Harry's LapTimer Petrolhead

Harry's LapTimer Petrolhead

by Harald Schlangmann

152 ratings
174 reviews
$19.99
In-App Purchases

Details

  • Released
  • Updated
Harry's LapTimer Petrolhead screenshot #1 for iPhone
Harry's LapTimer Petrolhead screenshot #2 for iPhone
Harry's LapTimer Petrolhead screenshot #3 for iPhone
Harry's LapTimer Petrolhead screenshot #4 for iPhone
Harry's LapTimer Petrolhead screenshot #5 for iPhone
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About

This app is an advanced tool for car enthusiasts to record and analyze sensor data for optimizing driving performance. It offers automated lap timing, video recording with data overlays, and real-time online racing competition features.

Records sensor data (GPS, OBD II)
Automated lap timing with 1300+ predefined tracks
In-car video recording with data overlays
Real-time online racing and competition
Driving performance analysis and optimization
Step-by-step sensor integration
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What users say

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What's New in Harry's LapTimer Petrolhead

25.1.0

June 25, 2026

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

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In-App Purchases

$9.99

Grand Prix Upgrade

This upgrade will turn your LapTimer Petrolhead Edition into LapTimer Grand Prix. Additional features are reference lap picture in picture, professional sensor support, and enhanced analytics (additional charts, cursor details,video cursor).

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Charts

Top Paid

📉 52-3

Sports

This app dropped -3 positions in Sports chart.

Last updated on July 20, 2026.

User reviews

Not able to sort and weird functions

Lots of weird buttons that is unclear what it does to your videos. Pushed something trying to export and all of them disappeared. Not able to sort by best time, only by date/time. Records upside down and can’t automatically set to upright position, but all screen info is upright.

Too buggy and unreliable for video

I bought this many years ago and used to work great. but over the years Harry has added so many features that the app has become extremely unreliable. He really needs to restart and build an app that is much simpler and easy to use, and reliable. The biggest problem I have right now is that when I record a video, it is extremely difficult to extract the video including overlay data onto my iPhone. I have to first narrow things down to a specific lap, and then when I try to export that to my iPhone it fails 9/10 times. Even when it succeeds, it takes 5-10 minutes to export each lap video. Far too painful.
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Barely Functional App

I can overlook Bluetooth connectivity issues for the data and overlay, although I purchased and use recommended gps and OBD2 devices. Those are spotty at best. The app does fine of data logging and the video looks good. But when you overly and export a video the app basically won’t do anymore video viewing or exporting. Then in the photos app you can’t view the video that was exported (or any other video in your library) until you reboot the phone. The app did this with my iPhone 15 Pro and now the same with my brand new 16 Pro. I’ve deleted the app and moved on. Payed a bit more for the Garmin Catalyst but it’s much better. Harry’s lap timer is nothing but headaches.
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Absolutely Worthless App

Purchased this app that was referred by a friend who races but come to find out all of the local tracks are Not on that app. To get all of the maps you have to purchase the other Harry’s Track app. They know this but decide to screw people out of their money hoping people will purchase both apps. I could never get the first Harry’s app to work so beware!!
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Sehr gute App

Ich habe die App schon seit Jahren in Benutzung. Habe sie früher zur Rundenzeiterfassung beim Moto Cross benutzt, dann beim Speedway und jetzt beim Flattrack fahren. Einfach Start-Ziellinie auf neuem Track setzen, Namen vergeben und ab gehts. Verwende ein altes IPhone mit Quadlock Halter >>> funktioniert perfekt und hält wunderbar.
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Developer apps

User experience

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Reported Bugs

14 issues

App crashes when overlaying videos

Bug

Video playback fails in Photos app until phone reboot

Bug

Lap data not recording at certain tracks

Bug

GPS location not recognized at specific venues

Bug

Timer fails to start or record laps inconsistently

Bug

Screen freezes during lap analysis

Bug

Video recording stops mid-session

Bug

App locks up entire phone requiring hard restart

Bug

Inaccurate speed and elevation data

Bug

Inability to delete laps without app hanging

Bug

Track loading failures and truncated track names

Bug

Overlay settings reset after each use

Bug

Incompatibility with newer iOS versions

Bug

External GPS and OBD2 connection drops

Bug

Requested Features

10 requests

Ability to pause timer between sessions

Feature

Automatic video overlay for all laps without manual processing

Feature

Better track variant identification in database

Feature

Improved nearby track suggestions based on location

Feature

Dark mode option

Feature

Call blocking during track sessions

Feature

More Canadian track coverage

Feature

Custom vehicle profile support for newer models

Feature

Simplified user interface redesign

Feature

Better export format compatibility for Mac users

Feature

FAQ

What does Harry's LapTimer Petrolhead do?

Harry's LapTimer Petrolhead is an advanced tool for car enthusiasts that records various sensor data from your device and external sensors. It uses this data to provide insights for optimizing your driving, automate lap timing on over 1300 tracks, and generate in-car video recordings with data overlays.

What are the key features of this app?

Key features include automated lap timing using GPS, the ability to record and analyze sensor data, creation of in-car videos with data overlays, and real-time online racing with friends. It also allows for step-by-step integration of external sensors like OBD II.

How much does Harry's LapTimer Petrolhead cost?

The app is available in different editions, with LapTimer Rookie being the entry-level option. The Petrolhead edition includes video features, and the Grand Prix edition is for professionals. While the base app may be free, advanced features and editions likely involve in-app purchases or upgrades.

What devices is this app compatible with?

The app is designed for iPhone, iPod, and iPad, offering native support for both. Functionality can depend on the specific device, the chosen LapTimer edition, and any external sensors that are added.

Can I use this app for daily driving analysis, 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, analyze your daily commute times, and optimize the time you use each day.