Torch

Browsers only let a page use the torch through the camera, so you'll be asked for camera access. Nothing is recorded or sent anywhere.

Test how quickly your torch responds

Screen

Keep the screen on while the app is open: checking

App

Installed. It works without a signal too.

To install, tap the Share button in Safari, then Add to Home Screen.

Installed, Light Fantastic opens full screen from your home screen and works without a signal.