# Preop Eval vs Dermoscopy Two Step Algorithm

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.

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.

## The numbers

| Metric | Preop Eval | Dermoscopy Two Step Algorithm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/preop-eval/id374154834/reviews)** | [4.6 (10 ratings)](https://appshunter.io/ios/app/dermoscopy-two-step-algorithm/id731753300/reviews) |
| Number of ratings | 2 | **10** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 15 MB | 220 MB |
| Requires iOS | 16.6 | **10.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [United Health Services, Inc.](https://appshunter.io/developer/1451318916) | [Usatine & Erickson Media LLC](https://appshunter.io/developer/1466894388) |

## What reviewers say

### Preop Eval

[App page](https://appshunter.io/ios/app/preop-eval/id374154834)

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.

**Highlights:** Cardiac evaluation algorithm, Medication guidance (starting/stopping), Surgery timing after cardiac events, Preoperative testing recommendations, Review for students and residents, Perioperative insulin management

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Dermoscopy Two Step Algorithm

[App page](https://appshunter.io/ios/app/dermoscopy-two-step-algorithm/id731753300)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Preop Eval free?

Preop Eval is free to download, with no in-app purchases.

### Is Dermoscopy Two Step Algorithm free?

Dermoscopy Two Step Algorithm is free to download, with no in-app purchases.

### Which has better reviews, Preop Eval or Dermoscopy Two Step Algorithm?

Preop Eval is rated higher. Preop Eval averages 5.0 out of 5 from 2 ratings, while Dermoscopy Two Step Algorithm averages 4.6 from 10 ratings.

### Do Preop Eval or Dermoscopy Two Step Algorithm have ads?

Neither Preop Eval nor Dermoscopy Two Step Algorithm shows ads.

### Which is updated more often, Preop Eval or Dermoscopy Two Step Algorithm?

Preop Eval ships an update every 6 months, and Dermoscopy Two Step Algorithm every 5 months. Most recently, Preop Eval was updated on September 10, 2026 and Dermoscopy Two Step Algorithm on September 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*