Harry's LapTimer Petrolhead vs Kerbz
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Harry's LapTimer Petrolhead
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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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.
Kerbz
Discover and book a variety of automotive experiences, from track days and rallies to car shows and meetups. Connect with fellow enthusiasts and manage your event registrations and bookings seamlessly.
- Discover motorsport events
- Book driving experiences
- Find car shows and rallies
- Connect with enthusiasts
- Manage event registrations
- Book performance cars
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Kerbz is the social platform for car enthusiasts. Whether your weekends are cars & coffee, a club meet, a show, a canyon drive or a track day, it's one place for all of it — the events, the cars, the people and the parts. YOUR GARAGE Add your cars once. Kerbz uses them everywhere: to find the events, the discussions and the parts that fit what you drive. THE PADDOCK Talk with people who own the same car. Builds and setups, where to meet, which track, what tires — organized by car and generation, so an answer comes from someone driving the same thing you are. THE MARKET Parts, wheels, tires, seats and gear, sold driver to driver. Every listing says what it fits, and every seller is a real driver you can look up — their cars, their events, their past deals. Meet at the next event to hand it over. EVENTS Discover and register for cars & coffee, car shows, club meets, track days, HPDE and autocross in a few taps. Add friends and see who's going. Group registration for your club or team. Your calendar keeps it all straight. ON TRACK Live timing during the event, lap records and personal bests afterwards, leaderboards by track and car. Share a lap and compare it against a friend's. RENTALS Book a track-ready car from a trusted host when you don't want to bring your own. COMMUNITY A feed of what your friends are doing, messaging, badges for the miles you've put in, and a profile that shows what you drive and where you've been. From someone who's never been to a track to someone who never leaves one, Kerbz is built for people who love cars and the weekends that come with them.
Screenshots
Verdict
The clearest difference is price: Kerbz at Free against Harry's LapTimer Petrolhead's $19.99. Kerbz also leads on rating (5.0 vs 3.8) and in-app purchases (none vs 1). Harry's LapTimer Petrolhead's advantage is ratings volume (153 vs 8) and chart position (#61 vs unranked). On ads and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Kerbz is free to download; Harry's LapTimer Petrolhead costs $19.99 up front. Harry's LapTimer Petrolhead sells 1 one-off in-app purchase. Kerbz asks for nothing beyond the download.
Kerbz holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Harry's LapTimer Petrolhead has 153 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 77% of Harry's LapTimer Petrolhead's written reviews are positive against 100% of Kerbz's.
Harry's LapTimer Petrolhead ships an update every 2 months, Kerbz daily. The most recent releases landed on November 1, 2026 and October 12, 2026 respectively.
| Parameter | Harry's LapTimer Petrolhead | Kerbz |
|---|---|---|
| Price | $19.99 | Free — better |
| Rating | 3.8 (153 ratings) | 5.0 (8 ratings) — better |
| Positive reviews | 76.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 153 — better | 8 |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #61 — better | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 78 MB | 69 MB |
| Age rating | 4+ | 17+ |
| Developer | Harald Schlangmann | Kerbz Adventures, Inc. |
Customer experience
Harry's LapTimer Petrolhead
Kerbz
Bugs and requests
Harry's LapTimer Petrolhead
Reported bugs
14 issues- App crashes when overlaying videos
- Video playback fails in Photos app until phone reboot
- Lap data not recording at certain tracks
- GPS location not recognized at specific venues
- Timer fails to start or record laps inconsistently
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- Screen freezes during lap analysis
- Video recording stops mid-session
- App locks up entire phone requiring hard restart
- Inaccurate speed and elevation data
- Inability to delete laps without app hanging
- Track loading failures and truncated track names
- Overlay settings reset after each use
- Incompatibility with newer iOS versions
- External GPS and OBD2 connection drops
Requested features
10 requests- Ability to pause timer between sessions
- Automatic video overlay for all laps without manual processing
- Better track variant identification in database
- Improved nearby track suggestions based on location
- Dark mode option
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- Call blocking during track sessions
- More Canadian track coverage
- Custom vehicle profile support for newer models
- Simplified user interface redesign
- Better export format compatibility for Mac users
Kerbz
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Harry's LapTimer Petrolhead
- Grand Prix Upgrade$9.99
Kerbz
No in-app purchases
Questions
Is Harry's LapTimer Petrolhead free?
Is Kerbz free?
Which has better reviews, Harry's LapTimer Petrolhead or Kerbz?
Do Harry's LapTimer Petrolhead or Kerbz have ads?
Which is updated more often, Harry's LapTimer Petrolhead or Kerbz?
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