# CarTest - Performance Tester — Car acceleration measurement > Vehicle acceleration performance measurement tool. (iPhone/iPad app by Takao Ichimura.) - Source: https://appshunter.io/ios/app/cartest-performance-tester/id1534136951 (this page in markdown: same URL + `.md`) - Developer: [Takao Ichimura](https://appshunter.io/developer/1474061593) - Category: Sports, Utilities - Price: Free with in-app purchases - Rating: 4.20/5 from 13 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 8 MB - Languages: American English, Japanese, Chinese (Simplified, China) - Released: 2020-10-08 - Data updated: 2026-08-15 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/cartest-performance-tester/id1534136951/reviews.md ## What is CarTest? "CarTest" is a tool app that measures acceleration performance of cars, motorcycles. You can easily measure times such as 0-60 mph, 0-1/4 mile by CarTest. It is useful for not only measuring full throttle performance but also knowing the usual acceleration on public road for safe driving. Please use it with safety first. Please comply with the law when using it on public roads. (How to use) 1. Fix the iPhone (or iPad with GPS) with CarTest installed on the dashboard of your car so that it does not wobble. When using it on a motorcycle, install it on the handlebar or fuel tank. 2. Tap the "Start/Sensing" button or "Start/Countdown" button. After that, instructions will be displayed. 3. If the "Start/Sensing" button is tapped, measurements will be taken repeatedly. Press the "Stop" button to end the measurement. 4. Once the measurement is complete, the latest results will be displayed. The measurement date is also displayed, and the last line indicates the start status as shown below. - Sensing: Sensing start - ○Clean: No False with Countdown start - ×False: False with Countdown start 5. To view previous results, tap the "▼Prev" button. (Button function) - Stop: Measurement ends. If you tap before the count reaches zero in Countdown start mode, the state before the countdown started will be restored. - Start/Countdown: The time will start with a countdown and be measured. False start will be checked. - Start/Sensing: The system detects when the vehicle starts and measures the time. The measurement is repeated. - Share: A window opens to share the displayed result. - ▲Next: Displays results newer than the past results displayed by clicking the "▼Prev" button. - ▼Prev: Displays older results. - km/h / mph: Selects the unit of speed - ↑ / ↓: Page scroll. These buttons are enable when there are other results behind while viewing history. (Measurement range) - km/h: From 0-20 km/h to unlimited every 20 km/h. 0-400 m. 0-1 km. - mph: From 0-10 mph to unlimited every 10 mph. 0-1/4 mile. 0-1 km. - Max speed (Large speed display on the screen) When in the stopped state (when neither "Start/Countdown" nor "Start/Sensing" buttons are tapped), tap the "Stop" button twice to turn it on and off. The speed is displayed during measurement. (Start-sensor sensitivity setting) In the stopping state, tap buttons “Stop" → "▲Next" → "▼ Prev" → "▲Next" → "▲Next" to open the setting window at the top of the screen. You can select 5 levels of sensitivity. Please adjust it if there are many false positives or if the response is slow. It is probably not necessary to adjust it. (Note) - 1000 cases of measurement results are stored. - When you uninstall CarTest, the stored measurement results will be deleted. - CarTest does not work on iPads without GPS. - If the GPS signal or device reception sensitivity is low, operation may become unstable. - If the starting acceleration is too small, it may not be measured correctly. - The developer assumes no responsibility for any accident, violation, loss or claims by third parties which may arise from the use of this app. Terms of Use: This application is provided under the Apple Standard End User License Agreement (EULA). https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Measure 0-60 mph and 0-1/4 mile times - Track acceleration on public roads - Repeatable measurements with Start/Sensing - Countdown start with false start detection - View and share previous results - Selectable speed units (km/h or mph) ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Feature enhancements | $5.99 | per year | | Feature enhancements | $3.99 | per 3 months | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Feature enhancements | $9.99 | one-time | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/cartest-performance-tester/id1534136951/reviews.md ### 5/5 — Love This App! *2025-10-29* Super fun to use and surprisingly accurate! I use it every time I test my car’s performance. Simple; clean, and works great! **Developer response:** Thank you so much! We’re really glad you’re enjoying the app and finding it accurate. Your feedback means a lot, and we’ll keep improving CarTest! ### 5/5 — Very good! *2025-08-23* This app is really helpful and really nice. **Developer response:** Thank you so much for your kind words! We’re really glad to hear that CarTest is helpful and enjoyable for you. 🚗💨✨ ### 1/5 — Garbage *2025-01-14* Not accurate and free trial only measures to 30mph. **Developer response:** We’re sorry to hear that the app did not meet your expectations. The free version is limited to measuring up to 30mph, but the full version supports extended measurements such as 0–60mph and quarter-mile tests. Accuracy depends on factors such as GPS signal strength and phone mounting. If you’re open to sharing more details about your experience, we’d be happy to look into it and improve. ### 3/5 — Like it , but not user friendly *2023-09-01* It is difficult to operate the car and get the App to say « Start « at the same time. I’m still optimistic that it will work. **Developer response:** I have changed the ready state message. Thank you for your advice. --- After the message “Start at your timing / Ready" Is displayed at the center of the app, please start your car at your own timing. ### 5/5 — Works very well! *2023-06-01* Thanks! This is the best performance tester I’ve ever used. **Developer response:** Thank you very much! ### 1/5 — And ... STILL Does NOT Work! *2022-11-23* In response to the developers, second message… If that's how you get it to work without paying, it should make that more clear in the app but as I've already paid the $4.99 I can't test that part anymore. What I can tell you is that the app STILL does not work and never switches from " waiting for stop" to "ready, go" on my United States version iPhone 14 pro running the latest iOS version. It shows my speed correctly when I'm moving and then when I stop it shows 0mph and then if you tap the start button, it goes from showing 0mph to "waiting for stop" and then it never does anything else. Maybe it works on some other versions of iPhones, or some other versions of iOS or on some versions of phones in other countries. But on my United States, iPhone 14 Pro, it never says "ready to go", you can sit there for as long as you want, and it'll simply keep saying "waiting for stop" even though I'm already stopped. I really wanted to work, maybe you could look into it, maybe there's something in the coding between different versions of the phone or different countries but on my phone here in the United States it absolutely does not work. I know the GPS works because it shows my speed correctly when I'm moving and it shows me as 0mph when I stop. But as I said, when I hit the start button changes to "waiting for stop" and then it never does anything else. The developer wrote back in response to my first review and claimed that the app can measure some things without a payment, that is totally wrong: The moment you press the "start" button it immediately tells you that you must buy something. I even tried deleting and reinstalling it and after the reinstall, but prior to using the "restore purchase" It still tells you the same thing which is that you must pay a fee before you can do anything. Tomorrow I just tested this. Secondly, the developer said that when the car stops in the GPS shows 0 mph that the message will change from "waiting for stop" to "ready to go", this is also not correct. I can be sitting at an absolute complete stop and it will continue to say "waiting for stop" even though it shows my speed is 0mph and I am not moving at all. Maybe it's only on the iPhone 14 Pro, but this app still does not work and I stand by my first review, everything I said was accurate, the app is absolutely worthless until they fix the problem. IPhone 14 Pro: The app sounds like it's free, but it doesn't work at all until you pay in the app. Then, even if you do pay when you tell it to start the app displays "0mph / WAITING FOR STOP" when I am stopped. This is also on a bright sunny perfectly clear day was not a cloud in the sky, and a full five bars of cellular signal and full strength GPS signal. I don't know what the app is waiting for, but I am stopped. Even tried it in my house and sit the phone on a desktop and told her to start in it sits there forever with the same message "waiting for stop". So after paying in the app, it absolutely does not work or do anything at all except sit there is waiting for stop message when I am stopped. So it's totally Worthless! **Developer response:** The latest version 1.11.0 will work perfectly. Thank you very much for the feedback again. I have revised the answer. The app can measure 0-40mph or 0-60km/h or low without payment. After tapping Start button, “Function expansion” dialog appears, and tap “Cancel” button to start measurement without payment. If the GPS signal is weak, the operation may become unstable. When the car stops and “GPS 0mph” or “GPS 0km/h” is displayed at the left side of “CarTest” on the screen, the message” changes from Waiting for Stop" to “Ready Go!”. If the iPhone’s GPS function is working properly and the car is not moving, the speedometer will show “GPS 0mph” or “GPS 0km/h”. ----- Thank you very much for the feedback. The app can measure 0-40mph or 0-60km/h or low without payment. If the GPS signal is weak, the operation may become unstable. When the car stops and “GPS 0mph” or “GPS 0km/h” is displayed, the message” changes from "Waiting for Stop" to “Ready Go!”. ### 1/5 — Disappointing *2022-08-04* The update lag on the speedometer function is so bad that the acceleration timer is almost useless on anything faster than a London bus with a flat tire. **Developer response:** Thank you very much for the comment. The app can measure the acceleration performance of all cars and motorcycles, including super sports cars and racing cars. ### 3/5 — drag racingについて *2021-12-20* よく似たアプリのdrag racing を購入して使用していましが、使えなくなりました。もう使えなくなったのでしょうか？アプリ一覧にも出てきません。 **Developer response:** Drag Racingは公開中です。 よろしくお願いいたします。 ### 4/5 — 良くなった！ *2021-10-05* アップデートでとても良くなった！ バイクでもしっかり使えるようになった！感激！ **Developer response:** ありがとうございます❗️ ## Frequently asked questions about CarTest ### How do I use CarTest to measure acceleration? Fix your iPhone or iPad with GPS securely on your dashboard or motorcycle. Tap 'Start/Sensing' for repeated measurements or 'Start/Countdown' for timed starts with false start detection. Follow on-screen instructions to begin. ### What types of measurements can CarTest perform? CarTest can measure various acceleration ranges, including 0-20 km/h up to unlimited in 20 km/h increments, 0-400m, and 0-1km. For mph, it measures 0-10 mph up to unlimited in 10 mph increments, 0-1/4 mile, and 0-1 km, along with max speed. ### Can CarTest be used on motorcycles? Yes, CarTest can be used on motorcycles. It is recommended to install the device on the handlebar or fuel tank to ensure it does not wobble during measurement. ### Does CarTest work on all iPads? CarTest requires a GPS-enabled device. It will not work on iPads that do not have GPS functionality. ### How many measurement results can CarTest store? CarTest can store up to 1000 measurement results. Please note that uninstalling the app will delete all stored measurement data. ### Can I adjust the sensitivity of the start sensor in CarTest? Yes, you can adjust the start-sensor sensitivity. In the stopped state, tap 'Stop' → '▲Next' → '▼ Prev' → '▲Next' → '▲Next' to open the setting window and select from 5 levels of sensitivity. ### What are the subscription plans for CarTest? CarTest offers subscription plans for feature enhancements. These include a 3-month plan for $3.99 and a 1-year plan for $5.99. ### Is CarTest suitable for safe driving on public roads? CarTest is useful for understanding usual acceleration on public roads for safe driving awareness. However, always prioritize safety and comply with all applicable laws when using the app on public roads. ## Version history (last 5 releases) ### 5.2.0 — 2026-06-30 Made minor improvements and enhanced performance. ### 5.1.1 — 2026-05-28 Made minor improvements and enhanced performance. ### 5.1.0 — 2026-04-27 Made minor improvements and enhanced performance. ### 5.0.3 — 2026-03-14 Made minor improvements and enhanced performance. ### 5.0.2 — 2026-03-01 Optimized battery usage for more efficient performance and longer sessions. 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*