Lightning Distance

This app measures how far away a thunderstorm is. It watches for a lightning flash through the camera and listens for the thunder through the microphone. The time between the two determines the distance.

Point the camera at the sky during a storm. When lightning flashes, the timer starts. When thunder arrives, it stops and shows the distance.

The app needs access to your camera and microphone to work. Both are used locally — nothing is sent anywhere.

📱 Install on Android
  1. Open this page in Chrome
  2. Tap the ⋮ menu (top right)
  3. Tap "Add to Home screen"
  4. Tap Install to confirm
🍎 Install on iPhone / iPad
  1. Open this page in Safari
  2. Tap the Share button ⎙ (bottom bar)
  3. Scroll down and tap "Add to Home Screen"
  4. Tap Add to confirm

⚡ Lightning Distance

0.0s

Tap Start to begin

–
–

20%
20f
30
20°C

Camera access was denied — using mic only. Tap the button above when you see lightning.
To re-enable camera: tap 🔒 in Chrome's address bar → Site settings → allow Camera.