# PerfectPower vs Dyno Chart

The clearest difference is review sentiment: PerfectPower at 95% against Dyno Chart's 20%. PerfectPower also leads on in-app purchases (none vs 1). Dyno Chart's advantage is price (Free vs $33.00) and iOS requirement (7.0 vs 12.0). On update cadence, ads and device support there is nothing between them.

Dyno Chart is free to download; PerfectPower costs $33.00 up front. Dyno Chart sells 1 one-off in-app purchase. PerfectPower asks for nothing beyond the download.

PerfectPower ships an update every 2 months, Dyno Chart every 3 months. The most recent releases landed on September 21, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | PerfectPower | Dyno Chart |
| --- | --- | --- |
| Price | $33.00 | **Free** |
| Rating | — | **[1.2 (6 ratings)](https://appshunter.io/ios/app/dyno-chart-obd-ii-engine-performance-tool/id602676538/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | **95.0% of reviews** | 20.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 3 MB | 9 MB |
| Requires iOS | 12.0 | **7.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [La maison de Spinoza](https://appshunter.io/developer/539294041) | [K SOLUTION LLC](https://appshunter.io/developer/289670447) |

## What reviewers say

### PerfectPower

[App page](https://appshunter.io/ios/app/perfectpower/id539294038)

This app provides professional-grade automotive power and performance measurements using your smartphone's sensors. It offers unparalleled accuracy and a wide range of features for measuring acceleration, speed, power, and torque, all without external equipment.

**Highlights:** Measure engine power (DIN, CEE, SAE, JIS, ISO), Measure performance (accelerations, speed, braking), Simulate performance metrics, Calculate gearbox ratios, Measure lap times on track, High accuracy sensor combination

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is PerfectPower free?

PerfectPower costs $33.00, with no in-app purchases.

### Is Dyno Chart free?

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

### Do PerfectPower or Dyno Chart have ads?

Neither PerfectPower nor Dyno Chart shows ads.

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

PerfectPower ships an update every 2 months, and Dyno Chart every 3 months. Most recently, PerfectPower was updated on September 21, 2026 and Dyno Chart on September 24, 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.*