** Top-Selling App Used by Tens of Thousands of Health Professionals, Worldwide **

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.

• 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

What's New

Version 1.8

This latest update provides interface upgrades to help enhance the performance of your app.
If you have further questions about the new features, please contact Unbound Medicine Support.
Thank you for using Diagnosaurus DDX.

Ratings and Reviews

4.5 out of 5
178 Ratings
178 Ratings

Unbound do not use

I have had many of their products in last few years at about 60 an app. iOS 11 comes along and they are the ONLY app publisher that didn’t update their product to work in iOS 11. Their solution - rebuy every app to the updated iOS app. I bought the standalone non subscription app to prevent downstream costs with a huge upfront cost. Egg on my face huh.

Unbound had 2 years to update all their apps but chose to gouge their customer base!

SHS chufgjbchj

They make you rebuy it!!

I bought this app years ago which I loved and then they just stopped supporting the old version and it no longer works and they don’t grandfather you into the new one.

I’m thinking of buying the new one but don’t want to support a company that’s just gonna make me buy a new and functionally identical product every few years after they make your old one obsolete.

Developer Response

Hi there, the release of iOS 11 removed support for a lot of our older applications. If your Diagnosaurus was an older version that lost support, we encourage you to reach out to our Support team so that we can find a solution for you.


Use at work

Yes, I actually use this at work. Helps me not overlook rare or dangerous symptoms. Could be a bit more streamlined for this purpose, but otherwise it's functional, comprehensive, and inexpensive.


Unbound Medicine, Inc.
17.2 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
You must be at least 17 years old to download this app.
Frequent/Intense Medical/Treatment Information
© 2019 Unbound Medicine, Inc.
In-App Purchases
  1. Diagnosaurus DDx $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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