# Diagnosaurus® DDx — Best-selling DDx app worldwide

> Differential diagnosis tool for healthcare professionals with over 1,000 diagnoses. (iPhone/iPad app by Unbound Medicine, Inc..)

- Source: https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910 (this page in markdown: same URL + `.md`)
- Developer: [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400)
- Category: Medical, Health & Fitness
- Price: Free with in-app purchases
- Rating: 4.80/5 from 2,481 App Store ratings · 77 written reviews indexed
- Age rating: 17+
- Requires: iOS 15.0 · 18 MB
- Languages: American English
- Released: 2014-03-19
- Data updated: 2026-08-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews.md

## What is Diagnosaurus® DDx?

** 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

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## What do users think of Diagnosaurus® DDx?

Overall sentiment: neutral

**Pros**

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

**Cons**

- 🐛 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

**Commonly reported bugs**

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

**Most 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

## Recent user reviews (10 of 77)

All indexed reviews: https://appshunter.io/ios/app/diagnosaurus-ddx/id833728910/reviews.md

### 5/5 — .

*2026-08-06, version 1.13*

Very useful. Clean clear interface (no barrage of popup ads).

### 5/5 — Good

*2026-07-08, version 1.13*

I use it a lot for practicals. They want a differential diagnosis, I can think of many from this app only.

### 5/5 — The Best App

*2026-06-10, version 1.13*

I have used the app since 2000 and find it extremely useful.

### 5/5 — Very nice

*2025-12-11*

I've used this for years since I was a medical student, very helpful for clinical thinking and diagnosis!

**Developer response:** Thank you for taking the time to share your thoughts about our Diagnosaurus app! We love to hear how our apps are part of your experience throughout your career. Thank you again for reaching out.

### 1/5 — Marginal

*2025-11-23, version 1.11*

Pregnancy is listed as a disease. It is not! Poor app!

### 5/5 — Very helpful

*2025-08-24, version 1.11*

For years, I have used Diagnosaurus as an aid in practice and in teaching my medical students.

### 1/5 — Marginal

*2025-06-06, version 1.11*

Lacks in-depth info

### 2/5 — Do Not Purchase

*2024-08-22, version 1.11*

(Review from NP student) This DDx is greatly lacking in substance and content. Many signs and symptoms are not listed and many differentials are left out.

### 5/5 — Excellent clinical tools

*2023-08-29, version 1.10*

J’ai utilisé cette application en tant que résident . Il est toujours pertinent tandis que je pratique maintenant.
Utile pour conduire un bon questionnaire surtout pour les symptômes peu courants et poir ne pas rater l’essentiel

### 4/5 — first line DDx

*2023-02-25*

Useful as a first line differential Dx. after history taking and physical ex.

## Frequently asked questions about Diagnosaurus® DDx

### What is Diagnosaurus DDx?

Diagnosaurus DDx is a quick-reference tool designed for healthcare professionals to assist with differential diagnosis. It provides access to over 1,000 diagnoses, organized by organ system, symptom, or disease, enabling users to quickly explore potential conditions.

### What are the key features of Diagnosaurus DDx?

Key features include a database of over 1,000 differential diagnoses, the ability to search by organ system, symptom, or disease, and a 'See Related DDx' function to explore alternative diagnoses. Users can also highlight entries, make custom notes, and save important entries to a 'Favorites' list.

### How much does Diagnosaurus DDx cost?

The application is free to download and use, but it does offer in-app purchases and may display advertisements. Specific features or content might be unlocked through these purchases.

### Who is the target audience for Diagnosaurus DDx?

This app is intended for healthcare professionals, such as physicians, who need a fast and reliable tool for differential diagnosis at the point of care. It helps them consider a wide range of potential diagnoses efficiently.

### How does the 'See Related DDx' feature work?

The 'See Related DDx' feature within each diagnosis entry allows users to quickly view and link to other potential diagnoses that are related. This helps in considering alternative possibilities and broadening the differential diagnosis process.

## Version history (last 5 releases)

### 1.13 — 2026-02-20

We’ve upgraded our purchase process. We implemented Apple’s latest payment technology to make buying and restoring purchases smoother than ever.
   - Instant Access: Your premium features unlock immediately after purchase.
   - Better Reliability: No more "Restore Purchase" errors.
   - Seamless Management: Easier control over your subscription status directly within the app

If you have any questions or feedback, please contact Unbound Medicine Support.

### 1.12 — 2025-12-12

* Interface optimized for latest operating system, iOS26 - including liquid glass display. 

If you have any questions or feedback, please contact Unbound Medicine Support.

### 1.11 — 2024-08-05

* New Notes design with more highlighting colors.
* Improved performance for faster access to critical medical information. 
* New in-app interface improvements aid in content navigation

If you have any questions or feedback, please reach out to the Unbound Medicine support team.

### 1.10 — 2020-07-09

* Bug Fixes
* New app icon

If you have questions about the latest update, please contact Unbound Medicine Support.

### 1.9 — 2019-09-11

The app was updated to ensure optimum performance with the latest operating systems.

If you have questions about the latest update, please contact Unbound Medicine Support.

## Apps similar to Diagnosaurus® DDx

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Family Practice Guidelines FNP](https://appshunter.io/ios/app/family-practice-guidelines-fnp/id1238332258) | 4.7 (589) | Free | Medical |
| [Coverage Search](https://appshunter.io/ios/app/coverage-search/id834992816) | 4.3 (574) | Free | Medical |
| [Medscape](https://appshunter.io/ios/app/medscape/id321367289) | 3.6 (1,396) | Free | Medical |
| [Skyscape Medical Library](https://appshunter.io/ios/app/skyscape-medical-library/id818609413) | 4.8 (2,980) | Free | Medical |
| [Calculate by QxMD](https://appshunter.io/ios/app/calculate-by-qxmd/id361811483) | 4.8 (5,100) | Free | Medical |
| [Read by QxMD](https://appshunter.io/ios/app/read-by-qxmd/id574041839) | 4.8 (6,042) | Free | Medical |

## More apps by Unbound Medicine, Inc.

- [Nursing Central](https://appshunter.io/ios/app/nursing-central/id300420397)
- [Davis's Drug Guide - Nurses](https://appshunter.io/ios/app/daviss-drug-guide-nurses/id301427093)
- [5 Minute Clinical Consult](https://appshunter.io/ios/app/5-minute-clinical-consult/id301865751)
- [Taber's Medical Dictionary](https://appshunter.io/ios/app/tabers-medical-dictionary/id301866347)
- [uCentral™ for Institutions](https://appshunter.io/ios/app/ucentral-for-institutions/id301867156)
- [Harrison's Manual of Medicine](https://appshunter.io/ios/app/harrisons-manual-of-medicine/id312094746)

All apps by Unbound Medicine, Inc.: https://appshunter.io/developer/300420400

## Related topics

[diagnosaurus](https://appshunter.io/ios/topics/diagnosaurus) · [differential diagnosis](https://appshunter.io/ios/topics/differential-diagnosis) · [differential diagnosis guide](https://appshunter.io/ios/topics/differential-diagnosis-guide) · [ddx in small animal medicine](https://appshunter.io/ios/topics/ddx-in-small-animal-medicine) · [medical diagnosis reference](https://appshunter.io/ios/topics/medical-diagnosis-reference) · [washington manual cardiology](https://appshunter.io/ios/topics/washington-manual-cardiology) · [medical diagnosis](https://appshunter.io/ios/topics/medical-diagnosis) · [mdgroup](https://appshunter.io/ios/topics/mdgroup)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*