# Formula Conversion vs Element OTG

The clearest difference is in-app purchases: Element OTG at none against Formula Conversion's 1. Element OTG also leads on update cadence (monthly vs every 26 months). Formula Conversion's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

Formula Conversion ships an update every 26 months, Element OTG monthly. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Formula Conversion | Element OTG |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 26 months | **Monthly** |
| Size | 2 MB | 25 MB |
| Requires iOS | 14.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Janek Soomets](https://appshunter.io/developer/1315295062) | [Japality Limited](https://appshunter.io/developer/1574046707) |

## 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 |


### Element OTG

[App page](https://appshunter.io/ios/app/element-otg/id6749494404)

**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 Element OTG free?

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

### Do Formula Conversion or Element OTG have ads?

Element OTG shows ads; Formula Conversion does not.

### Which is updated more often, Formula Conversion or Element OTG?

Formula Conversion ships an update every 26 months, and Element OTG monthly. Most recently, Formula Conversion was updated on September 29, 2026 and Element OTG on October 3, 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.*