# WikEM vs Diagnosaurus® DDx

The clearest difference is update cadence: WikEM at every 5 days against Diagnosaurus® DDx's every 10 months. On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. WikEM sells 10 in-app purchases, starting at $1.99 per month and Diagnosaurus® DDx sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for WikEM against 4.8 for Diagnosaurus® DDx. Both are backed by a comparable volume of ratings — 4.8K and 2.5K respectively. Written reviews split almost evenly too, at 54% and 53% positive.

WikEM ships an update every 5 days, Diagnosaurus® DDx every 10 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | WikEM | Diagnosaurus® DDx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4.8K ratings)](https://appshunter.io/ios/app/wikem/id576405449/reviews) | **[4.8 (2.5K ratings)](https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews)** |
| Number of ratings | **4.8K** | 2.5K |
| Positive reviews | **54.1% of reviews** | 53.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 10 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 167 MB | 19 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [OpenEM Foundation](https://appshunter.io/developer/766470023) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## What reviewers say

### WikEM

[App page](https://appshunter.io/ios/app/wikem/id576405449)

This app provides a continuously updated wiki and database of emergency medicine knowledge for physicians. Access key information offline for rapid reference during daily practice. An in-app subscription unlocks advanced AI-powered questions, favorites, and history features.

**Highlights:** Emergency medicine knowledge database, Continuously updated content, Offline access, AI-powered questions (subscription), Favorites and history (subscription)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WikEM AI Search | $1.99 | per month |
| Premium Features | $4.99 | per year |
| Personal Notes | $0.99 | one-time |
| Favorites and Lists | $5.99 | one-time |
| History and Favorites | $9.99 | one-time |
| WikEM Russian Content | $29.99 | one-time |
| WikEM Italian Content | $29.99 | one-time |
| WikEM Polish Content | $29.99 | one-time |
| WikEM Hindi Content | $29.99 | one-time |
| WikEM Turkish Content | $29.99 | one-time |

**What reviewers like**

- 💡 Useful and concise information
- 🚀 Great resource for quick reference
- 👍 Helpful for medical professionals

**What reviewers complain about**

- 🐛 Frequent login and account issues
- 🐛 App crashes and database loading problems
- 🐛 Compatibility issues with newer devices
- 🔋 High battery consumption

**Reported bugs**

- Login screen freezes
- Incompatible with older devices
- Broken hyperlinks and charts
- Search function not working as expected

**Requested features**

- Dark mode support
- Ability to save favorites and customize the app
- Improved search functionality
- Regular content updates


### 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


## Frequently asked questions

### Is WikEM free?

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

### Is Diagnosaurus® DDx free?

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

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

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

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

Neither WikEM nor Diagnosaurus® DDx shows ads.

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

WikEM ships an update every 5 days, and Diagnosaurus® DDx every 10 months. Most recently, WikEM was updated on October 26, 2026 and Diagnosaurus® DDx 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.*