Dermatomes vs Diagnosaurus® DDx
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dermatomes
This app offers a detailed, zoomable map of spinal nerve roots and their corresponding skin sensation areas. It includes charts of important landmarks and is designed for medical professionals and students as a quick reference for neuroanatomy.
- Zoomable dermatome map
- Anterior and posterior views
- Cutaneous nerve distribution
- Reference chart of landmarks
- Pinch-to-zoom functionality
Read full descriptionHide full description
Dermatomes is a handy reference map of which spinal nerve roots relay sensation from particular areas of the skin along with a cutaneous nerve distribution. Dermatomes provides a zoomable map of anterior and posterior dermatomes and cutaneous nerve distributions with a reference chart of important landmarks . Pinch to zoom in and out on the map. Dermatomes is an essential reference for neurologists, emergency physicians, family doctors, medical students, physiotherapists, chiropractors, osteopaths and other medical professionals – or anyone curious about neuroanatomy and the workings of the human body. Featured in Apple's 2010 essential apps for medical students. Consult a doctor if you are experiencing neurological symptoms. This app should not be relied upon to make clinical decisions, which remain the full responsibility of the user. Dermatomes are variable between individuals and the pattern of sensory loss is usually less than the entire dermatome, because of overlap. The map and landmarks presented are a consensus view drawn from numerous sources. Dermatomes comes with lifetime email support.
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
Screenshots
Verdict
The clearest difference is price: Diagnosaurus® DDx at Free against Dermatomes's $0.99. Diagnosaurus® DDx also leads on rating (4.8 vs 3.0) and ratings volume (2.5K vs 4). Dermatomes's advantage is in-app purchases (none vs 1) and update cadence (every 6 weeks vs every 10 months). On 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; Dermatomes costs $0.99 up front. Diagnosaurus® DDx sells 1 one-off in-app purchase. Dermatomes asks for nothing beyond the download.
Diagnosaurus® DDx holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Diagnosaurus® DDx has 2.5K ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 64% of Dermatomes'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.
Dermatomes ships an update every 6 weeks, Diagnosaurus® DDx every 10 months. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.
| Parameter | Dermatomes | Diagnosaurus® DDx |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.0 (4 ratings) | 4.8 (2.5K ratings) — better |
| Positive reviews | 63.9% of reviews — better | 53.2% of reviews |
| Number of ratings | 4 | 2.5K — better |
| Update frequency | Every 6 weeks — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Best chart rank | #106 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 17 MB | 19 MB |
| Age rating | 12+ | 17+ |
| Developer | Codev Ltd | Unbound Medicine, Inc. |
Customer experience
Dermatomes
Diagnosaurus® DDx
Bugs and requests
Dermatomes
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
Dermatomes
No in-app purchases
Diagnosaurus® DDx
- Diagnosaurus DDx$4.99
Questions
Is Dermatomes free?
Is Diagnosaurus® DDx free?
Which has better reviews, Dermatomes or Diagnosaurus® DDx?
Do Dermatomes or Diagnosaurus® DDx have ads?
Which is updated more often, Dermatomes or Diagnosaurus® DDx?
Other comparisons















