# Diagnosaurus® DDx vs QuickEM

The clearest difference is price: Diagnosaurus® DDx at Free against QuickEM's $9.99. Diagnosaurus® DDx also leads on ratings volume (2.5K vs 10) and rating (4.8 vs 4.6). QuickEM's advantage is review sentiment (91% vs 53%) and update cadence (every 2 months vs every 10 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Diagnosaurus® DDx is free to download; QuickEM costs $9.99 up front. Diagnosaurus® DDx sells 1 one-off in-app purchase and QuickEM sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Diagnosaurus® DDx holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 53% of Diagnosaurus® DDx's written reviews are positive against 91% of QuickEM's, so the app with the better star average is not the one people write more warmly about.

Diagnosaurus® DDx ships an update every 10 months, QuickEM every 2 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | Diagnosaurus® DDx | QuickEM |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews)** | [4.6 (10 ratings)](https://appshunter.io/ios/app/quickem/id930734530/reviews) |
| Number of ratings | **2.5K** | 10 |
| Positive reviews | 53.2% of reviews | **90.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#16** |
| Size | 19 MB | 78 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Dirkes Medical, PLLC](https://appshunter.io/developer/1668683062) |

## What reviewers say

### Diagnosaurus® DDx

[App page](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910)

This medical reference tool assists healthcare professionals in performing differential diagnoses quickly and confidently. It offers a searchable database of over 1,000 diagnoses, cross-referenced for related conditions, and allows users to save favorite entries and make custom notes.

**Highlights:** Over 1,000 differential diagnoses, Search by organ system, symptom, or disease, See Related DDx feature, Save favorite entries, Highlight and make custom notes, Universal Index Search

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diagnosaurus DDx | $4.99 | one-time |

**What reviewers like**

- 👍 User-friendly interface
- 🚀 Quick access to differential diagnoses
- 💡 Helpful for building differential diagnoses
- 👍 Comprehensive coverage of conditions
- 👍 Useful for medical students and practitioners

**What reviewers complain about**

- 🐛 Lack of in-depth information
- 🐛 Incomplete differential diagnoses
- 🐛 Lack of links to explain conditions
- 🐛 Requires in-app purchase to access full content
- 🐛 Unreliable update mechanism

**Reported bugs**

- Subscription issues and inability to restore purchases
- Blank pages and non-functional content
- Compatibility issues with newer iOS versions

**Requested features**

- Add ability to edit or add custom differential diagnoses
- Improve search functionality and navigation
- Provide more detailed information on conditions
- Integrate with other medical resources and databases
- Improve support for older devices and iOS versions


### QuickEM

[App page](https://appshunter.io/ios/app/quickem/id930734530)

**Currently charting:** #16 Top Paid · Medical (US App Store)

This emergency medicine reference app provides clinicians with instant access to critical information, including differentials, treatments, and validated medical calculators. It's designed for rapid lookup of ED-specific care, organized by chief complaints and clinical categories, and works completely offline.

**Highlights:** 80+ chief complaint topics, 90+ medical calculators, Offline access, No login or ads, Adult and pediatric coverage, Evidence-based content, Customizable favorites

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Features | $2.99 | one-time |


## Frequently asked questions

### Is Diagnosaurus® DDx free?

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

### Is QuickEM free?

QuickEM costs $9.99, and also offers in-app purchases.

### Which has better reviews, Diagnosaurus® DDx or QuickEM?

Diagnosaurus® DDx is rated higher. Diagnosaurus® DDx averages 4.8 out of 5 from 2.5K ratings, while QuickEM averages 4.6 from 10 ratings.

### Do Diagnosaurus® DDx or QuickEM have ads?

Neither Diagnosaurus® DDx nor QuickEM shows ads.

### Which is updated more often, Diagnosaurus® DDx or QuickEM?

Diagnosaurus® DDx ships an update every 10 months, and QuickEM every 2 months. Most recently, Diagnosaurus® DDx was updated on October 26, 2026 and QuickEM on October 26, 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.*