Where was this recorded?
A small plane flying past makes a Doppler curve. Match it against public ADS-B tracks and the curve pins down where the mic was. Audio never leaves your browser.
The location comes only from the sound. No GPS, no browser location prompt, no IP lookup, no cookies, no analytics.
Try an example
Each example comes with its own slice of the flight index: every low propeller flight on Earth from 11:36 to 11:48 CEST on 18 Jul 2025 (1,147 flights). The page gets only the sound. Not the place, not the time. Press Locate, or play it out loud and use Start recording to test your mic.
Two small planes over English farmland
5 minutes of what a microphone in a field would have heard: two propeller aircraft passing about 4 minutes apart. The audio is synthesized from their real ADS-B tracks, because no public recording has two planes and an exact known spot.
Birdsong on a Dutch heath
2 minutes recorded for its birds and cows on Kampina heath, Netherlands, 16 km from the nearest airport. A small plane hums past in the background around 0:39. With one plane the sound narrows the world to a shortlist, not a single spot.
"prop plane birds fens Kampina Netherlands 1140 am 250718_1173" by klankbeeld, CC BY 4.0.
Record with your microphone
Go outside or open a window. Record at least 90 s while a propeller plane passes. Voice processing is turned off so low hum survives.
Or analyze an audio / video file
Pick the part of the clip where the plane passes, e.g. a movie scene. Every indexed day is searched, newest first.
Detections
ADS-B data: adsb.lol (ODbL). Terrain: AWS Terrain Tiles. Inspired by colsto's video.