Dyno Chart vs CarTest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dyno Chart
This tool analyzes your vehicle's engine performance, displaying max power and torque against RPM. It connects via an OBD II adapter to gather sensor data and generate detailed charts. Ensure compatibility before unlocking full features.
- Max power and torque vs RPM charts
- OBD II sensor data collection
- Vehicle compatibility check
- ELM Wi-Fi/Bluetooth LE adapter support
- In-app chart function unlock
Read full descriptionHide full description
Dyno Chart is vehicle engine performance evaluation tool, which provides you the information of max power and torque vs RPM. Dyno Chart app uses OBD II interface on your vehicle to collect sensor data and build the chart. Please follow the app instruction for compatibility check before you purchase and unlock the in-app chart function. The app needs an ELM compatible Wi-Fi or Bluetooth Low Energy (for iPhone4s and later) adapter to work. You can check Developer WebSite for Adapter Guide: http://www.outdoor-apps.com/enginelink.html Drop us an email for any suggestions/questions you may have at support@ksolution.org. We will answer.
CarTest
Measure your vehicle's acceleration performance with this tool. Easily track times like 0-60 mph or 0-1/4 mile. Useful for performance testing and safe driving awareness on public roads.
- 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)
Read full descriptionHide full description
"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. - < Prev: Displays older results. - Next >: Displays results newer than the past results displayed by clicking the "< Prev" button. - 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" → "< Prev" → "Next >" → "< Prev" → "< Prev" 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/
Screenshots
Verdict
The clearest difference is rating: CarTest at 4.2 against Dyno Chart's 1.2. CarTest also leads on review sentiment (44% vs 20%) and update cadence (monthly vs every 3 months). Dyno Chart's advantage is ads (none vs shown) and iOS requirement (7.0 vs 15.0). On price, ratings volume, in-app purchases and monetization model 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
Both are free to download. Dyno Chart sells 1 one-off in-app purchase and CarTest sells 3 in-app purchases, starting at $3.99 per 3 months. Whichever you choose, the download price is not the number that matters.
CarTest holds the better App Store score, 4.2 against 1.2. Both are backed by a comparable volume of ratings — 6 and 13 respectively. Written reviews point the same way: 20% of Dyno Chart's written reviews are positive against 44% of CarTest's.
Dyno Chart ships an update every 3 months, CarTest monthly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Dyno Chart | CarTest |
|---|---|---|
| Price | Free | Free |
| Rating | 1.2 (6 ratings) | 4.2 (13 ratings) — better |
| Positive reviews | 20.0% of reviews | 44.4% of reviews — better |
| Number of ratings | 6 | 13 — better |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 7.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 9 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | K SOLUTION LLC | Takao Ichimura |
Customer experience
Dyno Chart
CarTest
In-app purchases
Dyno Chart
- Dyno Chart Unlock$4.99
CarTest
- Feature enhancements$3.993 Months
- Feature enhancements$5.991 Year
- Feature enhancements$9.99









