iTSX vs CarTest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iTSX
Tune and monitor your vehicle's performance using your iPhone or iPad. This app requires a specific wireless OBD-II interface to adjust engine parameters, view real-time data, and run performance tests. It also allows for reading and clearing diagnostic trouble codes.
- Vehicle programming for performance gains
- Pre-loaded dyno-proven tunes
- Adjustable speed limiter
- Virtual gauges and data monitoring
- Record and review data logs
- Performance tests (0-60, 1/4 mile)
- Read and clear diagnostic trouble codes
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TUNE YOUR VEHICLE WITH YOUR iPHONE / iPAD! NOTE: This app requires the iTSX Wireless OBD-II Interface. Visit https://sctflash.com/Products/unfiltered-product/sct/SCTITSX/sct-itsx for more information. The iTSX App lets you control the vehicle-tuning and monitoring capabilities of the iTSX Wireless OBD-II Interface... the first & only “Made for iPod – iPhone – iPad” vehicle tuner & OBD-II monitoring product on the market. The iTSX Wireless OBD-II Interface plugs into your vehicle’s OBD-II diagnostic connector, and communicates with your Apple device via a secure Bluetooth wireless connection. When used with the iTSX Wireless OBD-II Interface, the iTSX App provides the following features: VEHICLE PROGRAMMING • Increase your vehicle’s Performance in Minutes • Works with 1996 - 2012 Ford Gas & Diesel vehicles • Works with popular GM vehicles (see What's New) • Pre-Loaded Dyno Proven Tunes for the Most Popular vehicles • Re-Calibrates the Vehicle using Bluetooth Wireless Technology • Ability to set your vehicle’s Speed Limiter for young drivers VIRTUAL GAUGES / DATA MONITORING / DATA LOGGING • On-Screen Virtual Gauges with Adjustable Warning / Alert lights • Monitor Vehicle Engine Data / Parameters via Virtual Gauges • Record & Review Recorded Data Logs • Huge Virtual Gauges on iPad VEHICLE PERFORMANCE TESTS • 0-60MPH Test: Virtual Speedometer & Graph with Estimated Horsepower • ET / MPH Test: 1/8th mile & 1/4 mile ET / MPH with Estimated Horsepower • Top Speed Test • Braking Test VEHICLE DIAGNOSTICS • Reads & Clears Vehicle Diagnostic Trouble Codes ( Check Engine Light ) • Diagnose your vehicle’s Diagnostic Trouble Codes using your mobile device
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)
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"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 iTSX's 2.3. CarTest also leads on review sentiment (44% vs 24%) and update cadence (monthly vs every 2 months). iTSX's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price and device support 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. CarTest sells 3 in-app purchases, starting at $3.99 per 3 months. iTSX asks for nothing beyond the download.
CarTest holds the better App Store score, 4.2 against 2.3. Both are backed by a comparable volume of ratings — 45 and 13 respectively. Written reviews point the same way: 24% of iTSX's written reviews are positive against 44% of CarTest's.
iTSX ships an update every 2 months, CarTest monthly. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.
| Parameter | iTSX | CarTest |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (45 ratings) | 4.2 (13 ratings) — better |
| Positive reviews | 24.5% of reviews | 44.4% of reviews — better |
| Number of ratings | 45 — better | 13 |
| Update frequency | Every 2 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 35 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | SCT Performance | Takao Ichimura |
Customer experience
iTSX
CarTest
In-app purchases
iTSX
No in-app purchases
CarTest
- Feature enhancements$3.993 Months
- Feature enhancements$5.991 Year
- Feature enhancements$9.99








