Harry's LapTimer Grand Prix

Harry's LapTimer Grand Prix

by Harald Schlangmann

81 ratings
99 reviews
$27.99

Details

Released
April 2, 2010
Updated
October 27, 2026

Features

Harry's LapTimer Grand Prix screenshot #1 for iPhone
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Harry's LapTimer Grand Prix screenshot #10 for iPhone
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About

This app records and analyzes sensor data from your device to help you optimize driving performance. It offers automated lap timing, video recording with data overlays, and real-time online racing features. Track your progress on over 1300 predefined tracks or everyday routes.

✓Sensor data recording
✓Automated lap timing
✓In-car video recording with data overlay
✓Real-time online racing and competition
✓Track and everyday route analysis
✓External sensor integration (GPS, OBD II)
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What's New in Harry's LapTimer Grand Prix

26.0.0

October 27, 2026

User Interface - Added full support for the new iPhone Duo—both the outer screen and the huge inner screen - Modernized the front end to match the iOS 26/27 style - Reworked tile configuration and display options for various screen sizes - Improved dozens of icons, spacing, colors, and layouts - Reworked the Speed and Classic timer views (digital speed and time displays) Media - Fixed an issue that caused media library access to freeze after applying video overlays - Eliminated flickering in long lists of video thumbnails Sensors - Made all pro sensor support previously restricted to the GrandPrix edition available in all editions - Improved OBD result parsing Data - Modernized and expanded VBO imports for better compatibility with third-party apps - Added automatic date recognition for VBO and NMEA imports Plus hundreds of smaller improvements and fixes

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User reviews

Harry‘s LapTimer GP

Absolut grandios!

Garbage

1) Doesn’t work with GoPro
2) only uses the RaceBox GPS (no accelerometer
3) even when it says the RaceBox GPS is connected, it won’t use it

This is the first time I’ve ever wanted a refund for an app; wish me luck in obtaining it

super plus klasse :)

nutze die app sehr lange schon auf trackdays. Nun auch in stvo land zur verbrauchs und reichweiten ermittlung von batterie autos

Poor- avoid

Unreliable and inconsistent. Just sends a copy and paste message when you raise issues. Don’t waste your money.

Absolute junk app

This is the most money I’ve ever spent for an app to be such crap it doesn’t function anything like how it was described. I spent an entire track day trying to calibrate it and wasted more time than it’s worth. It told me I did a 45 min lap time around COTA for one of my sessions. Just junk. The developers should be ashamed at the steaming pile they’ve wasted their college degrees creating.
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Developer apps

FAQ

What does Harry's LapTimer Grand Prix do?

Harry's LapTimer Grand Prix is an advanced tool for car enthusiasts that records and analyzes various sensor data from your iPhone or external sensors. It helps you optimize your driving by providing insights into your car and driving habits, automating lap timing, and offering video recording with data overlays.

What are the key features of Harry's LapTimer Grand Prix?

Key features include automated lap timing using GPS, recording of sensor data, creation of in-car video recordings with data overlays, real-time online racing with friends, and analysis of driving performance on over 1300 predefined tracks or custom routes.

How much does Harry's LapTimer Grand Prix cost?

The app comes in three editions: Rookie, Petrolhead, and Grand Prix, with varying features. While the description doesn't explicitly state a price, it mentions that all editions can be upgraded, suggesting a tiered pricing or freemium model. Users can visit the provided website for detailed information on versions and pricing.

What devices is Harry's LapTimer Grand Prix compatible with?

The app offers native iPhone and iPad support. Functionality can depend on the specific device, the chosen LapTimer edition, and potentially external sensors like OBD II. Detailed compatibility information is available on the developer's website.

Can I use Harry's LapTimer for everyday driving, not just track days?

Yes, the app is not limited to track driving. You can define your home and work locations as 'tracks' to collect statistics on different routes and analyze your daily commute or travel times to optimize efficiency.