TSD Rally Computer vs CarTest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TSD Rally Computer
This app assists in navigating traditional time-speed-distance automobile rallies that require manual odometer entry. It simplifies complex calculations, allowing drivers to accurately track their progress and maintain the required speeds. Features include customizable time and distance measurements, odometer calibration, and real-time speed comparisons.
- Manual odometer entry for TSD rallies
- Odometer calibration
- Customizable time and distance units
- Real-time speed comparison with 'Speed Up'/'Slow Down' indicators
- MFi controller support
- Adjustable internal clock
- Preselect next speed changes
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TSD Rally Computer is an iPad app designed to simplify computations necessary to navigate a traditional time-speed-distance (TSD) automobile rally that requires manual entry of odometer distance. A TSD rally is comprised of stages set along a route defined by written instructions. The first stage is the Odometer Check stage that allows you to calibrate your car’s odometer with that of the Rallymaster’s odometer. In later stages you will follow a course at a particular average speed that will change from time to time at places that are generally unknown in advance. In order to drive the course at the prescribed speeds, you must keep track of your odometer reading along the way. You may get the odometer measurement from any external GPS or odometer or app you like. Apple-approved MFi game controllers can be used with the TSD Rally Computer when connected via Bluetooth. The TSD Rally Computer allows you to do all this and much, much more. For additional documentation, download the User’s Guide. Features of the TSD Rally Computer: - Clock time in either minutes and seconds to tenths of a second or decimal minutes to thousandths of a minute - The clock is a 24-hour clock to simplify computations - Distance measurements in either miles or kilometers - One button click to reset default conditions for starting a rally - The internal iPad clock can be adjusted to match the official rally clock - The car's odometer reads up to 99.99 miles or kilometers and can be incremented by simple button clicks including buttons to increment by one of four amounts shown in the selector below the odometer. The optional amounts are 1.00, 0.50, 0.10, and 0.01 - A "Settings" button in the top menu bar allows access to the app settings from within the running application including settings for display of certain items - Calibrate the car's odometer to the official rally odometer on the odometer check stage via a popup - Change average speed (CAST) with a scroll wheel and make incremental changes with either of two buttons - Preselect the next CAST to simplify the process of changing speed on each leg - The CAST button can be deactivated to prevent accidental touching - Preset CAST speeds and times to travel one mile or kilometer at those speeds with via a popup - Use scroll wheels to quickly and easily change time, speed, or distance throughout the app - As time passes and as the car's odometer is incremented, the actual speed over the course is compared with the expected speed. The difference in seconds or hundredths of a minute is displayed along with an indication to either "Speed Up" or "Slow Down" to stay on pace - Pause or gain time on any leg with a toggle button and at times chosen with scroll wheels - Handle off-course corrections to time and distance with a toggle button - Record "splits" of time and error at any time with a Control button - Set Next Departure Time (NDT) and have the time tick down on the master clock and autostart CAST - Use a handy popup to perform ad hoc computations of time, speed, and distance given any other two variables - TSD Remote is a companion heads-up display app for the driver that synchs information with the navigator's TSD Rally Computer - Apple-approved game controllers are supported via Bluetooth - A pair of stopwatches with pause and split times may be operated at any time. You may toggle between each stopwatch with the touch of a button. Note: Use of the TSD Rally Computer during any particular rally will be subject to the rules and instructions governing the rally and may also define your category or class among race participants. Some rallies may, in fact, prohibit use of this app.
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 price: CarTest at Free against TSD Rally Computer's $24.99. CarTest also leads on review sentiment (44% vs 0%) and rating (4.2 vs 2.0). TSD Rally Computer's advantage is in-app purchases (none vs 3) and ads (none vs shown).
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
CarTest is free to download; TSD Rally Computer costs $24.99 up front. CarTest sells 3 in-app purchases, starting at $3.99 per 3 months. TSD Rally Computer asks for nothing beyond the download.
CarTest holds the better App Store score, 4.2 against 2.0. That said, the two scores are not equally well evidenced: CarTest has 13 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of TSD Rally Computer's written reviews are positive against 44% of CarTest's.
TSD Rally Computer ships an update every 3 months, CarTest monthly. The most recent releases landed on October 23, 2026 and November 3, 2026 respectively.
| Parameter | TSD Rally Computer | CarTest |
|---|---|---|
| Price | $24.99 | Free — better |
| Rating | 2.0 (2 ratings) | 4.2 (13 ratings) — better |
| Positive reviews | 0.0% of reviews | 44.4% of reviews — better |
| Number of ratings | 2 | 13 — better |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | MSYapps | Takao Ichimura |
Customer experience
TSD Rally Computer
CarTest
In-app purchases
TSD Rally Computer
No in-app purchases
CarTest
- Feature enhancements$3.993 Months
- Feature enhancements$5.991 Year
- Feature enhancements$9.99









