# Racing Diffs vs RC Pit Calc Pro

The clearest difference is rating: RC Pit Calc Pro at 4.4 against Racing Diffs's 2.5. RC Pit Calc Pro also leads on update cadence (every 4 days vs every 5 weeks) and ratings volume (25 vs 2). Racing Diffs's advantage is in-app purchases (none vs 2). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. RC Pit Calc Pro sells 1 one-off in-app purchase. Racing Diffs asks for nothing beyond the download.

RC Pit Calc Pro holds the better App Store score, 4.4 against 2.5. That said, the two scores are not equally well evidenced: RC Pit Calc Pro has 25 ratings behind it against 2, so its average is the more settled of the two.

Racing Diffs ships an update every 5 weeks, RC Pit Calc Pro every 4 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | Racing Diffs | RC Pit Calc Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (2 ratings)](https://appshunter.io/ios/app/racing-diffs-gear-ratio/id1554897307/reviews) | **[4.4 (25 ratings)](https://appshunter.io/ios/app/rc-pit-calc-pro/id1562268871/reviews)** |
| Number of ratings | 2 | **25** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Monetization | Free | Free |
| Size | 6 MB | 60 MB |
| Requires iOS | **14.4** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Imperio](https://appshunter.io/developer/521569345) | [Degree3, Inc.](https://appshunter.io/developer/1497876563) |

## What reviewers say

### Racing Diffs

[App page](https://appshunter.io/ios/app/racing-diffs-gear-ratio/id1554897307)

Calculate your vehicle's top speed for each gear using transmission ratios, differential gear ratio, and rev limit. Optimize your car's gear ratio for track performance or drag racing, choosing between kmh and mph units.

**Highlights:** Top speed calculation per gear, Input tire dimensions, Input transmission gear ratios, Input final drive ratio, Input rev limit, Supports kmh and mph

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

**In-app purchases:** none


### RC Pit Calc Pro

[App page](https://appshunter.io/ios/app/rc-pit-calc-pro/id1562268871)

This app provides a comprehensive suite of calculators for radio-controlled car enthusiasts. It helps with gear ratios, suspension geometry, top speed estimates, and shock oil calculations, offering detailed insights for racers and hobbyists.

**Highlights:** Gear ratio and FDR calculation, Pinion and top speed recommendation, Suspension geometry analysis, Corner weight and CG height measurement, Shock oil and damping calculations, Fuel usage estimation

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Backer | $4.99 | one-time |


## Frequently asked questions

### Is Racing Diffs free?

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

### Is RC Pit Calc Pro free?

RC Pit Calc Pro is free to download, with in-app purchases available.

### Which has better reviews, Racing Diffs or RC Pit Calc Pro?

RC Pit Calc Pro is rated higher. Racing Diffs averages 2.5 out of 5 from 2 ratings, while RC Pit Calc Pro averages 4.4 from 25 ratings.

### Do Racing Diffs or RC Pit Calc Pro have ads?

Neither Racing Diffs nor RC Pit Calc Pro shows ads.

### Which is updated more often, Racing Diffs or RC Pit Calc Pro?

Racing Diffs ships an update every 5 weeks, and RC Pit Calc Pro every 4 days. Most recently, Racing Diffs was updated on November 3, 2026 and RC Pit Calc Pro on November 3, 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.*