Speed Estimator: Car Speed

How fast was that car? Point your phone at the road and Speed Estimator gives you a speed reading in real time — no radar, no extra hardware, no internet connection.

Speed Estimator turns your camera into a vehicle speed detector. On-device AI recognizes cars, trucks, buses and motorbikes as they pass, tracks them frame by frame, and estimates how fast they are moving in km/h or mph.

WHAT PEOPLE USE IT FOR
• Traffic on your street — find out whether cars really are speeding past your home or your child's school
• Curiosity — settle the "he must have been doing 80" argument on the spot
• Car and bike meets — compare passes, film the run, keep the top speed of the session
• Teaching — a hands-on way to show motion, distance and velocity in a physics class
• Content — record a 10-second clip with the speed shown on screen, then share it

HOW IT WORKS
1. Stand safely at the side of the road and point your camera across it
2. Calibrate once — it takes a few seconds
3. Watch live speed and distance appear over every vehicle, with the session's top speed

REAL-TIME AI, ENTIRELY ON YOUR PHONE
Detection runs locally on an optimized neural network. Nothing you film is uploaded, nothing is streamed to a server, and the app keeps working in airplane mode — in a tunnel, out in the countryside, or abroad with no data plan.

BUILT TO BE ACCURATE
• Quick calibration for the distance and angle of your scene
• Adjustable detection confidence and overlap thresholds
• Motion compensation, so a handheld phone does not invent speed
• Optional GPU acceleration on supported devices
• Show or hide bounding boxes, motion trails and FPS

RECORD AND KEEP
• 10-second clips with the speed overlay burned in, saved straight to your gallery
• Live distance readout and the top speed of every session
• Front or rear camera
• km/h or mph, switched in one tap

MADE TO BE PLEASANT TO USE
A clean dark "HUD" interface designed for outdoor light, full dark and light themes, and a big, readable speed display. Available in 15 languages.

FREE, NO ADS, NO ACCOUNT
Speed Estimator is free. No ads, no subscription, no sign-up, and the app never asks for your location. Anonymous usage and crash statistics help us fix bugs — the video you film stays on your phone.

QUESTIONS PEOPLE ASK
• Does it need internet? No. Vehicle detection runs entirely offline, on your device.
• How accurate is it? Once calibrated, close enough to compare passes and tell fast traffic from slow — but it is an estimate, not a measurement.
• Does it work at night? The camera needs to see the vehicle, so daylight or a well-lit street works best.
• Can I measure my own speed while driving? No. It is made to be used from the side of the road, with a phone that is not moving.
• Which vehicles does it detect? Cars, vans, trucks, buses and motorbikes.

If you have ever wanted to measure car speed with a camera, run a quick car speed test, check how fast traffic is going on your own street, or show a physics class what velocity really looks like, this is the app for it. Vehicle detection, object tracking and speed estimation all run offline with on-device AI, in km/h or mph, free and without ads.

Download Speed Estimator and find out how fast that car really was.

PLEASE READ
Speed Estimator gives an approximate estimate, for information and education only. Accuracy depends on your calibration, your angle and the conditions, and is not guaranteed. This is not a certified measuring instrument: never use it for legal, professional or safety-critical purposes. Never operate your phone while driving — set it up before you start, and always follow local traffic law.

Recent changes:
Stay in the loop 🔔
• New: optional notifications — news and tips, in your language
• Switch them on or off any time in Settings
• Fixed: in recorded videos, the detection boxes now line up with the vehicles
Thanks for using Speed Estimator — drive safe!