# Top Derm vs Derm DDx

The clearest difference is in-app purchases: Top Derm at none against Derm DDx's 1. Top Derm also leads on rating (4.5 vs 4.0) and update cadence (every 6 weeks vs every 5 months). Derm DDx's advantage is ads (none vs shown) and chart position (#194 vs unranked). On price, monetization model, device support and iOS requirement there is nothing between them.

Both are free to download. Derm DDx sells 1 one-off in-app purchase. Top Derm asks for nothing beyond the download.

Top Derm holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Top Derm has 59 ratings behind it against 4, so its average is the more settled of the two.

Top Derm ships an update every 6 weeks, Derm DDx every 5 months. The most recent releases landed on June 1, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Top Derm | Derm DDx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (59 ratings)](https://appshunter.io/ios/app/top-derm/id1505608766/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/derm-ddx/id6499524221/reviews) |
| Number of ratings | **59** | 4 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 5 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | **#194** |
| Size | 248 MB | 10 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Relevate Health Group, LLC](https://appshunter.io/developer/1786280213) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## What reviewers say

### Top Derm

[App page](https://appshunter.io/ios/app/top-derm/id1505608766)

This game is designed for dermatologists by dermatologists, offering a fun and challenging way to learn and identify skin disorders. It features medically accurate imagery and neuroscience-based game mechanics to enhance knowledge retention.

**Highlights:** Medically accurate derm imagery, Neuroscience-based game mechanics, Earn CME credits, Wide variety of dermatology topics, Customizable topic selection, High-resolution imagery with zoom, Personal expertise tracking

**Features:** macOS Compatibility

**In-app purchases:** none


### Derm DDx

[App page](https://appshunter.io/ios/app/derm-ddx/id6499524221)

**Currently charting:** #194 Top Grossing · Medical (US App Store)

This app provides visual, point-of-care guidance for diagnosing skin disorders. It features a large database of high-resolution images, allowing users to compare variations, zoom in, and access clinical history and treatment options for over 160 dermatologic conditions.

**Highlights:** 650+ high-quality dermatology images, Guidance for 160+ dermatologic conditions, Side-by-side image variations, Zoomable high-resolution images, Clinical history and treatment options, Cross-referencing to differential diagnoses, Full text search and custom notes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dermatology DDx | $69.99 | one-time |


## Frequently asked questions

### Is Top Derm free?

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

### Is Derm DDx free?

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

### Which has better reviews, Top Derm or Derm DDx?

Top Derm is rated higher. Top Derm averages 4.5 out of 5 from 59 ratings, while Derm DDx averages 4.0 from 4 ratings.

### Do Top Derm or Derm DDx have ads?

Top Derm shows ads; Derm DDx does not.

### Which is updated more often, Top Derm or Derm DDx?

Top Derm ships an update every 6 weeks, and Derm DDx every 5 months. Most recently, Top Derm was updated on June 1, 2026 and Derm DDx on September 18, 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.*