# Harry's LapTimer Grand Prix

> Advanced car enthusiast tool for sensor data recording and driving performance optimization. (iPhone/iPad app by Harald Schlangmann.)

- Source: https://appshunter.io/ios/app/harrys-laptimer-grand-prix/id363556704 (this page in markdown: same URL + `.md`)
- Developer: [Harald Schlangmann](https://appshunter.io/developer/307688601)
- Category: Sports, Navigation
- Price: $27.99
- Rating: 4.00/5 from 80 App Store ratings · 98 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 81 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2010-04-02
- Data updated: 2026-08-25
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/harrys-laptimer-grand-prix/id363556704/reviews.md

## What is Harry's LapTimer Grand Prix?

Harry's LapTimer is the advanced tool for car enthusiast. It records all types of sensor data provided by your iPhone/iPod/iPad (or external sensors), combines them, and makes them available to optimize your drive. Over time, you will get insights on your car and in your driving, not known before.

LapTimer offers more than 1300 predefined tracks world wide. With its assistants, it is extremely easy to setup - just click your track and drive. It fully automates your lap timing using GPS, and presents the results to all kinds of media.

You are not limited to track driving only. For example, you may define your home and working locations as a 'track', collect statistics on different ways chosen, and analyze / optimize the time used every day. 

Want to show your drive to your friends? LapTimer Petrolhead and above generates beautiful in car video recordings with all kinds of data overlaid, ready to be presented - e.g. on youtube. Even without video, recorded data can be analyzed using purpose designed views, making it easy to analyze and improve your driving performance.

Using online racing, you can use LapTimer in competition. LapTimer offers a Hall of Fame, allows watching you and your friends on track - all in real time. Compare your sector times, braking / acceleration points, and learn from each other. 

You can start with your plain iPhone in the beginning and add external GPS and OBD II sensors later, step by step, and as you need it. LapTimer itself comes in three different editions: LapTimer Rookie is the entry level with all you need for lap timing; LapTimer Petrolhead is the advanced version including lots of video features, and LapTimer Grand Prix is the edition for professionals including Multi Cam recording, Health Kit integration, and advanced sensor and analytics functionality. 

Please note that functionality depends on your device, the LapTimer edition chosen, and sometimes even external sensors added (like OBD II). Please visit our web page to get the full story. All edition can be upgraded later, all editions come with native iPhone and iPad support. 

There are quite expensive stand alone solutions for track days available. Be smart and own the leading edge tool simply by using your iPhone and LapTimer. Besides the professional area, there is no known solution that offers more functionality than LapTimer does - across the market. As our ambition is to offer the best tool, LapTimer is enhanced continuously.

Please visit http://www.gps-laptimer.de for detailed information on versions, FAQs / documentation, in depth technology background information, online racing, and supported device configurations. Join our user community on http://www.gps-laptimer-forum.de to be involved in future development - all with first class support.

## Key features

- 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)

## Recent user reviews (10 of 98)

All indexed reviews: https://appshunter.io/ios/app/harrys-laptimer-grand-prix/id363556704/reviews.md

### 1/5 — Garbage

*2025-07-20*

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

### 5/5 — super plus klasse :)

*2025-01-30*

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

### 1/5 — Poor- avoid

*2024-04-02*

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

### 1/5 — Absolute junk app

*2023-09-06*

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.

### 4/5 — Very comprehensive but adding video…?

*2023-06-01*

This app is great, comprehensive and analytical. I wanted to use it to insert telemetry into a video and it is NOT intuitive nor remotely easy as RaceChrono Pro and it was difficult!  I probably won’t be using.

### 3/5 — Kleine verbesserungsvorschlage

*2022-06-22*

Leider wird die geladene Strecke nicht angezeigt und somit ist man unsicher ob die rixhtige Strecke geladen ist und wenn dann das Netz schlecht ist steht man dumm da

Verschiedentlich wird kein video aufgezeichnet obwohl es eingestellt wurde

### 3/5 — gopro9怎么连接啊

*2021-11-09*

gopro999999

### 5/5 — ios15有bug

*2021-11-06*

视频无法播放，软件卡顿，希望优化

### 4/5 — Compatibilité Go Pro ?

*2021-07-21*

Bonjour, j’ai acheté lap timer Grand prix ! Dans votre descriptif vous annoncez être comptatible avec les Go pro ! J’ai donc acheter la Hero 9 avant d’avoir acheter lap timer ! Votre app ne reconnais pas la hero 9 ! Avez vous une solution pour moi ? Pensez vous avoir une mise à jour prochaine pour rendre compatible votre app avec les nouvelles Go Pro ? Merci cordialement Mikael

### 5/5 — Great app

*2021-06-24, version 24.5*

You can’t really beat it for the price. Lots of data for that price. Know that it’s not as accurate until you purchase an external gps. Even with that, it’s still going to be cheaper than a dedicated gps lap timer. My current set up is an old iPhone, xgps160 and Harry’s . 

Some folks mentioned it’s counterintuitive. If you can’t figure out how to use it, maybe riding on a race track isn’t for you.you push like 3 buttons to start logging laps. Maybe more if you haven’t loaded your track yet. So yeah, saying it’s counterintuitive isn’t a true statement imho.

## Frequently asked questions about Harry's LapTimer Grand Prix

### 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.

## Version history (last 5 releases)

### 25.1.0 — 2026-06-27

User Interface
- fixed dragging POIs in Map
- added option to scroll buttons in case available buttons do not fit screen width
- fixed misplaced sector indicator in Timer View

CarPlay
- fixed crash when app is started from CarPlay
- fixed negative height display in CarPlay

Sensor support
- added support for Haze GNSS sensors
- added OBD support for Hybrid battery SoC plus tank gadget allowing to toggle between tank and battery level
- added heading support for NMEA sensors w/o RMC (like Columbus)
- fixed a scripting error in RaceboxMini sensor implementation
- made hundreds seconds handling for Racebox Mini more robust
- fixed a bug in CSV headers

### 25.0.1 — 2025-05-14

- redesigned CarPlay startup
- fixed a bug crashing LapTimer when started with CarPlay connected
- some minor interface changes and fixes
- switched to Inches for very precise accuracy displays

### 25.0.0 — 2025-05-06

- new: support for Apple CarPlay added
- reimplemented support for RaceBox Mini, Mini S and added RaceBox Micro
- added support for RTK GNSS sensors
- added support for Columbus P-70 Ultra sensor
- change accuracy precision to centimeters / inches
- added support for NetRTK / NTRIP casters
- completely new and full localizations for Japanese, Chinese (traditional, simplified), Spanisch, French, Italian
- made NMEA parser more resilient to changing sentence pattern
- updated list of iPad/iPhone models (M4 iPad, iPhone 16)
- fixed a bug in day / night weather icons
- fixed a problem that positioned forward / backward buttons wrongly in Lap Details
- fixed order of parameters in Sensor Configuration dialogs 
- improved BTLE write operations
- improved NMEA sentence displays
- dozens of minor fixes, improvements, features

### 24.9.1 — 2024-06-30

- reworked routines checking available storage
- use expert setting "Low Memory" to remove all storage checkings

### 24.9.0 — 2024-05-06

- fixed a bug in gear calculation
- replaced deprecated acceleration framework
- added support for Vgate vLinker FD+/MC+/BM+ OBD adapters
- fixed and improved VBO import
- rechecked Racebox integration to deliver high update rates

## Apps similar to Harry's LapTimer Grand Prix

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Timer for Workouts - Repeat](https://appshunter.io/ios/app/timer-for-workouts-repeat/id481226913) | 4.6 (1,388) | Free | Sports |
| [LITPro - GPS Lap Timer](https://appshunter.io/ios/app/litpro-gps-lap-timer/id940870782) | 4.6 (327) | Free | Sports |
| [Simple Interval Timer](https://appshunter.io/ios/app/simple-interval-timer/id458334253) | 4.9 (5,318) | Free | Sports |
| [3DSkiTracks - Switzerland](https://appshunter.io/ios/app/3dskitracks-switzerland/id1193592980) | 1.0 (1) | Free | Sports |
| [SkiMax](https://appshunter.io/ios/app/skimax/id1175865140) | — | Free | Sports |
| [i-Boating:HD Gps Marine Charts](https://appshunter.io/ios/app/i-boatinghd-gps-marine-charts/id1216013180) | 4.4 (92) | Free | Sports |

## More apps by Harald Schlangmann

- [Harry's LapTimer Rookie](https://appshunter.io/ios/app/harrys-laptimer-rookie/id307688598)
- [Harry's Sailor](https://appshunter.io/ios/app/harrys-sailor/id319244049)
- [Harry's GPS/OBD Buddy](https://appshunter.io/ios/app/harrys-gpsobd-buddy/id320423931)
- [Harry's LapTimer Petrolhead](https://appshunter.io/ios/app/harrys-laptimer-petrolhead/id338257907)
- [Harry's Camper](https://appshunter.io/ios/app/harrys-camper/id952167017)

All apps by Harald Schlangmann: https://appshunter.io/developer/307688601

## Related topics

[vbox laptimer](https://appshunter.io/ios/topics/vbox-laptimer) · [harrys laptimer](https://appshunter.io/ios/topics/harrys-laptimer) · [gpro ood](https://appshunter.io/ios/topics/gpro-ood)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*