QABA vs iGuyton
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
QABA
This medical app provides quantitative acid-base analysis by allowing users to input blood results. It calculates key variables like Strong Ion Difference and Net Unmeasured Ions, offering a color-coded results screen and a user guide. It's designed for medical professionals to aid in clinical decision-making.
- Quantitative Acid Base Analysis
- Blood result input
- Calculates SID, NUI, Atot
- Color-coded results screen
- Includes User Guide
- Supports additional lab values
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Quantitative Acid Base Analyser Download now and take your Acid Base Analysis to a new and quantitative level! Completely Free! ------------------------------------------------------------------ QABA is designed for Anaesthetic/ICU Consultants and Registrars, but may also be useful for other health and veterinary professionals QABA allows you to enter the blood results and quickly analyse the Acid Base disturbance as per a refinement of the Quantitative Acid Base Analysis introduced by P. Stewart in 1978 The App features: 'swipe' buttons for quick data entry, a colour coded results screen, with a text report & Gamblegram. The App also includes a brief introduction to understanding QABA and a User Guide. Just enter the levels of sodium, potassium, chloride, pH, CO2 and the App will calculate the results of the 3 independent variables that control blood plasma pH; CO2 Strong Ion Difference (SID) and Weak Acids (Atot), NB: Atot requires at least Albumin or Total Protein level. The app will also display the Net Unmeasured Ions (NUI). NUI is an advancement on the Strong Ion Gap used in Stewarts original equations which is comparable to the Anion Gap used in traditional acid base analysis. For added Analysis accuracy QABA can also accept the phosphate, ionised calcium, magnesium, sulphate, lactate, urate, albumin and total protein levels. This App is based on version 11.6 of the P Lloyd 'Quantitative Acid Base Analysis' in use at Hawkes Bay hospital, New Zealand. The App was written by Dr C Donald and supervised by Intensivists Dr M Park and Dr R Freebairn. ------------ Disclaimer Every effort has been made to make this anylser an accurate and useful clinical tool. However the results must be considered alongside the clinical context and the user assumes all liability/responsibility for the clinical decisions made based upon QABA's results
iGuyton
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iGuyton estimates the analogue of mean systemic filling pressure (Pmsa), the pressure gradient for venous return (Pvr) and heart efficiency (Eh) from six values you already have at the bedside: central venous pressure, mean arterial pressure, cardiac output, age, height and weight. No inspiratory holds, no circulatory arrest, no extra equipment. FREE • Bedside calculator (Parkin and Leaning, J Clin Monit Comput 2008): Pmsa, Pvr and Eh. • Results update as you type, with checks on impossible values. • "How to measure" guide with diagrams of the Guyton curves and of the effect of fluids and inotropes. IGUYTON PREMIUM • Guyton diagram: venous return line reaching zero flow at Pmsa, the operating point (CVP, cardiac output) and a schematic cardiac function curve; resistance to venous return (RVR), body surface area and the c coefficient. • Cases: keep your 10 most recent cases, each with as many measurements as you need (baseline, after fluids, after a vasopressor or inotrope…). • Trends of Pmsa, Pvr and Eh over time. • PDF report with results, diagrams, measurement table, trends, method and reference, ready to print or share. • Archive export and import to move your cases to another device. PRIVATE BY DESIGN No account, no analytics, no advertising. Cases and reports stay on your device. SUBSCRIPTION iGuyton Premium is an auto-renewing yearly subscription with a 7-day free trial for new subscribers. Payment is charged to your Apple Account at confirmation of purchase after the trial. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel it in your account settings. Terms of Use (Apple standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://iguyton.sonable.app/privacy-app.html FOR HEALTHCARE PROFESSIONALS iGuyton is intended for physicians and healthcare professionals in intensive care, anaesthesia and cardiology. Results are estimates from a published model and support, never replace, clinical judgement. It does not provide diagnoses or treatment recommendations.
Screenshots
Verdict
The clearest difference is in-app purchases: QABA at none against iGuyton's 1. QABA also leads on iOS requirement (12.0 vs 15.0). iGuyton's advantage is update cadence (every 15 months vs every 34 months). On price, ads and device support 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
Both are free to download. iGuyton sells 1 in-app purchase, starting at $9.99 per year. QABA asks for nothing beyond the download.
QABA ships an update every 34 months, iGuyton every 15 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.
| Parameter | QABA | iGuyton |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 91.7% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 34 months | Every 15 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 5 MB | 55 MB |
| Age rating | 12+ | 17+ |
| Developer | Calum Donald | Pietro Bertini |
In-app purchases
QABA
No in-app purchases
iGuyton
- iGuyton Premium7 Days trial$9.991 Year









