Diagnosaurus® DDx vs FP Notebook
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
Read full descriptionHide full description
** 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
FP Notebook
A comprehensive medical reference for primary care and emergency clinicians, offering rapid access to over 6100 interlinked topic pages. Content is updated monthly through literature reviews and conferences, providing up-to-date information for medical professionals.
- Rapid access medical reference
- Over 6100 interlinked topic pages
- Content updated monthly
- 31 specialty books
- 700+ chapters
- Point-of-care tool
Read full descriptionHide full description
Family Practice Notebook is a rapid access, point-of-care medical reference for primary care and emergency clinicians. Started in 1995, this collection now contains over 6100 interlinked topic pages divided into a tree of 31 specialty books and over 700 chapters. FP Notebook’s content is updated monthly with systematic literature reviews and conferences. Please purchase an auto-renewing subscription to receive the latest content. The text content for this mobile application is identical to its online counterparts: fpnotebook.com and fpnotebook.com/mobile. Although access to this application is not restricted, the information found here is intended for use by medical providers. Non-clinical users may find the material challenging to understand, and should address specific medical concerns with their medical providers. Try before you buy with a 14-day FREE trial. After that it's only $24.99/year for access, including continuous content updates. Privacy Policy/Terms & Conditions - http://www.fpnotebook.com/disclaimer.htm
Screenshots
Verdict
The clearest difference is monetization model: Diagnosaurus® DDx at free with in-app purchases against FP Notebook's subscription. FP Notebook's advantage is update cadence (every 2 months vs every 10 months) and chart position (#51 vs unranked). 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. Diagnosaurus® DDx sells 1 one-off in-app purchase and FP Notebook sells 3 in-app purchases, starting at $1.99 per month. 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 Diagnosaurus® DDx against 4.8 for FP Notebook. Both are backed by a comparable volume of ratings — 2.5K and 3.3K respectively. Written reviews are what separate them: 53% of Diagnosaurus® DDx's written reviews are positive against 58% of FP Notebook's.
Diagnosaurus® DDx ships an update every 10 months, FP Notebook every 2 months. The most recent releases landed on September 24, 2026 and September 23, 2026 respectively.
| Parameter | Diagnosaurus® DDx | FP Notebook |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (2.5K ratings) | 4.8 (3.3K ratings) |
| Positive reviews | 53.2% of reviews | 58.2% of reviews — better |
| Number of ratings | 2.5K | 3.3K — better |
| Update frequency | Every 10 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Best chart rank | — | #51 — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 14.3 — better |
| Further details — not scored | ||
| Size | 18 MB | 134 MB |
| Age rating | 17+ | 17+ |
| Developer | Unbound Medicine, Inc. | Atmosphere Apps, Inc. |
Customer experience
Diagnosaurus® DDx
FP Notebook
User reviews
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
FP Notebook
From 3.3K App Store ratingsWhat we love
- 🌟 Excellent, comprehensive medical reference
- ⚡️ Efficient, concise, and easy to use
- 🧠 Invaluable for medical students, residents, and practitioners
- 🤝 Highly recommended by users
- 🕰️ Frequently used and relied upon for years
Room to improve
- 💰 Subscription model frustrates some users who previously had free access
- 🐞 Occasional app freezing or crashing issues reported
- 🔍 Built-in search function could be improved
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
FP Notebook
Reported bugs
2 issues- App freezing or crashing on certain devices
- Subscription issues or unexpected charges
Requested features
2 requests- Ability to earn continuing education credits through the app
- Improved search functionality
In-app purchases
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
FP Notebook
- Monthly Subscription$1.991 Month
- Annual Subscription$19.991 Year
- Annual Sub14 Days trial$24.991 Year
Questions
Is Diagnosaurus® DDx free?
Is FP Notebook free?
Which has better reviews, Diagnosaurus® DDx or FP Notebook?
Do Diagnosaurus® DDx or FP Notebook have ads?
Which is updated more often, Diagnosaurus® DDx or FP Notebook?
Other comparisons
