# G^N vs equivalence principle

The clearest difference is price: equivalence principle at Free against G^N's $2.99. equivalence principle also leads on in-app purchases (none vs 1). G^N's advantage is iOS requirement (9.0 vs 16.0). On ads and device support there is nothing between them.

equivalence principle is free to download; G^N costs $2.99 up front. G^N sells 1 one-off in-app purchase. equivalence principle asks for nothing beyond the download.

## The numbers

| Metric | G^N | equivalence principle |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 4 MB | 0 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Johannes Loeffler](https://appshunter.io/developer/967323440) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### G^N

[App page](https://appshunter.io/ios/app/gn/id1049422307)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Levels | $9.99 | one-time |


### equivalence principle

[App page](https://appshunter.io/ios/app/equivalence-principle/id6670335382)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is G^N free?

G^N costs $2.99, and also offers in-app purchases.

### Is equivalence principle free?

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

### Do G^N or equivalence principle have ads?

Neither G^N nor equivalence principle 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.*