EF vs EchoRef
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EF
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EF: ejection fraction, an iPhone and Apple Watch application, can calculate ejection fraction easily. Teichholz formula is used to calculate EF.
EchoRef
This educational reference app provides comprehensive information on point-of-care ultrasound (POCUS), echocardiography, and cardiac measurements. It includes lessons on interventional procedures and hemodynamic calculations for medical professionals.
- Point-of-care ultrasound (POCUS)
- Transthoracic echocardiography (TTE)
- Transesophageal echocardiography (TEE)
- Cardiac dimensions and valve measurements
- Hemodynamic and ultrasound calculations
- Interventional procedure lessons
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EchoRef is a free iOS ultrasonography educational reference covering point-of-care ultrasound (POCUS), transthoracic echocardiography (TTE), and transesophageal echocardiography (TEE). Additionally, it contains cardiac dimensions, native/prosthetic valve measurements, hemodynamic/ultrasound calculations, and lessons ranging from interventional procedures to mechanical circulatory support. This app is intended for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you may have regarding a medical condition, and never disregard or delay seeking professional advice because of information provided by this app. About Rishi Kumar, MD, FACC ("RK.MD") I'm an adult cardiothoracic anesthesiologist and cardiovascular ICU intensivist practicing in academic medicine. I'm passionate about teaching with free, open-access medical education. Learn more on my site: https://rk.md
Screenshots
Verdict
The clearest difference is update cadence: EchoRef at every 2 months against EF's every 48 months. EF's advantage is device support (4 vs 2) and iOS requirement (12.0 vs 26.0). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
EF ships an update every 48 months, EchoRef every 2 months. The most recent releases landed on October 1, 2026 and October 11, 2026 respectively.
| Parameter | EF | EchoRef |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.9 (1.4K ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1.4K — better |
| Update frequency | Every 48 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 22 MB | 105 MB |
| Age rating | 17+ | 17+ |
| Developer | Keiji Matsui | Rishi Kumar |
In-app purchases
EF
No in-app purchases
EchoRef
No in-app purchases
