# Formula Conversion vs iRelativity

The clearest difference is in-app purchases: iRelativity at none against Formula Conversion's 1. Formula Conversion's advantage is iOS requirement (14.1 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Formula Conversion sells 1 one-off in-app purchase. iRelativity asks for nothing beyond the download.

## The numbers

| Metric | Formula Conversion | iRelativity |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 26 months | — |
| Size | 2 MB | 1 MB |
| Requires iOS | **14.1** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Janek Soomets](https://appshunter.io/developer/1315295062) | [Vladimir Kostadinov Stoyanov](https://appshunter.io/developer/1776235767) |

## What reviewers say

### Formula Conversion

[App page](https://appshunter.io/ios/app/formula-conversion/id1586539965)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Formula Conversion | $3.99 | one-time |


### iRelativity

[App page](https://appshunter.io/ios/app/irelativity/id6776330770)

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

**In-app purchases:** none


## Frequently asked questions

### Is Formula Conversion free?

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

### Is iRelativity free?

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

### Do Formula Conversion or iRelativity have ads?

Neither Formula Conversion nor iRelativity 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.*