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SpeedShot turns your iPhone into a computer-vision speed gun. Point the camera at traffic, or pick a video you already shot, and on-device AI detects every car, bike, bus and truck, then estimates its real-world speed. The road is calibrated automatically from the vanishing point and lane markings — no manual setup, no GPS, no radar. Everything runs 100% on-device: no account, no network calls, no data collection. Free to try twice; one small one-time purchase unlocks unlimited use.
Hi Product Hunt,
I'm a solo developer from Japan. I built SpeedShot because of a question that comes up on every walk near a busy road: that car just blew past — how fast was it, really? There was never a quick way to answer that without a radar gun.
So I built one out of a phone camera. Point it at traffic, or drop in a clip you already shot, and on-device AI detects every vehicle, tracks it frame by frame, and works out its real-world speed from the geometry of the road itself — no GPS, no radar, no manual setup.
A few things I put real work into:
- Automatic road calibration. The app finds the vanishing point and lane-marking spacing in the clip and builds a scale model of the scene before it ever shows a number.
- Real object detection, not a filter. An on-device CoreML YOLOX model finds cars, motorcycles, buses and trucks; a Kalman-filtered tracker follows each one.
- Fully offline. No account, no network calls, no analytics — nothing ever leaves the phone.
- One optional one-time purchase after 2 free analyses. No subscription.
I built it in a few weeks. The hard part wasn't the object detection — it was making the speed math trustworthy without ever touching GPS or a second reference camera.
One honest caveat up front: the speed shown is an AI estimate for reference and fun, not a certified measurement — it's not meant for enforcement or as evidence.
I'd love to hear what you think: would you use this to settle an argument about how fast something was going, or is a phone camera never going to feel trustworthy enough for that?
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About SpeedShot on Product Hunt
“An iPhone camera that turns into an AI speed gun”
SpeedShot was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #146 on the daily leaderboard. SpeedShot turns your iPhone into a computer-vision speed gun. Point the camera at traffic, or pick a video you already shot, and on-device AI detects every car, bike, bus and truck, then estimates its real-world speed. The road is calibrated automatically from the vanishing point and lane markings — no manual setup, no GPS, no radar. Everything runs 100% on-device: no account, no network calls, no data collection. Free to try twice; one small one-time purchase unlocks unlimited use.
SpeedShot was featured in iOS (110.7k followers), Photography (143.2k followers) and Artificial Intelligence (476.1k followers) on Product Hunt. Together, these topics include over 164.7k products, making this a competitive space to launch in.
Who hunted SpeedShot?
SpeedShot was hunted by Tomohiko Saitoh. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how SpeedShot stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Tomohiko Saitoh