How far away was that lightning strike?
Flash-to-bang, done right. Tap when you see the flash and tap when you hear the thunder — or point the camera at the storm and let it measure hands-free. Temperature-adjusted speed of sound, strike log, and storm trend included.
⚡ Coming soon to Google PlayOne big glove-friendly button. Tap at the flash, tap at the thunder, get the distance. Works anywhere, day or night, no permissions needed.
The camera watches for the flash while the microphone listens for the thunder onset, then pairs them automatically. Best after dark — set the phone down and watch the storm.
Auto mode saves the exact camera frame that triggered detection — your lightning photo, plus a copy tagged with distance, time, and GPS location.
Consecutive strikes reveal whether the storm is approaching or moving away, how fast, and roughly when it will be overhead.
Every measurement is kept — distance, time, flash-to-bang, GPS pin — and exports as CSV whenever you want it.
All flash and thunder detection runs entirely on your phone. No account, no cloud, nothing uploaded — your camera and mic data never leave the device.
Strike Analyzer is free with ads. A one-time Pro purchase — no subscription — removes ads and unlocks your full strike history (everything you logged while free unlocks retroactively).
| Free | Pro (one-time) | |
|---|---|---|
| Manual & auto measurement | Full | Full |
| Bolt photos & storm trend | Full | Full |
| Strike log | Last 5 strikes | Complete history |
| Ads | Small banner | None |
Strike Analyzer is not a safety device. Flash-to-bang distances are estimates and can be wrong. Never use this app to decide whether it is safe to stay outdoors.
If you can hear thunder, you are close enough to be struck. Follow the National Weather Service guidance: When Thunder Roars, Go Indoors — and stay there until 30 minutes after the last thunder.