# Harry's LapTimer Petrolhead — user reviews > 174 indexed App Store user reviews of Harry's LapTimer Petrolhead by Harald Schlangmann, rated 3.80/5 from 152 ratings. - Source: https://appshunter.io/ios/app/harrys-laptimer-petrolhead/id338257907/reviews - App overview in markdown: https://appshunter.io/ios/app/harrys-laptimer-petrolhead/id338257907.md - Rating breakdown: 5★ 82 · 4★ 24 · 3★ 9 · 2★ 11 · 1★ 26 ## What do users think of Harry's LapTimer Petrolhead? Overall sentiment: mixed **Pros** - 📊 Comprehensive data logging and telemetry analysis - 🎥 Excellent video overlay capabilities with telemetry - 💰 Affordable alternative to expensive professional systems - 🛠️ Highly responsive developer with active support - 🏁 Accurate lap timing when properly configured - 📱 Feature-rich functionality for track day enthusiasts - 🔄 Frequent updates and continuous improvements - 🌍 Extensive track database with global coverage - ⚙️ Support for external GPS and OBD2 devices - 👥 Strong community and user support network **Cons** - 🐛 Frequent app crashes and freezes - 🎮 Confusing and unintuitive user interface - 📍 Unreliable GPS tracking without external devices - 🔌 Poor Bluetooth connectivity with accessories - 📹 Video export causes app malfunction - ⚠️ Inconsistent reliability across different tracks - 🔧 Requires extensive setup and configuration - 📚 Inadequate documentation and tutorials - 🌡️ Phone overheating issues during use - 🔄 Requires app restart after video operations **Commonly reported bugs** - 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 - 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 **Most requested features** - 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 - 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 ## Newest reviews (10 of 174) ### 2/5 — Too buggy and unreliable for video *2026-05-13* 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. ### 3/5 — IT nerds only *2021-03-14, version 24.0* Absolutely waste of money. Nothing syncs. No useful tutorials. 74 page PDF that makes no sense. You need an engineering degree to get this to work with a simple GoPro. ### 1/5 — not worth a pinch of **** *2020-02-25, version 23.0.11* if i could give this app zero stars, that would still overrate it. it failed repeatedly during today’s track session. finally gave up and put my phone away. there’s &20 totally wasted. hopefully this will keep other drivers from wasting their money on this worthless app. ### 1/5 — unreliable *2020-01-28, version 23.0.11* This app never works at the track when it's time to go. I had such high hopes for iphone data logging. This app has been one of the most disappointing components of the entire process. I can't call support when I'm at the track. It would be nice if the app store allowed refunds. ### 4/5 — Great App! Minor Issues *2019-10-06* Videos always seem to be freezing up the app. Other than this, the app is quite good, but having external GPS for accuracy is a must. ### 1/5 — Worst UI of Track Timers Available *2019-09-04* Honestly disappointed to see this many users accepting such a subpar product. The user interface is viscously difficult to navigate, and missing key ‘ease of use’ that you would expect with a track tool. Overall, between lost sessions & general frustration with the UI, spend your time/$$ investing in other more reliable timers such as RaceChrono or TrackAddict from HPtuners. There are too many other aspects that require attention on race days to get this fed up with what should be an easy to use app. ### 1/5 — Upgraded to Grandprix through the app... still isn’t working with external camera *2019-07-21, version 23.0.3* Followed instructions to get go pro footage for overlay. Isn’t working. App is buggy and crashes on iPhone X. Too bad. Cool features but poor performance. ### 2/5 — Powerful but utterly confusing interface *2019-05-27* I setup video recording and proceeded to do laps in a cup car this weekend, with all indications that video was recording, and perhaps due to a wrong keypress the video did not save. It did capture lap times and other data. The last thing you need in the seat is to wonder what is the app doing. Needs a printed manual. ### 1/5 — Just Does’t Work *2019-02-25* I purchased this app for a weekend at Sebring. I wasn’t able to get it to function. There were three other people that had the same app and they had the same problem. How do I get my money back? So disappointed! ### 1/5 — Doesn’t work *2018-12-15, version 22.1.4* Not working for me ## Most critical reviews (10 lowest-rated) ### 1/5 — Not able to sort and weird functions *2026-05-17* 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. ### 1/5 — Barely Functional App *2025-07-06* 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. ### 1/5 — Absolutely Worthless App *2024-03-23* 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!! ### 1/5 — Not working *2022-09-01* Bought this App and inapp Video package. Completely not working, gopro 8 is Not being controlled. Contacted harry and was told to Start recording manually. Video cannot be added manually afterwards as the App shows no files on the phone. I want a refund ### 1/5 — Conditionally not working *2022-05-05* Yeah. Nothing works at Thunderhill here in Northern California. I Requested my money back and no response. Can’t even review how good it works if it doesn’t even record where I am. Checked all setting for gps and location but nothing worked. I’ll invest in a Garmin or something real. ### 1/5 — barely ever works *2021-12-11, version 24.5* timer barely ever works properly and video is equally bad or worse. on three attempts it says i have recoded video yet the play back function doesnt work. very frustrating when i have now missed recording three full events. such a shame as used to be good 10yrs ago. ### 1/5 — Use To Be Good Updates Don’t Work *2021-11-16* This app use to be pretty good but now they have not kept up with new phone operating systems and seems like this app has run its course. I just did an event at Sebring and none of the data works. The lap anylasis screen freezes up and forget about seeing your video or overlaying data. None of this works anymore!!! On Harry’s Laptimer Facebook page all these screen lock up freezing issues are noted but it’s also mentioned there is no fix. They mention a work around but that really doesn’t work due to screen freezing and app completely locking up. Beware do not waste your money or time with this app. ### 1/5 — OBD wird nicht erkannt *2021-08-05* Sehr enttäuscht, wenn ich mir die Auswahl der von der App unterstützen OBD Dongles ansehe, sind diese nur in USA erhältlich, oder längst durch neuere Modelle ersetzt… Der Verweis auf den Expert Modus ist da wenig hilfreich - Fehlkauf! ### 1/5 — Doesn’t work anymore *2021-03-28* Can get the track loaded and select drive and no data is recorded. Really bummed because I loved using the app in the past and it always worked great. Tried deleting and redownloading but it still would not record any lap data. ### 1/5 — CONSTANTLY CRASHING APP *2020-09-22, version 23.0.11* HOW DO I GET MY REFUND OF $27.99? ## Most praised reviews (10 highest-rated) ### 5/5 — Sehr gute App *2023-08-10* 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. ### 5/5 — Club racer essential. *2022-07-12, version 24.6.1* Must have app for track day enthusiast. It’s the Strava of motorsport. ### 5/5 — Amazing track app! *2021-08-22* Amazing track day app! Works flawlessly and easy to use. Accurate timer, useable data and always evolving. Plus, Harald provides awesome customer support. ### 5/5 — Top Laptimer *2020-05-08* Sehr guter Laptimer, der immer funktioniert. ### 5/5 — Top *2020-04-05* Sehr gute App! Leider etwas unübersichtlich und Anleitungen etc sind auf Englisch ### 5/5 — Simple and effective like my stock car! *2019-11-08* It works, it’s easy and my friends are all amazed at the telemetry data it displays while recording video. ### 5/5 — Einfach nur Super! *2019-10-12* Einfach nur Super! ### 5/5 — A+++++ *2019-07-22* One of the best apps I've downloaded on my phone. Has endless features and Harry is always actively engaging with users on the laptimer forum to solicit enhancements/upgrades to the app. I'm a casual HPDE/Autox'er and love this app! ### 5/5 — You can’t beat it *2019-05-17* I’ve been tracking Porsche’s for years. I’ve had $1000 systems such as Traqmate but that’s no longer sold and windows only support is tough. Porsche Track Precision app is terrible but HLT is super reliable. I use an external BT GPS and a BLE ODB adapter. Overall you just can’t beat HLT for cost to realizability to being able to dig into data. My only wish is if I could find 991.2 GT3 custom PID info for brake pressure and ESC like the Porsche track precision app. Thank you Harry for continuing to improve an already amazing app. PS I use the Grand Prix in app upgrade, worth every penny. ### 5/5 — Extremely capable laptimer *2019-05-16* Harry‘s Laptimer is a very capable performance analyzer. Video and GPS based analysis with that much flexibility is unparalleled on the iPhone. I recommend to visit his website for the excellent user‘s guide as the app can seem intimidating at first. Excellent support from the developer is also available through the forum there. --- *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 2026-08-30.*