The Difficult Airway App vs SplenoCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The Difficult Airway App
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.
- 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
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The Difficult Airway App (v.3.3) The Difficult Airway App™ is an essential tool for clinicians who manage emergency airways in any setting: the ED, ICU, in-patient unit or the many EMS practice environments. THE RIGHT DRUGS, THE RIGHT DOSES, THE RIGHT WAY! This app rapidly and easily selects the right drugs for RSI, automatically adjusting for obesity and hemodynamics. Pediatric dosing and equipment selection is a snap using the Broselow-Luten color system or the child's estimated weight. Stay out of trouble! The Difficult Airway App™ guides the user quickly and easily through important algorithms, predictors of the difficult airway, and the step-by-step approach to RSI taught in The Difficult Airway Course: Emergency™. The Difficult Airway App™ features: EASY, YET SOPHISTICATED ADULT AND PEDIATRIC DRUG DOSING • For adult dosing, a few simple clicks bring you to recommended doses that incorporate patient weight, body habitus and hemodynamics. • The pediatric drug dosing function incorporates the color-coded system created by James Broselow, MD and Robert C. Luten, MD for rapid, safe management of pediatric airway cases. • The option to customize your formulary means that only the drugs you use will appear in the recommendations. DECISION-MAKING SUPPORT • Straight-forward algorithms allow you to quickly determine the best approach to your patient’s airway. • Easy mnemonics walk you through predictors of a difficult airway, including difficult laryngoscopy (LEMON), difficult BMV (ROMAN), difficult extraglottic device use (RODS) and difficult cricothyrotomy (SMART). • Pearls of wisdom, based on evidence and expert opinion, are offered throughout. RAPID SEQUENCE INTUBATION • The 7 – Ps of RSI: a step-by-step guide for adult and pediatric patients. • Adult and pediatric RSI drug dosing. EDUCATIONAL RESOURCES • Richly detailed illustrations of the airway anatomy. • Links to information about The Difficult Airway Courses™. Created by Ron M. Walls, MD, Michael F. Murphy, MD and Robert C. Luten, MD. With significant updates by Calvin A. Brown III, MD.
SplenoCalc
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.
- Spleen size percentile calculation
- Height and gender correction
- Normal value-based algorithm
- Spleen length and volume data
- Additional informational insights
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Spleen size is significantly influenced by body height and gender. The Splenocalc App is designed to calculate approximate percentiles of an individual´s spleen size. The algorithm of the Splenocalc App is based on the height- and gender-corrected normal values for homeostatic spleen length and volume (for women between 155 and 179 cm and men between 165 and 199 cm body height), the Splenocalc App is performing these calculations and is providing additional information.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | The Difficult Airway App | SplenoCalc |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.1 (22 ratings) — better | 2.3 (6 ratings) |
| Positive reviews | 31.3% of reviews | 50.0% of reviews — better |
| Number of ratings | 22 — better | 6 |
| Update frequency | Every 10 months — better | Every 30 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #139 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 62 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Airway Management Education Center | THE VATRIX GmbH |
Customer experience
The Difficult Airway App
SplenoCalc
In-app purchases
The Difficult Airway App
No in-app purchases
SplenoCalc
No in-app purchases
Questions
Is The Difficult Airway App free?
Is SplenoCalc free?
Which has better reviews, The Difficult Airway App or SplenoCalc?
Do The Difficult Airway App or SplenoCalc have ads?
Which is updated more often, The Difficult Airway App or SplenoCalc?
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