# Harry's LapTimer Grand Prix — user reviews > 98 indexed App Store user reviews of Harry's LapTimer Grand Prix by Harald Schlangmann, rated 4.00/5 from 80 ratings. - Source: https://appshunter.io/ios/app/harrys-laptimer-grand-prix/id363556704/reviews - App overview in markdown: https://appshunter.io/ios/app/harrys-laptimer-grand-prix/id363556704.md - Rating breakdown: 5★ 45 · 4★ 15 · 3★ 5 · 2★ 2 · 1★ 13 ## Newest reviews (12 of 98) ### 4/5 — Very comprehensive but adding video…? *2023-06-01* This app is great, comprehensive and analytical. I wanted to use it to insert telemetry into a video and it is NOT intuitive nor remotely easy as RaceChrono Pro and it was difficult! I probably won’t be using. ### 3/5 — Kleine verbesserungsvorschlage *2022-06-22* Leider wird die geladene Strecke nicht angezeigt und somit ist man unsicher ob die rixhtige Strecke geladen ist und wenn dann das Netz schlecht ist steht man dumm da Verschiedentlich wird kein video aufgezeichnet obwohl es eingestellt wurde ### 3/5 — gopro9怎么连接啊 *2021-11-09* gopro999999 ### 4/5 — Compatibilité Go Pro ? *2021-07-21* Bonjour, j’ai acheté lap timer Grand prix ! Dans votre descriptif vous annoncez être comptatible avec les Go pro ! J’ai donc acheter la Hero 9 avant d’avoir acheter lap timer ! Votre app ne reconnais pas la hero 9 ! Avez vous une solution pour moi ? Pensez vous avoir une mise à jour prochaine pour rendre compatible votre app avec les nouvelles Go Pro ? Merci cordialement Mikael ### 4/5 — How to connect to go pro hero black8 *2020-06-07* How to connect to go pro 8 ### 4/5 — Complete app for experts *2020-05-15* I have been using this app for almost two years now. It takes some time to set it up and learn to use it but after that it does everything. Now it looks like the app hasn't been updated in a long time and the video import doesn't work well anymore. I tried to do the usual, but the app can't show the video properly and finally crashes. I have iOS 13.3.1. Apple might have changed something in iOS that makes the app not work well. Update to the app is definitely needed. ### 2/5 — Not compatible with GoPro Hero 7 *2020-03-12* Very frustrating it doesn’t work with GoPro 7/iOS 13. Can’t overlay any data onto recorded lap video. ### 3/5 — Nicht seltene Abstürze *2019-10-03* Stürzt schon häufig ab. Grade wenn man einen gps tracker und eine externe Kamera verbinden will. ### 2/5 — Was good early now totally unreliable *2019-05-23* Been using it years, early versions were reliable and trustworthy. Last 2-3 years, its totally hit and miss. Ring trip, 2017 & 2018, recorded only 3 from 10 laps, Spa in Mar 2019, never actually recorded a time, just 55mins for the entire time I was out in a session. Do not understand why these issues are not put right, wrote to app designer, never heard back. POOR NOW !!!!!!!! ### 1/5 — Waste off money *2018-12-05* Anyone thinking of buying this app do yourself a favor and don’t!! It is a complete waste of money!! ### 4/5 — It takes some time to learn the app ! *2018-11-16* Extremely complicated and freezing all the time, but the developers really good and he responds to everybody on his Facebook page it means he cares about costumers!!! ### 1/5 — Problems *2018-10-19* Latest version does not work in ios12. Tried with 4 different iPhones. ## Most critical reviews (10 lowest-rated) ### 1/5 — Garbage *2025-07-20* 1) Doesn’t work with GoPro 2) only uses the RaceBox GPS (no accelerometer 3) even when it says the RaceBox GPS is connected, it won’t use it This is the first time I’ve ever wanted a refund for an app; wish me luck in obtaining it ### 1/5 — Poor- avoid *2024-04-02* Unreliable and inconsistent. Just sends a copy and paste message when you raise issues. Don’t waste your money. ### 1/5 — Absolute junk app *2023-09-06* This is the most money I’ve ever spent for an app to be such crap it doesn’t function anything like how it was described. I spent an entire track day trying to calibrate it and wasted more time than it’s worth. It told me I did a 45 min lap time around COTA for one of my sessions. Just junk. The developers should be ashamed at the steaming pile they’ve wasted their college degrees creating. ### 1/5 — Support is terrible *2021-05-06* Harry’s Forum don’t work. Can’t login, can’t register, can’t contact an administrator! Therefore updated info is hard to get. Harry has not updated the app to use the most recent GOPro 9’s. It is impossible to know if a $400 purchase will work unless we try. No thanks Harry, keep it, we will move on to more responsive application developers. ### 1/5 — Doesn’t work *2020-11-02* Never works, out of 10 track days this thing worked twice. Waste of Money very complicated ### 1/5 — Please update *2020-10-14* do not support Gopro 8 and Gopro 9 ### 1/5 — go pro8 还不能支持 *2020-07-08* go pro8 还不能支持 更新太慢了 ### 1/5 — Poor *2020-02-29* Unfortunately this app has stopped being an effective tool. On my last 2 outings oulton park and the ring both times it has failed to consistently acquire lap times at the ring no lap times at all. I have tryed mounting the iPhone directly on the dash. Still nothing. Used to work now No good Tried with both iPhone 10&11 same results ### 1/5 — Not working *2020-01-24* The app not working Is stock My I have iPhone version ios 13.3 Please refund my money Thanks dear ### 1/5 — Garbage App *2019-10-14* The short version: This app is garbage, over complicated, counterintuitive, doesn’t work as advertised and constantly freezes/crashes. Don’t waste your time or money on it. The long version: There is a 29 page pdf on their website that only deals with syncing up video. It is outdated, over complicated and should be simplified. It references apps to use for multiple cameras that are no longer available. After reading the exhaustive instructions because the app itself is not at all user friendly nor is it easy to figure out, I took some test drives with it and my GoPros. The app would either freeze up or crash, multiple times, resulting in me having to pull over and reset everything each time. When I finally recorded some decent video from all three cameras, I was unable to sync the videos together with data overlay. I came back later to try again and the app says that it can not locate the videos. This app is a huge waste of time and money. I would not recommend this to anyone. ## Most praised reviews (10 highest-rated) ### 5/5 — super plus klasse :) *2025-01-30* nutze die app sehr lange schon auf trackdays. Nun auch in stvo land zur verbrauchs und reichweiten ermittlung von batterie autos ### 5/5 — ios15有bug *2021-11-06* 视频无法播放，软件卡顿，希望优化 ### 5/5 — Great app *2021-06-24, version 24.5* You can’t really beat it for the price. Lots of data for that price. Know that it’s not as accurate until you purchase an external gps. Even with that, it’s still going to be cheaper than a dedicated gps lap timer. My current set up is an old iPhone, xgps160 and Harry’s . Some folks mentioned it’s counterintuitive. If you can’t figure out how to use it, maybe riding on a race track isn’t for you.you push like 3 buttons to start logging laps. Maybe more if you haven’t loaded your track yet. So yeah, saying it’s counterintuitive isn’t a true statement imho. ### 5/5 — Das Beste *2020-03-09* Ich habe mehrere LapTimer getestet. Definitiv der Beste. Sehr zu empfehlen. ### 5/5 — Does it all *2019-12-09* Been using the App for several years and it packs a ton of capability into your hands. It does require some trial and error and dedication to learn how to use properly, so that will deter some, but for those that want data and video overlay in a tight little package this is the best I’ve found. Harry’s support and updates are top notch! ### 5/5 — Worth the investment *2019-06-01* Works great and reliable Could use some interface design update to look less like it was "built in the garage by a dude"😉 overall great value 👍 Makes track days feel like MotoGP Update - still awesome. Updates and improvements keep rolling. ### 5/5 — Langjährige Begeisterung *2019-05-31* Seit 2014 nutze ich nun schon den Laptimer und bin einfach nur begeistert. Ob Videos mit overlays erstellen, an der persönlichen Bestzeit feilen oder mit Freunden nach einem Trackday Vergleiche ziehen, wo die Unterschiede liegen: All das geht mithilfe der App super leicht von der Hand. ### 5/5 — Profi Laptimer App *2019-03-20* Absolut spitzen App. Automatische Rundenzeiten auf der Rennstrecke, Video mit Overlay Funktion, ausführliche Statistiken und regelmäßige Updates. Gibt nichts besseres für die Rennstrecke. ### 5/5 — Great Lap Timer *2018-06-28* You get more with this App than what you pay for. The only thing missing is a Desktop application to sync it to so overlaying videos is much much easier. Hopefully that could happen one day. But for now I love being able to see lap times and the data that goes along with it. ### 5/5 — Spitze 🏁🏆 *2017-10-10* Super App - automatisch gemessene Lap Zeiten, Video Overlay mit aktueller Geschwindigkeit und Position auf der Strecke - funktioniert super. Jeden Cent wert! Es gibt keine bessere App für TrackDays 🏆. P.S. Regelmäßige Updates!!! --- *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.*