# E4Keys vs More Rationalizing Denominator

The clearest difference is in-app purchases: More Rationalizing Denominator at none against E4Keys's 3. More Rationalizing Denominator also leads on iOS requirement (12.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. E4Keys sells 3 in-app purchases, starting at $1.99 per month. More Rationalizing Denominator asks for nothing beyond the download.

## The numbers

| Metric | E4Keys | More Rationalizing Denominator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | — |
| Size | 46 MB | 32 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CARLOS GOMES DE OLIVEIRA](https://appshunter.io/developer/1576926646) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### E4Keys

[App page](https://appshunter.io/ios/app/e4keys/id1604234563)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Assinatura Mensal | $1.99 | per month |
| Assinatura Semestral | $9.99 | per 6 months |
| Assinatura Anual | $14.99 | per year |


### More Rationalizing Denominator

[App page](https://appshunter.io/ios/app/more-rationalizing-denominator/id6741186409)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is E4Keys free?

E4Keys is free to download, with in-app purchases available.

### Is More Rationalizing Denominator free?

More Rationalizing Denominator is free to download, with no in-app purchases.

### Do E4Keys or More Rationalizing Denominator have ads?

Neither E4Keys nor More Rationalizing Denominator shows ads.

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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.*