# Ratio Calc! vs E

The clearest difference is update cadence: E at weekly against Ratio Calc!'s every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Ratio Calc! sells 4 one-off in-app purchases and E sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Ratio Calc! ships an update every 4 months, E weekly. Both last shipped on October 16, 2026.

## The numbers

| Metric | Ratio Calc! | E |
| --- | --- | --- |
| Price | Free | 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 | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 28 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [David Mills](https://appshunter.io/developer/395985551) | [Opticell Limited](https://appshunter.io/developer/1883824295) |

## 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


### E

[App page](https://appshunter.io/ios/app/e-grid/id6761284626)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Yearly | $9.99 | per year |


## Frequently asked questions

### Is Ratio Calc! free?

Ratio Calc! is free to download, with in-app purchases available.

### Is E free?

E is free to download, with in-app purchases available.

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

Neither Ratio Calc! nor E shows ads.

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

Ratio Calc! ships an update every 4 months, and E weekly. Most recently, Ratio Calc! was updated on October 16, 2026 and E on October 16, 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.*