How far away was that lightning?
Lightning Counter answers it in seconds. Point your phone at the storm — the
camera catches the flash, the microphone hears the thunder, and the app times the
gap with high precision to tell you exactly how far the strike was, in km or miles.
It's the classic "count the seconds between flash and bang," done properly:
precise timing, temperature‑adjusted speed of sound, and a clean, glanceable design.
WATCH A STORM ROLL IN — OR AWAY
• Automatic detection: a flash starts the timer, the thunder stops it.
• Manual triggers too, for when a strike is just out of frame.
• See how fast the storm is closing in, and roughly when it will be within 1 km.
• Every strike is saved and grouped into storms, with a distance‑over‑time graph
so you can see at a glance whether the storm is approaching or receding.
KNOW WHEN IT'S SAFE
• Every strike is rated: very close, within striking range (about 10 km), or at a
distance.
• A full‑screen close‑strike alert (with a strong haptic and a notification) when a
strike lands within your chosen distance — 1 km by default, adjustable.
• An all‑clear countdown: 30 minutes after the last strike you recorded, a reminder
that the usual wait is over.
HANDS‑FREE
• Flash and Thunder buttons right on the Lock Screen — no unlocking.
• Put "Lightning Timer" on the Action Button: press at the flash, press again at
the thunder.
• "Start a storm watch" with Siri, or from Shortcuts and Spotlight.
• A Live Activity keeps the count, the last distance and the all‑clear countdown on
your Lock Screen and in the Dynamic Island.
STORM MAP
• A ring for each strike at its real distance, drawn where you measured it. As the
rings shrink toward you, the storm is closing in.
• Replay any past storm on the map, right where it happened.
• Trigger and measure right from the map and watch the rings update.
BUILT FOR THE MOMENT
• Immersive "live" storm mode — prop the phone up and let it capture strike after
strike.
• Front or back camera (lay it on a table, screen up).
• Calibrate light and sound sensitivity with live meters.
• Share any storm as an image.
PRIVATE BY DESIGN
• Everything happens on your device. The camera and microphone are analyzed in real
time and never recorded. Your location and strike history never leave your phone.
A note on safety: Lightning is dangerous. Lightning Counter is an informational tool,
not a life‑safety device — if you can hear thunder, you're within range. Seek shelter.
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