Preop Eval vs Dermoscopy Two Step Algorithm
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Preop Eval
This app provides guidance for evaluating and preparing adult patients for non-cardiac surgery. It includes algorithms and resources on medication management, cardiac event timing, and preoperative testing, serving as both a reference and a teaching tool for medical professionals.
- Cardiac evaluation algorithm
- Medication guidance (starting/stopping)
- Surgery timing after cardiac events
- Preoperative testing recommendations
- Review for students and residents
- Perioperative insulin management
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Preop Eval organizes and presents much of the guidance that one needs in order to evaluate and prepare adult patients for non-cardiac surgery. It is based upon the guidelines on this topic from the American College of Cardiology, the European Society of Anaesthesiology, the American Society of Anesthesiologists, the Institute for Clinical Systems Improvement, the American College of Chest Physicians, and more (full references in the app). The app contains 1 algorithm and 3 resources: the cardiac evaluation algorithm, guidance on starting and stopping key medications in the perioperative period, guidance on timing of surgery after cardiac events, and guidance on preoperative testing. It also contains a review of preoperative evaluation mainly for students and residents. The app addresses such common questions as: - who needs bloodwork before surgery? - who needs an EKG or a CXR? - how do I handle patients on warfarin, clopidogrel, and DOAC's? - which patients need adjustment of perioperative insulin and diabetic meds, and how? - which active cardiac conditions preclude surgery? - how long after MI or stent should a patient wait before surgery? - are there adjustments to make on psych meds, rheumatologic meds, ACE's and ARB's? This app is written and intended for practicing physicians like internists, family physicians, and hospitalists; for resident physician trainees; and for medical students. In addition to being a reference, the algorithm is written to be a teaching tool by not just delivering an answer, but instead walking a physician through the evaluation process so that one learns that process along the way. As an educator and clinician, I am interested in feedback and I would be grateful for guidance on improving the tool.
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.
- Dermoscopic pattern interpretation
- Question-based diagnostic guidance
- Over 80 photos and charts
- 50 interactive diagnostic cases
- Offline functionality
- Melanocytic and non-melanocytic lesion analysis
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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
Screenshots
Verdict
The clearest difference is review sentiment: Dermoscopy Two Step Algorithm at 100% against Preop Eval's 67%. Dermoscopy Two Step Algorithm also leads on ratings volume (10 vs 2) and iOS requirement (10.0 vs 16.6). Preop Eval's advantage is rating (5.0 vs 4.6). On price, update cadence, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Preop Eval holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Dermoscopy Two Step Algorithm has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 67% of Preop Eval's written reviews are positive against 100% of Dermoscopy Two Step Algorithm's, so the app with the better star average is not the one people write more warmly about.
Preop Eval ships an update every 6 months, Dermoscopy Two Step Algorithm every 5 months. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.
| Parameter | Preop Eval | Dermoscopy Two Step Algorithm |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.6 (10 ratings) |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 10 — better |
| Update frequency | Every 6 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 10.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 220 MB |
| Age rating | 17+ | 17+ |
| Developer | United Health Services, Inc. | Usatine & Erickson Media LLC |
Customer experience
Preop Eval
Dermoscopy Two Step Algorithm
In-app purchases
Preop Eval
No in-app purchases
Dermoscopy Two Step Algorithm
No in-app purchases
Questions
Is Preop Eval free?
Is Dermoscopy Two Step Algorithm free?
Which has better reviews, Preop Eval or Dermoscopy Two Step Algorithm?
Do Preop Eval or Dermoscopy Two Step Algorithm have ads?
Which is updated more often, Preop Eval or Dermoscopy Two Step Algorithm?
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