# Ratio Calc! vs Driveroom

The clearest difference is price: Driveroom at Free against Ratio Calc!'s $2.99. Driveroom also leads on in-app purchases (none vs 4) and iOS requirement (9.0 vs 17.0). On update cadence, ads and device support there is nothing between them.

Driveroom is free to download; Ratio Calc! costs $2.99 up front. Ratio Calc! sells 4 one-off in-app purchases. Driveroom asks for nothing beyond the download.

Ratio Calc! ships an update every 4 months, Driveroom every 2 months. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Ratio Calc! | Driveroom |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.5 (25 ratings)](https://appshunter.io/ios/app/ratio-calc/id436311293/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 10 MB |
| Requires iOS | 17.0 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Mills](https://appshunter.io/developer/395985551) | [Micro WS-KLT s.r.o.](https://appshunter.io/developer/1326129395) |

## What reviewers say

### Ratio Calc!

[App page](https://appshunter.io/ios/app/ratio-calc/id436311293)

This app helps radio control car racers calculate their final drive ratio and rollout. Easily select your car, input gear sizes, and get instant results. It also offers charts and saves favorite cars for quick access.

**Highlights:** Calculate Final Drive Ratio (FDR), Calculate Rollout with tire diameter, Filter cars by manufacturer and model, Save favorite cars, Select measurement units (imperial/metric), Select gear pitch, View ratio and rollout charts

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nice Tip | $0.99 | one-time |
| Generous Tip | $2.99 | one-time |
| Mega Tip | $4.99 | one-time |
| Insane Tip | $9.99 | one-time |

**What reviewers like**

- 👍 Excellent for RC gear ratios
- 👍 Great database of cars
- 👍 Simple and easy to use
- 👍 Invaluable at the track
- 👍 Time saver

**What reviewers complain about**

- 🐛 Latest version unusable
- 🐛 Cannot adjust tyre sizes
- 🐛 Cannot adjust gear ratio
- 🐛 Removed notes feature
- 🐛 Removed ability to save same vehicle twice

**Reported bugs**

- Cannot adjust tyre sizes in latest version
- Cannot adjust gear ratio in latest version
- Bug on iPad: 'done' button missing after setting pinion/spur
- Removed notes feature in latest update
- Removed ability to save same vehicle twice in latest update

**Requested features**

- Add Mod 1 pinions and spurs
- Add support for 1:8 e-buggies
- Reintroduce notes feature
- Reintroduce ability to save same vehicle twice
- Add iCloud backup or import/export feature


### Driveroom

[App page](https://appshunter.io/ios/app/driveroom/id1326129396)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ratio Calc! free?

Ratio Calc! costs $2.99, and also offers in-app purchases.

### Is Driveroom free?

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

### Do Ratio Calc! or Driveroom have ads?

Neither Ratio Calc! nor Driveroom shows ads.

### Which is updated more often, Ratio Calc! or Driveroom?

Ratio Calc! ships an update every 4 months, and Driveroom every 2 months. Most recently, Ratio Calc! was updated on October 12, 2026 and Driveroom on October 8, 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.*