# Racing Diffs vs RC Speed Calculator Pro

The clearest difference is rating: RC Speed Calculator Pro at 4.9 against Racing Diffs's 2.5. RC Speed Calculator Pro also leads on update cadence (fortnightly vs every 5 weeks) and ratings volume (23 vs 2). Racing Diffs's advantage is iOS requirement (14.4 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RC Speed Calculator Pro holds the better App Store score, 4.9 against 2.5. That said, the two scores are not equally well evidenced: RC Speed Calculator Pro has 23 ratings behind it against 2, so its average is the more settled of the two.

Racing Diffs ships an update every 5 weeks, RC Speed Calculator Pro fortnightly. The most recent releases landed on October 13, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Racing Diffs | RC Speed Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (2 ratings)](https://appshunter.io/ios/app/racing-diffs-gear-ratio/id1554897307/reviews) | **[4.9 (23 ratings)](https://appshunter.io/ios/app/rc-speed-calculator-pro/id6445860835/reviews)** |
| Number of ratings | 2 | **23** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 6 MB | 160 MB |
| Requires iOS | **14.4** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| 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 Speed Calculator Pro

[App page](https://appshunter.io/ios/app/rc-speed-calculator-pro/id6445860835)

Estimate your RC car's top speed by inputting details about its gearing, motor, and batteries. Record your estimates and actual speeds to compare different setups.

**Highlights:** Estimate RC car top speed, Input gearing, motor, and battery info, Record speed estimates, Log actual top speeds, Compare different car setups, Pre-filled car data

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

**In-app purchases:** none


## Frequently asked questions

### Is Racing Diffs free?

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

### Is RC Speed Calculator Pro free?

RC Speed Calculator Pro is free to download, with no in-app purchases.

### Which has better reviews, Racing Diffs or RC Speed Calculator Pro?

RC Speed Calculator Pro is rated higher. Racing Diffs averages 2.5 out of 5 from 2 ratings, while RC Speed Calculator Pro averages 4.9 from 23 ratings.

### Do Racing Diffs or RC Speed Calculator Pro have ads?

Neither Racing Diffs nor RC Speed Calculator Pro shows ads.

### Which is updated more often, Racing Diffs or RC Speed Calculator Pro?

Racing Diffs ships an update every 5 weeks, and RC Speed Calculator Pro fortnightly. Most recently, Racing Diffs was updated on October 13, 2026 and RC Speed Calculator Pro on October 22, 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.*