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 1000 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 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, 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 for detailed information on versions, FAQs / documentation, in depth technology background information, online racing, and supported device configurations. Join our user community on to be involved in future development - all with first class support.

What's New

Version 21.2.0

Changed in v21.2

‣ Added full support for native resolutions (iPhones X, 8, 8 Plus)
‣ Raised minimal iOS version to 9.3
‣ Added tool bar for all list views
‣ Multiple changes to sensor framework, added Expert Settings
‣ Added support for TONWON BTLE OBD sensor
‣ Added a work around for Alfa Romeo Giulia QV OBD replies
‣ Simplified sensor delay scheme
‣ Memory and performance optimizations

We have massive changes to the user interface in this version.
In case you observe misalignments or see something that needs to be trimmed,
please drop us a note!

Customer Reviews

3.4 out of 5

5 Ratings

5 Ratings

Great way to view iphone LapTimer data!


This is the best way to view and analyze lapping data. This app gives you some extra information (over and above the iphone app) while using the same views as are included with the iphone app. The new diagram view lets you see your current lap's speed at any point on the track as well as that of your reference lap (simultaneously). Very slick! Also gives you the accumulated time differential at any point during each lap for the two laps selected. And now with the new user-configurable color selection relating to lateral Gs on the lap diagram, I can better analyze which corners I need to work on. And the elevation map is particularly interesting, particularly at a track like Road America which has 170+ feet of elevation change. Have used at three tracks so far this summer with great reuslts. Go Harry, go!
Version 14.2 update:
Same quality as before, it just works, and continues to amaze my rack buddies with TraqMates. Absolutely no issues, the software works amazingly well, and next time in Germany I'll search out Harry and buy him a beer!

Track Junkie!


While there are certainly more precise equipment and software out there available to the hardcore racers, it's hard to deny Harry's work in his laptimer series. I owe both the Laptimer Pro and Laptimer trainer. For the cost of the apps, and the fact that I already had an iPhone 4 and iPad for other reasons, they are dollar for dollar, some of the best data acquisition and analyzing software a track junkie could invest in.

For beginners: It allows for raw video recording followed by overlaying the data onto the edited video so that one may see the data of their lap in a fun manner.

For the hobbyist: Simply record the session and sort through the laps to see how one handled each corner in terms of acceleration and cornering data.

For a track junkie: Add additional external sensor for a data acquisition system that still costs hundreds to thousands less to anything else out there today. For instance, the internal GPS of the iPhone runs at about 1 Hz. Third party GPS sensors are available from $100 for a 5 Hz sensor, $150 for a 10 Hz sensor, and 20 Hz competitive sensor for around $400. The higher the hertz, the more accurate the time is, as well as the data acquisition.

Again, best investment I have made towards my tracking experience.

Perfect for trackdays!


I was searching for a user friendly, cost effective way to track my progress and it share it with the world, as I have just began riding my motorcycle at track days in Texas! The fact that LapTimer has so many tracks Pre loaded into its system for easy access makes this app a no brainer! Multi cam recording and then adding the track overlays are so awesome! I will be using Harry's LapTimer and the last track day of the season at COTA (Austin,TX). I can't wait to show off the footage. I have recommended this app to lots of my friends looking for a way to get lap times with out braking their bank accounts! It's easy to use and there is a lot of documentation available if you can figure something out. Plus the forum! Nothing compares to Harry's LapTimer!


Harald Schlangmann
81.3 MB
Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, German, Italian, Japanese, Simplified Chinese, Spanish, Traditional Chinese
Age Rating
Rated 4+
© Harald Schlangmann


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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