID
An app has to say why it wants Face ID, and iOS asks the person's permission the first time. Apps usually fall back to the device passcode when Face ID isn't set up or doesn't recognise the face.
Face ID with Borel
Describe an app that opens with Face ID, and Borel builds it in Swift with Apple's LocalAuthentication, with the passcode as a backup. The app unlocks with a glance on your iPhone.
Related terms
Make your iPhone app in Borel
Describe it in your own words. Borel writes it in Swift, builds it on its own Mac and puts it on your iPhone.