Diagnosaurus® DDx vs Medchatter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
Medchatter
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Medchatter is a modern social/professional platform designed exclusively for the healthcare community. Whether you’re a physician, nurse, pharmacist, medical student, technician, or part of the support staff that keeps care running, this is your space to talk, share, and connect.
Screenshots
Verdict
The clearest difference is in-app purchases: Medchatter at none against Diagnosaurus® DDx's 1. Medchatter also leads on update cadence (every 2 months vs every 10 months). Diagnosaurus® DDx's advantage is ads (none vs shown) and device support (4 vs 2). On price and iOS requirement 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. Diagnosaurus® DDx sells 1 one-off in-app purchase. Medchatter asks for nothing beyond the download.
Diagnosaurus® DDx ships an update every 10 months, Medchatter every 2 months. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.
| Parameter | Diagnosaurus® DDx | Medchatter |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (2.5K ratings) — better | — |
| Positive reviews | 53.2% of reviews | — |
| Number of ratings | 2.5K — better | — |
| Update frequency | Every 10 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 19 MB | 85 MB |
| Age rating | 17+ | 17+ |
| Developer | Unbound Medicine, Inc. | Medchatter, Inc |
Bugs and requests
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
Medchatter
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
Medchatter
No in-app purchases
Questions
Is Diagnosaurus® DDx free?
Is Medchatter free?
Do Diagnosaurus® DDx or Medchatter have ads?
Which is updated more often, Diagnosaurus® DDx or Medchatter?
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