Race Ninja vs Harry's LapTimer
Harry's LapTimer turns your phone into a serious data logger. Race Ninja turns the camera you already film with into the data source. One gives you live numbers on the device. The other gives you video-locked analysis and coaching afterwards.
Harry's LapTimer is a phone app. Visit their site
Feature comparison
| Feature | Harry's LapTimer | Race Ninja |
|---|---|---|
| GPS source | Phone or external 10-25Hz receiver | GoPro/DJI camera GPS (10Hz), no phone needed |
| Live timing | Yes, on phone or iPad while you drive | No. Post-session analysis |
| OBD-II engine data | Yes, reads live engine data from your car | No OBD. Import logger data from Alfano or AiM instead |
| AI coaching | Not included | Written against your actual footage, corner by corner |
| Video sync | Phone camera with manual alignment | Native. GPS is embedded in the video file |
| Platform | iOS only | Browser on any device |
The honest verdict
When Harry's LapTimer works better
- You drive a car with OBD-II and want live engine data on your phone.
- You already own a quality external GPS puck and like the iOS logger workflow.
- You want live delta timing on an iPad mounted in the cockpit.
- Harry's advanced data plotting features match how you already debrief.
When Race Ninja is the better choice
- You don't want a phone or tablet mounted on a race kart or track car.
- You want AI coaching that points at the exact moment in your video.
- Your camera already records GPS and you want analysis without extra hardware.
- You use Android, Linux, or just prefer a browser that works on anything.
Harry's LapTimer vs Race Ninja: common questions
What is the main difference between Harry's LapTimer and Race Ninja?
Harry's turns your phone into a data logger with live feedback on track. Race Ninja reads the GPS from your camera file after the session and gives you sectors, coaching and overlays. The phone approach gives you numbers in the seat. The camera approach gives you video proof afterwards.
Do I need to mount my phone on the kart?
With Harry's, yes. The phone is the GPS receiver and the display. With Race Ninja, no. The GoPro or DJI camera is the only device on the kart. Your phone stays in your bag.
Does Race Ninja support external GPS receivers?
No, and it doesn't need one. The GPS is already inside your GoPro (10Hz) or paired with your DJI via the GPS remote. You don't buy, charge or pair a separate GPS puck.