# EDF vs Barnhill's Derm. Challenge

The clearest difference is price: EDF at Free against Barnhill's Derm. Challenge's $99.99. Barnhill's Derm. Challenge's advantage is update cadence (every 3 months vs every 7 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

EDF is free to download; Barnhill's Derm. Challenge costs $99.99 up front. Neither carries in-app purchases, so what you see is what you pay.

EDF ships an update every 7 months, Barnhill's Derm. Challenge every 3 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | EDF | Barnhill's Derm. Challenge |
| --- | --- | --- |
| Price | **Free** | $99.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Size | 2 MB | 559 MB |
| Requires iOS | **9.0** | 10.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [swiss4ward Europe S.L.](https://appshunter.io/developer/1012882836) | [Usatine & Erickson Media LLC](https://appshunter.io/developer/1466894388) |

## What reviewers say

### EDF

[App page](https://appshunter.io/ios/app/edf-guidelines/id1012882837)

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

**In-app purchases:** none


### Barnhill's Derm. Challenge

[App page](https://appshunter.io/ios/app/barnhills-derm-challenge/id1262836993)

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

**In-app purchases:** none


## Frequently asked questions

### Is EDF free?

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

### Is Barnhill's Derm. Challenge free?

Barnhill's Derm. Challenge costs $99.99, with no in-app purchases.

### Do EDF or Barnhill's Derm. Challenge have ads?

Neither EDF nor Barnhill's Derm. Challenge shows ads.

### Which is updated more often, EDF or Barnhill's Derm. Challenge?

EDF ships an update every 7 months, and Barnhill's Derm. Challenge every 3 months. Most recently, EDF was updated on October 26, 2026 and Barnhill's Derm. Challenge on October 27, 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.*