Turn your phone into a precision freefall instrument. Drop it, measure the distance, compete globally.
Start Measuring → Free · No download · Works in any browserYour phone's built-in accelerometer detects freefall — we calculate the exact distance using physics.
Hold your phone and release it onto a soft surface below. The moment it leaves your hand, Floop starts timing.
The DeviceMotion API reads your accelerometer in real time. During freefall, gravity reads near zero — that's the window we measure. Distance is calculated from the kinematic equation s = ½gt².
Your measured distance is logged to the global leaderboard instantly. Challenge friends, earn streaks, climb the ranks.
Precision measurement meets global competition.
Centimeter-accurate distance tracking using your phone's accelerometer and kinematic physics.
Every drop ranked worldwide. See where your distance stacks up against players everywhere.
Measure a drop every day to keep your streak alive. Miss a day and you start over.
Fresh leaderboard every week with rotating themes. New week, new shot at the record.
Send a challenge link, your friend drops on their phone, distances compared head-to-head.
Generate a screenshot-ready card after every drop. Show off your measured distance anywhere.
Real physics. Real measurement.
Every modern smartphone contains a MEMS accelerometer — a tiny chip that measures acceleration along three axes. Under normal conditions, it reads ~9.8 m/s² (Earth's gravitational pull). When your phone is in true freefall, that reading drops to near zero because both the phone and the sensor are falling together.
Floop monitors the accelerometer via the browser's DeviceMotion API. The moment it detects the near-zero reading, the freefall timer starts. When the phone lands and decelerates, the timer stops. That elapsed time — precise to milliseconds — feeds directly into the kinematic equation:
Where s is the fall distance in meters, g is 9.81 m/s² (standard gravity), and t is the freefall duration in seconds. A drop of 0.4 seconds, for example, calculates to roughly 78 centimeters. No guesswork — pure physics.
All of this runs inside your browser. No server processes the sensor data. Your phone is the instrument, and the math is simple enough to run in real time on any modern device.
No download. No account. Open, drop, measure.
Measure Your First Drop → Free forever · Works on iOS, Android & desktopHow accurate is the freefall distance measurement?
Floop's accelerometer-based measurement is accurate to within a few centimeters for typical drops under 1.5 meters. The physics formula s = ½gt² gives a reliable result when your phone is in true freefall. Rotational spin or very long drops can add small variance, but scores are consistent and fully comparable across players.
How does the freefall distance tracker work?
Floop uses the DeviceMotion API built into your phone's browser. During freefall, your phone's accelerometer reads near-zero gravity. Floop times exactly how long that freefall state lasts, then applies the kinematic equation s = ½gt² to calculate the drop distance. No download required — it runs entirely in your browser.
Is it safe to use?
Yes, with sensible precautions. Always drop onto a soft landing surface — a bed, couch, or carpet. Floop is sensitive enough to measure very short drops, so you don't need height to get a good score. Never drop over hard floors or in crowded spaces.
What devices are supported?
Any smartphone or tablet with a modern browser — iPhone (Safari), Android (Chrome), and most recent devices. The DeviceMotion API is available on iOS and Android without any app install. Desktop computers don't have accelerometers, so they can view the site but can't record drops.
Is it free?
Yes, completely free. No account required, no app install, no payment. Open floop.polsia.app/app in Safari or Chrome on your phone and start measuring immediately.