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Diagnosaurus® DDx

Diagnosaurus® DDx

Best-selling DDx app worldwide

2.5K ratings
77 reviews
💪 Health & Fitness
🏥 Medical
Free
In-App Purchases

Details

Released
March 19, 2014
Updated
October 17, 2026

Features

Developer

Unbound Medicine, Inc.
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Diagnosaurus® DDx screenshot #1 for iPhone
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Diagnosaurus® DDx screenshot #6 for iPhone
iphone
ipad
🧾$4.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐77
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🔄6+ apps
Alternatives↘︎
❓5 answered
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📦~ in 9 months
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About

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
Show original description

What users say about Diagnosaurus® DDx

Reviews of Diagnosaurus® DDx are mixed: the Medical app is rated 4.8/5 from 2.5K App Store ratings. What users like most: user-friendly interface, quick access to differential diagnoses. Top complaints: lack of in-depth information, incomplete differential diagnoses. Summarized from real user reviews.

Positive things

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

Negative things

  • 🐛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
See all reviews

What's New in Diagnosaurus® DDx

1.15

October 17, 2026

This update adds support for iPhone Duo and ensures full compatibility with the latest iOS 27 release, delivering a more reliable experience with improved performance and stability. We're always here to help—if you have any questions or feedback, please contact Unbound Medicine Support at support@unboundmedicine.com

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Subscriptions & In-App Purchases

$4.99

Diagnosaurus DDx

This quick-reference tool helps healthcare professionals perform differential diagnosis with speed and confidence at the point of care.

User reviews

Most RecentHighest RatedLowest Rated

.

Very useful. Clean clear interface (no barrage of popup ads).
Nniccast0

Good

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

The Best App

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

Very nice

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

Response from developer

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.

Marginal

Pregnancy is listed as a disease. It is not! Poor app!
NNoNoviceDoc
See 72 more reviews

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User experience

🐞

Reported Bugs

3 issues

Subscription issues and inability to restore purchases

Bug

Blank pages and non-functional content

Bug

Compatibility issues with newer iOS versions

Bug
✨

Requested Features

5 requests

Add ability to edit or add custom differential diagnoses

Feature

Improve search functionality and navigation

Feature

Provide more detailed information on conditions

Feature

Integrate with other medical resources and databases

Feature

Improve support for older devices and iOS versions

Feature

FAQ

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.