Comparison

Echo Calculate vs Observe.

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Echo Calculate

Features
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Echo Calculate is a clinical reference and calculation tool designed for echocardiography and cardiovascular assessment workflows. Quickly access structured calculators, reference ranges, patient measurement tracking, and trend-based follow-up tools in one place. KEY FEATURES Clinical Calculators Access organised calculation categories for: • Aortic, mitral, pulmonary and tricuspid valve assessment • Hemodynamics • Left ventricular function • Right ventricular function • Diastolic function • Body size calculations • Chamber size and indexing • Regurgitation assessment • Doppler utilities Patient Measurement Tracking Create local patient profiles and record dated cardiovascular measurements over time. Track values such as: • Aortic Valve Area (AVA) • Mitral Valve Area (MVA) • Pressure gradients • Body Surface Area (BSA) • Body Mass Index (BMI) • Doppler measurements • Chamber measurements • Additional echocardiographic parameters Follow-Up Overview Echo Calculate organises patient records into a clear follow-up overview, helping users review stored measurements and identify which records may require closer attention. Automatic Reports Generate structured summaries from saved measurements. Reports combine dated records, measurement values and trend information into an easy-to-read format. Clinical Reference Ranges Access organised cardiovascular reference ranges and supporting information directly inside the app. Fast Search Quickly find calculations and measurements using familiar abbreviations and terms such as AVA, EF, RVSP, PISA, E/e′ and more. Multi-Language Support Use the app in multiple supported languages through the built-in language selector. Designed for Practical Use Echo Calculate features a clean, structured interface designed for fast access during study, education and professional clinical workflows. IMPORTANT MEDICAL DISCLAIMER Echo Calculate is intended as a calculation, education and clinical reference support tool. It does not provide a medical diagnosis and does not replace professional clinical judgement, medical examination, official guidelines or advice from a qualified healthcare professional. All calculated results and generated reports must be independently reviewed and interpreted in the context of the complete clinical picture. For medical concerns or emergencies, contact a qualified healthcare professional or emergency service.

About

Observe.

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Observe, user-friendly app designed for healthcare professionals to assess heart failure with preserved ejection fraction, featuring the Heart Failure Association (HFA) of the European Society of Cardiology (ESC) scoring systems: HFA-PEFF and H2FPEF (U.S. Score) guidelines. A precise tool to calculate HFpEF risk score using functional, morphological, and biomarker data. It gives a probability and percentage estimation of HFpEF, aiding diagnosis. However, it's not a substitute for professional medical advice or diagnosis. Healthcare providers should rely on comprehensive medical evaluations and their expertise when interpreting results.

Screenshots

Echo Calculate4 screens
Observe.4 screens

Verdict

The call

The clearest difference is in-app purchases: Observe. at none against Echo Calculate's 1. Observe. also leads on iOS requirement (13.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Echo Calculate sells 1 one-off in-app purchase. Observe. asks for nothing beyond the download.

UpkeepUpdate frequency

Echo Calculate ships an update every 6 months, Observe. every 8 months. The most recent releases landed on September 16, 2026 and September 15, 2026 respectively.

Scorecard2 real differences Ā· 4 level
Echo Calculate versus Observe.: the parameters behind the verdict, then further details
ParameterEcho CalculateObserve.
PriceFreeFree
Update frequencyEvery 6 months — betterEvery 8 months
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size26 MB29 MB
Age rating4+4+
DeveloperGundogan EmreSELECT ICT Systems SAE

In-app purchases

1 purchases

Echo Calculate

One-time1
  • Echo Calculate Premium$3.99
None

Observe.

No in-app purchases

Questions

Is Echo Calculate free?
Echo Calculate is free to download, with in-app purchases available.
Is Observe. free?
Observe. is free to download, with no in-app purchases.
Do Echo Calculate or Observe. have ads?
Neither Echo Calculate nor Observe. shows ads.
Which is updated more often, Echo Calculate or Observe.?
Echo Calculate ships an update every 6 months, and Observe. every 8 months. Most recently, Echo Calculate was updated on September 16, 2026 and Observe. on September 15, 2026.

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