# Dyno Chart vs CarTest

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.

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.

## The numbers

| Metric | Dyno Chart | CarTest |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.2 (6 ratings)](https://appshunter.io/ios/app/dyno-chart-obd-ii-engine-performance-tool/id602676538/reviews) | **[4.2 (13 ratings)](https://appshunter.io/ios/app/cartest-performance-tester/id1534136951/reviews)** |
| Number of ratings | 6 | **13** |
| Positive reviews | 20.0% of reviews | **44.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 9 MB | 8 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [K SOLUTION LLC](https://appshunter.io/developer/289670447) | [Takao Ichimura](https://appshunter.io/developer/1474061593) |

## What reviewers say

### Dyno Chart

[App page](https://appshunter.io/ios/app/dyno-chart-obd-ii-engine-performance-tool/id602676538)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dyno Chart Unlock | $4.99 | one-time |


### CarTest

[App page](https://appshunter.io/ios/app/cartest-performance-tester/id1534136951)

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.

**Highlights:** 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)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Feature enhancements | $3.99 | per 3 months |
| Feature enhancements | $5.99 | per year |
| Feature enhancements | $9.99 | one-time |


## Frequently asked questions

### Is Dyno Chart free?

Dyno Chart is free to download, with in-app purchases available.

### Is CarTest free?

CarTest is free to download, with in-app purchases available.

### Which has better reviews, Dyno Chart or CarTest?

CarTest is rated higher. Dyno Chart averages 1.2 out of 5 from 6 ratings, while CarTest averages 4.2 from 13 ratings.

### Do Dyno Chart or CarTest have ads?

CarTest shows ads; Dyno Chart does not.

### Which is updated more often, Dyno Chart or CarTest?

Dyno Chart ships an update every 3 months, and CarTest monthly. Most recently, Dyno Chart was updated on October 24, 2026 and CarTest on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*