# The Difficult Airway App vs SplenoCalc

The clearest difference is price: SplenoCalc at Free against The Difficult Airway App's $4.99. SplenoCalc also leads on review sentiment (50% vs 31%). The Difficult Airway App's advantage is rating (4.1 vs 2.3) and update cadence (every 10 months vs every 30 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

SplenoCalc is free to download; The Difficult Airway App costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

The Difficult Airway App holds the better App Store score, 4.1 against 2.3. Both are backed by a comparable volume of ratings — 22 and 6 respectively. Written reviews complicate that: 31% of The Difficult Airway App's written reviews are positive against 50% of SplenoCalc's, so the app with the better star average is not the one people write more warmly about.

The Difficult Airway App ships an update every 10 months, SplenoCalc every 30 months. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | The Difficult Airway App | SplenoCalc |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.1 (22 ratings)](https://appshunter.io/ios/app/the-difficult-airway-app/id433176317/reviews)** | [2.3 (6 ratings)](https://appshunter.io/ios/app/splenocalc/id1005559584/reviews) |
| Number of ratings | **22** | 6 |
| Positive reviews | 31.3% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 30 months |
| Monetization | Paid | **Free** |
| Best chart rank | **#159** | — |
| Size | 62 MB | 25 MB |
| Requires iOS | **13.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Airway Management Education Center](https://appshunter.io/developer/433176320) | [THE VATRIX GmbH](https://appshunter.io/developer/1585823767) |

## What reviewers say

### The Difficult Airway App

[App page](https://appshunter.io/ios/app/the-difficult-airway-app/id433176317)

**Currently charting:** #159 Top Paid · Medical (US App Store)

This medical app assists clinicians in managing emergency airways by providing rapid drug selection and dosing for RSI. It offers decision-making support with algorithms and mnemonics for difficult airways, along with educational resources.

**Highlights:** Adult and pediatric drug dosing for RSI, Obesity and hemodynamic adjustments, Broselow-Luten color system integration, Difficult airway algorithms and predictors, Step-by-step RSI guidance, Customizable drug formulary, Airway anatomy illustrations

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

**In-app purchases:** none


### SplenoCalc

[App page](https://appshunter.io/ios/app/splenocalc/id1005559584)

This medical app calculates approximate spleen size percentiles based on user height and gender. It utilizes an algorithm derived from height- and gender-corrected normal values for spleen length and volume. The app provides additional informational insights related to these calculations.

**Highlights:** Spleen size percentile calculation, Height and gender correction, Normal value-based algorithm, Spleen length and volume data, Additional informational insights

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is The Difficult Airway App free?

The Difficult Airway App costs $4.99, with no in-app purchases.

### Is SplenoCalc free?

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

### Which has better reviews, The Difficult Airway App or SplenoCalc?

The Difficult Airway App is rated higher. The Difficult Airway App averages 4.1 out of 5 from 22 ratings, while SplenoCalc averages 2.3 from 6 ratings.

### Do The Difficult Airway App or SplenoCalc have ads?

Neither The Difficult Airway App nor SplenoCalc shows ads.

### Which is updated more often, The Difficult Airway App or SplenoCalc?

The Difficult Airway App ships an update every 10 months, and SplenoCalc every 30 months. Most recently, The Difficult Airway App was updated on November 1, 2026 and SplenoCalc on October 24, 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.*