Comparison

Dermoscopy Two Step Algorithm vs Derm DDx

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

Head to head
About

Dermoscopy Two Step Algorithm

This app guides healthcare professionals in interpreting dermoscopic patterns to identify skin lesions. It uses a series of questions and provides over 80 images and charts to aid in diagnosis. Interactive cases are included for practice.

Highlights
  • Dermoscopic pattern interpretation
  • Question-based diagnostic guidance
  • Over 80 photos and charts
  • 50 interactive diagnostic cases
  • Offline functionality
  • Melanocytic and non-melanocytic lesion analysis
Features
Read full description

This app is intended to help you interpret the dermoscopic patterns seen with your dermatoscope. You will be asked a series of questions that will lead you to the most probable diagnosis. This app also contains over 80 photos and charts to help you in your diagnosis. No internet connection needed to view the full app. It is all ready for super quick image and information retrieval. There are also 50 interactive cases to solve. Each case starts with a clinical and dermoscopic image and ends with a labelled dermoscopic image pointing out critical structures. This app is based on the 2 step algorithm with the first step involving the determination of whether the lesion is a melanocytic. Melanocytic lesions will be divided into nevi or lesions with varying levels of suspicion for melanoma based on melanoma specific patterns and common nevi patterns. Non-melanocytic lesions will be analyzed to determine if they are suspicious for basal cell carcinoma or squamous cell carcinoma. Common benign lesions such as dermatofibroma, seborrheic keratoses and hemangiomas will be positively identified to avoid unnecessary biopsies. This app will increase your ability to detect skin cancers with greater accuracy thereby decreasing unnecessary biopsies and missing less early melanomas and nonmelanoma skin cancers. Check out https://usatinemedia.com to learn more and watch a video demo of this app narrated by Dr. Richard P. Usatine. Authors: Ashfaq A. Marghoob, MD Memorial Sloan-Kettering Cancer Center New York, New York Richard P. Usatine, MD University of Texas Health Science Center San Antonio, Texas Natalia Jaimes, MD Aurora Skin Cancer Center and Universidad Pontificia Bolivariana Medellin, Colombia To learn more dermoscopy from these authors, see www.americandermoscopy.com. Disclaimer: This app is intended for the education of healthcare professionals and not as a diagnostic and treatment reference for the general population. Disclaimer: While this app may help you in rendering a correct diagnosis, it is not intended to entirely replace the findings on patient history and physical examination including examination of the lesion with side lighting and touch. The final diagnosis rests on properly assimilating the information gained from the patient history, thorough naked eye physical examination, and meticulous dermoscopic inspection of the lesion. 3Gen, Inc. is the sponsor of this app. Visit www.dermlite.com to see their complete line of skin imaging devices. Developed by Usatine Media Richard P. Usatine, MD, Co-President, Professor of Family & Community Medicine, Professor of Dermatology and Cutaneous Surgery, University of Texas Health San Antonio Peter Erickson, Co-President, Lead Software Developer

About

Derm DDx

This app provides visual, point-of-care guidance for diagnosing skin disorders. It features a large database of high-resolution images, allowing users to compare variations, zoom in, and access clinical history and treatment options for over 160 dermatologic conditions.

Highlights
  • 650+ high-quality dermatology images
  • Guidance for 160+ dermatologic conditions
  • Side-by-side image variations
  • Zoomable high-resolution images
  • Clinical history and treatment options
  • Cross-referencing to differential diagnoses
  • Full text search and custom notes
Features
Read full description

The Dermatology DDx app from Unbound Medicine delivers visual, point-of-care guidance for establishing the diagnosis of skin disorders. This powerful, photo-intensive database allows users to search, view side-by-side variations of each skin disorder, easily zoom in on any of the high-resolution images, and instantly link to similar conditions to ensure accurate diagnosis. Each entry also contains clinical history, physical findings, and treatment options. Features of Dermatology DDx include: • 650+ high-quality images presented with common variations in presentation • Point-of-care guidance for 160+ dermatologic conditions • Cross reference links to differential diagnoses • History and treatment within each entry • Appendix charting potencies of topical steroids • Highlight and make custom notes within entries • Full Text Search to find topics quickly • Favorites for ’bookmarking’ important entries Authors: by James G. Dinulos MD, M. Shane Chapman MD, Andrew Eugene Werchniak MD, Dorothea T. Barton MD, Thomas P. Habif MD Publisher: Elsevier Powered by: Unbound Medicine Unbound Privacy Policy: www.unboundmedicine.com/privacy Unbound Terms of Use: https://www.unboundmedicine.com/end_user_license_agreement

Screenshots

Dermoscopy Two Step Algorithm4 screens
Derm DDx4 screens

Verdict

The call

The clearest difference is in-app purchases: Dermoscopy Two Step Algorithm at none against Derm DDx's 1. Dermoscopy Two Step Algorithm also leads on rating (4.6 vs 4.3) and iOS requirement (10.0 vs 15.0). On price, ratings volume, update cadence and ads 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

Both are free to download. Derm DDx sells 1 one-off in-app purchase. Dermoscopy Two Step Algorithm asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Dermoscopy Two Step Algorithm holds the better App Store score, 4.6 against 4.3. Both are backed by a comparable volume of ratings — 10 and 6 respectively.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

Scorecard4 real differences · 6 level
Dermoscopy Two Step Algorithm versus Derm DDx: the parameters behind the verdict, then further details
ParameterDermoscopy Two Step AlgorithmDerm DDx
PriceFreeFree
Rating4.6 (10 ratings) — better4.3 (6 ratings)
Positive reviews100.0% of reviews—
Number of ratings10 — better6
Update frequencyEvery 5 monthsEvery 5 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better15.0
Further details — not scored
Size220 MB10 MB
Age rating17+17+
DeveloperUsatine & Erickson Media LLCUnbound Medicine, Inc.

Customer experience

Dermoscopy Two Step Algorithm

All ratings10 ratings
Positive90.0%
Neutral0.0%
Negative10.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Derm DDx

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%

In-app purchases

None

Dermoscopy Two Step Algorithm

No in-app purchases

1 purchases

Derm DDx

One-time1
  • Dermatology DDx$69.99

Questions

Is Dermoscopy Two Step Algorithm free?
Dermoscopy Two Step Algorithm is free to download, with no in-app purchases.
Is Derm DDx free?
Derm DDx is free to download, with in-app purchases available.
Which has better reviews, Dermoscopy Two Step Algorithm or Derm DDx?
Dermoscopy Two Step Algorithm is rated higher. Dermoscopy Two Step Algorithm averages 4.6 out of 5 from 10 ratings, while Derm DDx averages 4.3 from 6 ratings.
Do Dermoscopy Two Step Algorithm or Derm DDx have ads?
Neither Dermoscopy Two Step Algorithm nor Derm DDx shows ads.
Which is updated more often, Dermoscopy Two Step Algorithm or Derm DDx?
Dermoscopy Two Step Algorithm ships an update every 5 months, and Derm DDx every 5 months. Most recently, Dermoscopy Two Step Algorithm was updated on October 7, 2026 and Derm DDx on October 11, 2026.

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