# PerfectPower vs Harry's Dyno

The clearest difference is review sentiment: PerfectPower at 95% against Harry's Dyno's 0%. Harry's Dyno's advantage is price ($3.99 vs $33.00). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

PerfectPower costs $33.00 and Harry's Dyno $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PerfectPower ships an update every 2 months, Harry's Dyno every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | PerfectPower | Harry's Dyno |
| --- | --- | --- |
| Price | $33.00 | **$3.99** |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/harrys-dyno/id1148400332/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | **95.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | Paid |
| Size | 3 MB | 41 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [La maison de Spinoza](https://appshunter.io/developer/539294041) | [Harald Schlangmann](https://appshunter.io/developer/307688601) |

## 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


### Harry's Dyno

[App page](https://appshunter.io/ios/app/harrys-dyno/id1148400332)

Measure vehicle performance with high precision using GPS and OBD sensors. Test acceleration and deceleration across custom speed ranges, analyze detailed results, and store data locally. Supports external sensors for enhanced accuracy.

**Highlights:** GPS and OBD sensor integration, Custom speed range testing (acceleration/deceleration), Detailed results analysis, Two-cursor data inspection, Local data storage and filtering, Data export to various formats

**In-app purchases:** none


## Frequently asked questions

### Is PerfectPower free?

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

### Is Harry's Dyno free?

Harry's Dyno costs $3.99, with no in-app purchases.

### Do PerfectPower or Harry's Dyno have ads?

Neither PerfectPower nor Harry's Dyno shows ads.

### Which is updated more often, PerfectPower or Harry's Dyno?

PerfectPower ships an update every 2 months, and Harry's Dyno every 3 months. Most recently, PerfectPower was updated on October 24, 2026 and Harry's Dyno on October 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.*