Comparison

Dermoscopy Two Step Algorithm vs PsoriasisCalc

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
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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

PsoriasisCalc

Features
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Psoriasis Calc is a practical and complete tool for any doctor who deals with psoriasis patients (dermatologists, rheumatologists, general practitioners, etc.). Psoriasis Calc: · Facilitates the use of severity scales in psoriasis. · It takes advantage of the simplicity and the speed provided by smartphones to allow the user to introduce the needed data. · Provides information to the physician to determine the existing comorbilities in psoriatic patients. Texts are presented in both, English and Spanish. This application includes the following calculators: * BSA: The percentage of skin surface affected by psoriasis. The calculation is performed for each affected part of the body, by direct estimation or using the rule of the palm (1 patient palm, including palm and fingers represents 1% of his/her body surface). * PASI: This is a classic scale assessment of the severity of psoriasis developed in 1978. Its values range from 0 to 72. The severity calculation is performed separately: the head including neck, trunk, the upper limbs and lower limbs including the buttocks. It includes the automatic calculation of PASI 50, PASI 75 and PASI 90, useful to define the treatment end point and efficacy. * NAPSI: The signs of psoriasis disease in the nail bed and/or nail matrix are easily registered in a four quadrant scheme of each nail. PsoriasisCalc calculates the NAPSI index. * COMORBIDITIES: This functionality is designed to facilitate the detection of the most common comorbidities of patients with psoriasis. It is based on the study performed by the Spanish Group for the Study of Psoriasis which, after conducting an exhaustive synthesis of the literature so far, proposed a practical decisión algorithm. It will be to the discretion of the physician the interpretation of the conclusions provided by PsoriasisCalc, based on each particular patient clinical context. No allusion is made to drug treatments, which are the sole decision of the practitioner in charge.

Screenshots

Dermoscopy Two Step Algorithm4 screens
PsoriasisCalc4 screens

Verdict

The call

The clearest difference is update cadence: Dermoscopy Two Step Algorithm at every 5 months against PsoriasisCalc's every 16 months. Dermoscopy Two Step Algorithm also leads on iOS requirement (10.0 vs 17.6). On price, ads, in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Dermoscopy Two Step Algorithm ships an update every 5 months, PsoriasisCalc every 16 months. The most recent releases landed on October 27, 2026 and October 16, 2026 respectively.

Scorecard2 real differences · 8 level
Dermoscopy Two Step Algorithm versus PsoriasisCalc: the parameters behind the verdict, then further details
ParameterDermoscopy Two Step AlgorithmPsoriasisCalc
PriceFreeFree
Rating4.6 (10 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings10 — better—
Update frequencyEvery 5 months — betterEvery 16 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS10.0 — better17.6
Further details — not scored
Size220 MB10 MB
Age rating17+17+
DeveloperUsatine & Erickson Media LLCAlejandro Escario

In-app purchases

None

Dermoscopy Two Step Algorithm

No in-app purchases

None

PsoriasisCalc

No in-app purchases

Questions

Is Dermoscopy Two Step Algorithm free?
Dermoscopy Two Step Algorithm is free to download, with no in-app purchases.
Is PsoriasisCalc free?
PsoriasisCalc is free to download, with no in-app purchases.
Do Dermoscopy Two Step Algorithm or PsoriasisCalc have ads?
Neither Dermoscopy Two Step Algorithm nor PsoriasisCalc shows ads.
Which is updated more often, Dermoscopy Two Step Algorithm or PsoriasisCalc?
Dermoscopy Two Step Algorithm ships an update every 5 months, and PsoriasisCalc every 16 months. Most recently, Dermoscopy Two Step Algorithm was updated on October 27, 2026 and PsoriasisCalc on October 16, 2026.

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