# Ratio Calc! vs MD Binary

The clearest difference is price: MD Binary at Free against Ratio Calc!'s $2.99. MD Binary also leads on in-app purchases (none vs 4) and update cadence (every 4 days vs every 3 months). On ads and device support there is nothing between them.

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

Ratio Calc! ships an update every 3 months, MD Binary every 4 days. The most recent releases landed on September 23, 2026 and June 8, 2026 respectively.

## The numbers

| Metric | Ratio Calc! | MD Binary |
| --- | --- | --- |
| 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 3 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 46 MB | 11 MB |
| Requires iOS | 16.6 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Mills](https://appshunter.io/developer/395985551) | [Marco Sbragi](https://appshunter.io/developer/1056694879) |

## 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 |


### MD Binary

[App page](https://appshunter.io/ios/app/md-binary/id6448985246)

**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 MD Binary free?

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

### Do Ratio Calc! or MD Binary have ads?

Neither Ratio Calc! nor MD Binary shows ads.

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

Ratio Calc! ships an update every 3 months, and MD Binary every 4 days. Most recently, Ratio Calc! was updated on September 23, 2026 and MD Binary on June 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*