# ABG Acid vs Dermoscopy Two Step Algorithm

The clearest difference is monetization model: Dermoscopy Two Step Algorithm at free against ABG Acid's paid. Dermoscopy Two Step Algorithm also leads on review sentiment (100% vs 68%) and iOS requirement (10.0 vs 13.0). On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.6 for ABG Acid against 4.6 for Dermoscopy Two Step Algorithm. Both are backed by a comparable volume of ratings — 7 and 10 respectively. Written reviews are what separate them: 68% of ABG Acid's written reviews are positive against 100% of Dermoscopy Two Step Algorithm's.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ABG Acid | Dermoscopy Two Step Algorithm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (7 ratings)](https://appshunter.io/ios/app/abg-acid-base-eval/id426019807/reviews) | [4.6 (10 ratings)](https://appshunter.io/ios/app/dermoscopy-two-step-algorithm/id731753300/reviews) |
| Number of ratings | 7 | **10** |
| Positive reviews | 67.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | Paid | **Free** |
| Size | 1 MB | 220 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Joshua D. steinberg](https://appshunter.io/developer/374154837) | [Usatine & Erickson Media LLC](https://appshunter.io/developer/1466894388) |

## What reviewers say

### ABG Acid

[App page](https://appshunter.io/ios/app/abg-acid-base-eval/id426019807)

This app guides clinicians through analyzing ABGs and electrolytes to identify acid-base disorders and diagnostic ideas for ill patients. It teaches a stepwise thinking process and provides differential diagnoses with explanations, aiding patient care and clinician learning.

**Highlights:** Stepwise ABG and electrolyte analysis, Identifies acid-base disorders, Provides diagnostic ideas, Teaches critical thinking process, Includes differential diagnoses mnemonics, Calculates predicted pCO2 and corrected bicarbonate

**Features:** macOS Compatibility

**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 ABG Acid free?

ABG Acid 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, ABG Acid or Dermoscopy Two Step Algorithm?

ABG Acid and Dermoscopy Two Step Algorithm are both rated 4.6 out of 5 on the App Store, from 7 and 10 ratings respectively.

### Do ABG Acid or Dermoscopy Two Step Algorithm have ads?

Neither ABG Acid nor Dermoscopy Two Step Algorithm shows ads.

### Which is updated more often, ABG Acid or Dermoscopy Two Step Algorithm?

ABG Acid ships an update every 5 months, and Dermoscopy Two Step Algorithm every 5 months. Most recently, ABG Acid was updated on October 8, 2026 and Dermoscopy Two Step Algorithm on October 13, 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.*