WikEM vs Diagnosaurus® DDx
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WikEM
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.
- Emergency medicine knowledge database
- Continuously updated content
- Offline access
- AI-powered questions (subscription)
- Favorites and history (subscription)
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WikEM is an online wiki and database of emergency medicine knowledge to assist physicians with their daily practice. The content is continuously updated from WikEM.org allowing for rapid reference of key information. The content is available offline with this mobile application. WikEM is intended for clinicians only and not directly for patients. In app subscription purchases: *The in-app purchase unlocks unlimited natural language questions using our AI and also favorites and history features • Payment will be charged to iTunes Account at confirmation of purchase • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable WikEM terms of use: wikem.org/wiki/WikEM:Terms_of_Use
Diagnosaurus® DDx
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.
- 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
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** Top-Selling App Used by Tens of Thousands of Health Professionals, Worldwide ** ABOUT DIAGNOSAURUS DDX This quick-reference tool helps healthcare professionals perform differential diagnosis with speed and confidence at the point of care. With Diagnosaurus you can quickly search over 1,000 diagnoses by organ system, symptom, or disease, or you can view all entries. Use the valuable “See Related DDx” feature within each entry to consider alternative diagnoses and quickly link to those entries. The convenient “Favorites” feature allows you to save specific searches and bookmark in your personal archive. FEATURES • More than 1,000 differential diagnoses • Highlight and make custom notes within entries • Entries organized in quick-read format • “See Related DDx” links to other potential diagnoses • Disease, symptom, and organ system indexes • “Favorites” for bookmarking important entries • Universal Index Search to help find answers fast Author: Roni F. Zeiger, MD Publisher: McGraw-Hill Medical Powered by: Unbound Medicine
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 — 4.7K 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. The most recent releases landed on September 26, 2026 and September 27, 2026 respectively.
| Parameter | WikEM | Diagnosaurus® DDx |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4.7K ratings) | 4.8 (2.5K ratings) |
| Positive reviews | 54.1% of reviews — better | 53.2% of reviews |
| Number of ratings | 4.7K — better | 2.5K |
| Update frequency | Every 5 days — better | Every 10 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 157 MB | 18 MB |
| Age rating | 17+ | 17+ |
| Developer | OpenEM Foundation | Unbound Medicine, Inc. |
Customer experience
WikEM
Diagnosaurus® DDx
User reviews
WikEM
From 4.7K App Store ratingsWhat we love
- 💡 Useful and concise information
- 🚀 Great resource for quick reference
- 👍 Helpful for medical professionals
Room to improve
- 🐛 Frequent login and account issues
- 🐛 App crashes and database loading problems
- 🐛 Compatibility issues with newer devices
- 🔋 High battery consumption
Diagnosaurus® DDx
From 2.5K App Store ratingsWhat we love
- 👍 User-friendly interface
- 🚀 Quick access to differential diagnoses
- 💡 Helpful for building differential diagnoses
- 👍 Comprehensive coverage of conditions
- 👍 Useful for medical students and practitioners
Room to improve
- 🐛 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
Bugs and requests
WikEM
Reported bugs
4 issues- Login screen freezes
- Incompatible with older devices
- Broken hyperlinks and charts
- Search function not working as expected
Requested features
4 requests- Dark mode support
- Ability to save favorites and customize the app
- Improved search functionality
- Regular content updates
Diagnosaurus® DDx
Reported bugs
3 issues- Subscription issues and inability to restore purchases
- Blank pages and non-functional content
- Compatibility issues with newer iOS versions
Requested features
5 requests- 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
In-app purchases
WikEM
- WikEM AI Search$1.991 Month
- Premium Features$4.991 Year
- Personal Notes$0.99
- Favorites and Lists$5.99
- History and Favorites$9.99
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- WikEM Russian Content$29.99
- WikEM Italian Content$29.99
- WikEM Polish Content$29.99
- WikEM Hindi Content$29.99
- WikEM Turkish Content$29.99
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
