Comparison

Dermatomes vs Diagnosaurus® DDx

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Zoomable dermatome map
  • Anterior and posterior views
  • Cutaneous nerve distribution
  • Reference chart of landmarks
  • Pinch-to-zoom functionality
Features
Currently charting
Read 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.

About

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.

Highlights
  • 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
Features
Read 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

Dermatomes3 screens
Diagnosaurus® DDx4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard9 real differences · 2 level
Dermatomes versus Diagnosaurus® DDx: the parameters behind the verdict, then further details
ParameterDermatomesDiagnosaurus® DDx
Price$0.99Free — better
Rating3.0 (4 ratings)4.8 (2.5K ratings) — better
Positive reviews63.9% of reviews — better53.2% of reviews
Number of ratings42.5K — better
Update frequencyEvery 6 weeks — betterEvery 10 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#106 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS11.0 — better15.0
Further details — not scored
Size17 MB19 MB
Age rating12+17+
DeveloperCodev LtdUnbound Medicine, Inc.

Customer experience

Dermatomes

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews36 reviews
Positive63.9%
Neutral0.0%
Negative36.1%

Diagnosaurus® DDx

All ratings2,500 ratings
Positive96.2%
Neutral1.6%
Negative2.2%
Written reviews77 reviews
Positive53.2%
Neutral2.6%
Negative44.2%

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

None

Dermatomes

No in-app purchases

1 purchases

Diagnosaurus® DDx

One-time1
  • Diagnosaurus DDx$4.99

Questions

Is Dermatomes free?
Dermatomes costs $0.99, with no in-app purchases.
Is Diagnosaurus® DDx free?
Diagnosaurus® DDx is free to download, with in-app purchases available.
Which has better reviews, Dermatomes or Diagnosaurus® DDx?
Diagnosaurus® DDx is rated higher. Dermatomes averages 3.0 out of 5 from 4 ratings, while Diagnosaurus® DDx averages 4.8 from 2.5K ratings.
Do Dermatomes or Diagnosaurus® DDx have ads?
Neither Dermatomes nor Diagnosaurus® DDx shows ads.
Which is updated more often, Dermatomes or Diagnosaurus® DDx?
Dermatomes ships an update every 6 weeks, and Diagnosaurus® DDx every 10 months. Most recently, Dermatomes was updated on October 19, 2026 and Diagnosaurus® DDx on October 20, 2026.

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