# ABG Acid vs ABGs NOW! Lite

The clearest difference is review sentiment: ABG Acid at 63% against ABGs NOW! Lite's 0%. ABG Acid also leads on rating (4.6 vs 3.2) and ads (none vs shown). ABGs NOW! Lite's advantage is monetization model (ad-supported vs paid) and update cadence (every 2 months vs every 5 months). On price, ratings volume, in-app purchases and device support there is nothing between them.

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

ABG Acid holds the better App Store score, 4.6 against 3.2. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews point the same way: 63% of ABG Acid's written reviews are positive against 0% of ABGs NOW! Lite's.

ABG Acid ships an update every 5 months, ABGs NOW! Lite every 2 months. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ABG Acid | ABGs NOW! Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (7 ratings)](https://appshunter.io/ios/app/abg-acid-base-eval/id426019807/reviews)** | [3.2 (5 ratings)](https://appshunter.io/ios/app/abgs-now-lite/id1497090235/reviews) |
| Number of ratings | **7** | 5 |
| Positive reviews | **63.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 1 MB | 94 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Joshua D. steinberg](https://appshunter.io/developer/374154837) | [Bytewise Studios, LLC](https://appshunter.io/developer/1496483402) |

## 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


### ABGs NOW! Lite

[App page](https://appshunter.io/ios/app/abgs-now-lite/id1497090235)

Master arterial blood gas interpretation with this engaging medical app. It offers a calculator for quick answers, practice modes with hints, and a challenge mode to test your skills. Detailed analysis is provided for any incorrect interpretations.

**Highlights:** ABG Calculator, Practice Mode with Hints, Challenge Mode, Detailed Analysis, Knowledge Strengthening

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ABG Acid free?

ABG Acid is free to download, with no in-app purchases.

### Is ABGs NOW! Lite free?

ABGs NOW! Lite is free to download, with no in-app purchases.

### Which has better reviews, ABG Acid or ABGs NOW! Lite?

ABG Acid is rated higher. ABG Acid averages 4.6 out of 5 from 7 ratings, while ABGs NOW! Lite averages 3.2 from 5 ratings.

### Do ABG Acid or ABGs NOW! Lite have ads?

ABGs NOW! Lite shows ads; ABG Acid does not.

### Which is updated more often, ABG Acid or ABGs NOW! Lite?

ABG Acid ships an update every 5 months, and ABGs NOW! Lite every 2 months. Most recently, ABG Acid was updated on October 23, 2026 and ABGs NOW! Lite on October 27, 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.*