EchoCalc vs Cardio Z
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EchoCalc
Access essential echocardiography reference data for clinical practice. Includes measurements, diastolic function, prosthetic valve data, and topic guides. Supports multiple reference standards and recent guidelines.
- Echocardiography reference data
- LV/RV size & function
- Diastolic function data
- Prosthetic valve reference
- Topic guides with explanations
- Multiple reference standards (BSE, ASE, EACVI)
- Access to recent guidelines
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EchoCalc provides access to all the key echocardiography reference data commonly used in clinical practice: - LV/RV size & function, LV mass, aortic dimensions, atrial dimensions - Diastolic function - Prosthetic aortic & mitral valve reference data - Topic guides on each chapter with how-to explanations on how to measure and interpret echo data - Updated to the latest BSE reference data but also allows switching to ASE/EACVI references - Access to a mobile-friendly version of all recent BSE guidelines: - Standard TTE Study - Standard TOE Study - Outpatient Indications - Inpatient Indications - Aortic Stenosis - Aortic Regurgitation - Mitral Valve - Tricuspid & Pulmonary Valves - Right Heart - Pulmonary Hypertension - Diastolic Dysfunction - Cardio-Oncology - Hypertrophic Cardiomyopathy - Valve Replacement - Stress Echo - Restrictive Cardiomyopathy - ARVC - Marfan Syndrome - Congenital
Cardio Z
This medical app provides instant Z-scores and centiles for pediatric cardiology measurements. It simplifies the calculation of vital cardiac and pediatric parameters, offering guidance and saving patient data for easy sharing. Designed for healthcare professionals, it streamlines clinical assessments and monitoring.
- Instant Z-score and centile calculations
- Supports numerous cardiac and pediatric measurements
- Offline functionality
- Patient data saving and sharing
- Customizable user settings
- Guidance tips for measurements
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Instant Z-Scores For All The Paediatric Cardiology Parameters You Review Everyday. Cardio Z has been developed by the experienced Paediatric Cardiology team at Evelina Children's Hospital, London, UK in collaboration with the technology company UBQO. The application makes it easy to calculate Z-scores and centiles for the many cardiac and paediatric measurements that are made in normal clinical practice. Cardio Z distils a wealth of clinical research parameters into a single accessible format. Z–scores and centiles are a means of expressing how far a measurement is above (positive Z-score) or below (negative Z-score) the average for the size or age of a patient. They are particularly important in assessing and monitoring growing patients, from fetal life though to adulthood. Health professionals need to be able to access the normal ranges for cardiac parameters at every age and size, and cross-checking of measurements can be time-consuming and inconvenient. Cardio Z will prove invaluable for both clinicians working directly in Paediatric Cardiology, and those who work in other fields of Paediatrics. Cardio Z allows users to access Z-scores without the need for an internet connection, or the requirement to input the same data in multiple calculators. Users can define their own settings so that they can be sure that their use of z-scores is consistent over time, whilst still allowing flexibility for the experienced clinician. Comprehensive guidance is available ensuring that measurements are consistent with those of the original research, allowing valid comparisons. Cardio-Z creates a summary of all z-scores for each patient, which can then be saved, e-mailed or printed. Simple, reliable and time-saving. FULL LIST OF FEATURES: - Cardio Z allows calculation of z-scores of: - Height, weight, BMI and head circumference - Clinic blood pressure, with calculation of a user-defined 'target centile' blood pressure - Echocardiographic measurements of most cardiac structures, including valves, chambers, vessels and coronary arteries - Fetal echocardiographic measurements, using gestational age, femur length or biparietal diameter as size reference - M-mode echocardiography, including TAPSE - Pulsed wave velocities, including E/E' ratio and E/A ratio - Tissue Doppler velocities and time intervals. Including Isovolumetric Contraction Time (IVCT), Isovolumetric Relaxation Time (IVRT), Ejection Time and Myocardial Performance Index - Discriminant scores for neonatal aortic stenosis with borderline left ventricle - ECG parameters (2nd and 98th centiles) and corrected QT interval calculation EXTRA FEATURES: - Guidance tips for measurements, including diagrams and notes of the methods of the original researchers - Centiles, as well as z-scores, displayed for all parameters - No need to re-enter height and weight: baseline data only needs to be entered once - Generation of a .pdf summary which can be saved, e-mailed or printed - Saved patient Z-score summaries can be accessed and edited at a later date - Short-cut keys for frequently used parameters - Body surface area calculator can be defined to use the same algorithms as the original research - Cardio Z reduces the inconvenience of making Z-score calculations, and improves the correct application of this important clinical tool. The App is not a substitute for clinical judgement or institutional policies, thus it should complement and not replace normal procedures for making clinical decisions. We hope you enjoy using Cardio Z!
Screenshots
Verdict
The clearest difference is price: EchoCalc at Free against Cardio Z's $6.99. EchoCalc also leads on update cadence (monthly vs every 21 months) and ratings volume (23 vs 3). Cardio Z's advantage is rating (4.0 vs 2.3) and in-app purchases (none vs 3). On ads, 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
EchoCalc is free to download; Cardio Z costs $6.99 up front. EchoCalc sells 3 one-off in-app purchases. Cardio Z asks for nothing beyond the download.
Cardio Z holds the better App Store score, 4.0 against 2.3. That said, the two scores are not equally well evidenced: EchoCalc has 23 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 49% of EchoCalc's written reviews are positive against 61% of Cardio Z's.
EchoCalc ships an update monthly, Cardio Z every 21 months. The most recent releases landed on October 14, 2026 and October 15, 2026 respectively.
| Parameter | EchoCalc | Cardio Z |
|---|---|---|
| Price | Free — better | $6.99 |
| Rating | 2.3 (23 ratings) | 4.0 (3 ratings) — better |
| Positive reviews | 48.8% of reviews | 61.1% of reviews — better |
| Number of ratings | 23 — better | 3 |
| Update frequency | Monthly — better | Every 21 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 15 MB |
| Age rating | 17+ | 4+ |
| Developer | British Society of Echocardiography | UBQO Limited |
Customer experience
EchoCalc
Cardio Z
In-app purchases
EchoCalc
- Donate £2 to BSE$1.99
- Donate £5 to BSE$4.99
- Donate £10 to BSE$9.99
Cardio Z
No in-app purchases







