# Harry's Dyno vs R

The clearest difference is price: R at Free against Harry's Dyno's $3.99. R also leads on update cadence (fortnightly vs every 3 months). Harry's Dyno's advantage is ads (none vs shown) and iOS requirement (12.0 vs 14.0). On in-app purchases and device support there is nothing between them.

R is free to download; Harry's Dyno costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Harry's Dyno ships an update every 3 months, R fortnightly. The most recent releases landed on September 18, 2026 and July 17, 2026 respectively.

## The numbers

| Metric | Harry's Dyno | R |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/harrys-dyno/id1148400332/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 41 MB | 154 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Harald Schlangmann](https://appshunter.io/developer/307688601) | [R-EX MOTORSPORTS LTD](https://appshunter.io/developer/1620549213) |

## What reviewers say

### 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


### R

[App page](https://appshunter.io/ios/app/r-ex/id1620549211)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Harry's Dyno free?

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

### Is R free?

R is free to download, with no in-app purchases.

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

R shows ads; Harry's Dyno does not.

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

Harry's Dyno ships an update every 3 months, and R fortnightly. Most recently, Harry's Dyno was updated on September 18, 2026 and R on July 17, 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.*