Eponyms vs Diagnosaurus® DDx
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Eponyms
This app provides a quick reference for approximately 1800 medical eponyms, including common and obscure terms. It features full-text search, categorized browsing, and a learn mode for studying. Star your favorite eponyms for easy recall and practice.
- 1800+ medical eponyms
- Full text search
- Browse by 26 categories
- Star favorite eponyms
- Recently accessed list
- Quick learn mode
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Eponyms brings a short description of about 1800 common and obscure medical eponyms (e.g., Rovsing's sign, Virchow's node) to your iPhone, iPad or iPod touch. A perfect tool to quickly look up the meaning of any eponym. It uses the beautiful eponym database from Andrew J. Yee (http://www.eponyms.net/). ## Features • About 1800 eponyms • Full text search • Browse by any of the 26 categories • Star eponyms to keep track of the eponyms you tend to forget or with which you want to test your students on • List of recently accessed eponyms • Quick and easy learn mode ## Learn Mode The learn mode allows you to: • swipe to the left to show a random eponym but not its title • swipe to the right to show a random eponym title but not its text • pull down to reveal the hidden info Learn mode displays eponyms from the category you're currently visiting. This means you can either learn eponyms from a given category, only the ones that you've starred or simply all of them. ## Students Look out for the free student version of Eponyms: it's identical to to this version but free for educational purposes!
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
Screenshots
Verdict
The clearest difference is price: Diagnosaurus® DDx at Free against Eponyms's $1.99. Diagnosaurus® DDx also leads on rating (4.8 vs 2.5) and ratings volume (2.5K vs 2). Eponyms's advantage is in-app purchases (none vs 1) and review sentiment (73% vs 53%). On update cadence, ads and device support 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
Diagnosaurus® DDx is free to download; Eponyms costs $1.99 up front. Diagnosaurus® DDx sells 1 one-off in-app purchase. Eponyms asks for nothing beyond the download.
Diagnosaurus® DDx holds the better App Store score, 4.8 against 2.5. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 73% of Eponyms's written reviews are positive against 53% of Diagnosaurus® DDx's, so the app with the better star average is not the one people write more warmly about.
Eponyms ships an update every 7 months, Diagnosaurus® DDx every 10 months. Both last shipped on October 24, 2026.
| Parameter | Eponyms | Diagnosaurus® DDx |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 2.5 (2 ratings) | 4.8 (2.5K ratings) — better |
| Positive reviews | 72.7% of reviews — better | 53.2% of reviews |
| Number of ratings | 2 | 2.5K — better |
| Update frequency | Every 7 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 10.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 18 MB | 19 MB |
| Age rating | 12+ | 17+ |
| Developer | Ossus GmbH | Unbound Medicine, Inc. |
Customer experience
Eponyms
Diagnosaurus® DDx
Bugs and requests
Eponyms
Not enough reviews yet to summarise bugs or 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
In-app purchases
Eponyms
No in-app purchases
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
Questions
Is Eponyms free?
Is Diagnosaurus® DDx free?
Which has better reviews, Eponyms or Diagnosaurus® DDx?
Do Eponyms or Diagnosaurus® DDx have ads?
Which is updated more often, Eponyms or Diagnosaurus® DDx?
Other comparisons
