Harry's LapTimer Petrolhead

Harry's LapTimer Petrolhead

By Harald Schlangmann

  • Category: Sports
  • Release Date: 2009-11-24
  • Current Version: 21.2.0
  • Adult Rating: 4+
  • File Size: 77.52 MB
  • Developer: Harald Schlangmann
  • Compatibility: Requires iOS 9.3 or later.
Score: 4.5
From 154 Ratings


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 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.



  • Great for big track, nearly useless for AX

    By anastasia in san diego
    App always works great at tracks like Auto Club Speedway--times very close to official times, records every lap no prob. Very sporadic for AX--records laps arbitrarily, sometimes it works, other times inexplicably not recorded. I wouldn't pay $20 for it unless u track alot.
  • Best racing app

    By Kshcsnsidjsn837482
    Awesome app, wish there was a way to cut off incoming calls while using it
  • Great lap time tracker

    By Interdigitate
    Used it for the first time this past weekend and loved it. Only thing I would recommend is the ability to pause the time keeper or create sessions since everytime I clicked stopped when I came into the pits, I had to load the map again to start time keeping which was an extra step I don't think we should have to do.
  • Fix the darn app already

    By siberian7
    So many bugs in each version/update! Now I can even add a 2016 Porsche cause it doesn't recognize it!!
  • Its great when it works.. But it does rarely do its job

    By Alienfriend.no.1
    More bugs than a Motel 6!! And every update adds more of them. Have the app on the 6plus. Everytime i want to record the app crashes in the middle or just when i want to turn it off after the run. Im first time at sonoma with ZERO footage after trying to record for a full track day. It crashes and restarts the whole phone way too often. I cant erase videos because it crashed immediatly if i go in the housekeeping screen. It also crashes right after overlapping a video "succesfully".. If the app wouldnt be all that buggy it would be great.
  • The #1 accessory you can get to go faster on the track!!

    By aashishthakker
    I kid you not- as a weekend track addict (I try and do about 6-8 weekends a year) I find Harry's Lap Timer to be the best investment I have made that has made me improve my times! Being able to capture consistent data points, sector/lap times and being able to overlay video (with MultiCam support of GoPro!) allows one to see where they are doing well and where one can improve. My favorite things about the app: * support for OBDII sensors * support for external GPS * support for multi cameras (iPhone, iPad and GoPro cameras) * in-device support for overlaying multiple videos, data points from sensors on to track map * ability to set a Reference lap and compare all other laps to it Only a fellow track addict can develop such an app - and it shows how well it's been written!
  • Best app out there for a weekend racer

    By Yotaswan
    To say this app is anything less awesome is insane. In my opinion this has been the best purchase I have made from the App Store. The app itself has helped me to become a better driver at autocross events as well as hpde events at the local race track. It allows you to overlay data from sensors you have plugged into your car or phone that help create videos that blows my friends and family away. I highly recommend this app to any weekend racers out there. You will not regret it.
  • Excellent

    By NbJosh
    The best timing app or AutoX and track days, and helped me win my first race by keeping me on pace for 20 laps
  • Great functionality, UX needs work

    By Andrew Khoury
    Fantastic app, very accurate lap times, and great telemetry data. The UX is pretty clunky and could use a design overhall.
  • Best track app!

    By rfgf1
    I reviewed other versions of this app in the past, and this review is going to be more of the same praise. Harry's GPS Lap Timer provides as comprehensive a solution as the iphone can handle, performing much of the same functionality as the vastly more expensive dedicated timing solutions, requires virtually no setup at the track, and just flat works! Used the Petrolhead version at Indy Motor Speedway this past weekend (my 7th event this summer), and impressed my garage-mates with the timing and video the app produced. Additionally, I had a question over the weekend that I posed to Harry; he responded very quickly, and I was up and running for the next session. Brilliant app and fantastic customer service!