Comparison

EchoRef vs SonoSim

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

Head to head
About

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.

Highlights
  • Point-of-care ultrasound (POCUS)
  • Transthoracic echocardiography (TTE)
  • Transesophageal echocardiography (TEE)
  • Cardiac dimensions and valve measurements
  • Hemodynamic and ultrasound calculations
  • Interventional procedure lessons
Features
Read full description

Echocardiography and point-of-care ultrasound organized for the bedside. EchoRef is a comprehensive echocardiography and ultrasound reference for physicians, nurses, advanced practice clinicians, sonographers, medical students, and other healthcare learners. Review TEE, TTE, and POCUS videos, check cardiac measurements and diagnostic criteria, evaluate native and prosthetic valves, and perform commonly used ultrasound and hemodynamic calculations, all in one focused reference. FEATURES • Educational video library covering 2D and 3D TEE, interventional echocardiography, mechanical circulatory support, and clinical cases • POCUS instruction for cardiac, lung, abdominal, vascular, and peripheral nerve block examinations • Cardiac anatomy measurements and reference values for chamber size, ventricular function, diastology, and vascular structures • Native valve assessment for aortic, mitral, tricuspid, and pulmonic stenosis and regurgitation • Prosthetic valve reference for surgical valves, TAVR, and prosthesis evaluation • Ultrasound and hemodynamic calculators for valve area, cardiac output, ventricular function, filling pressures, vascular resistance, shunts, fluid responsiveness, and more • Cardiac equations, hemodynamic reference values, and ultrasound physics • Clinical protocols, focused examination guidance, findings atlas, and reporting documentation • Acquisition guidance, measurement tips, common pitfalls, and related clinical content • Global search, favorites, related links, and personal notes EchoRef connects ultrasound physics, image acquisition, echocardiographic interpretation, and bedside decision-making. Whether you are learning standard views, reviewing an unfamiliar finding, evaluating valve disease, or checking a calculation, the app makes relevant information easy to find. Created by Rishi Kumar, MD, FACC (“RK.MD”), an academic adult cardiothoracic anesthesiologist and cardiovascular ICU intensivist committed to free, open-access medical education. Learn more at https://rk.md EchoRef is intended for educational and informational purposes only. It does not provide medical advice and is not a substitute for professional judgment, diagnosis, or treatment. Clinical findings and calculations must be independently verified and interpreted in the context of the individual patient. Seek guidance from a qualified healthcare professional regarding any medical condition. Do not disregard or delay professional medical advice because of information provided by this app.

About

SonoSim

This app provides members with quick access to ultrasound education, imaging protocols, and reference guides, usable both online and offline. It features a library of courses, concise summaries of key concepts, and helpful tips for bedside use.

Highlights
  • Access to 80+ peer-reviewed courses
  • Concise key concept summaries
  • Bedside reference guides
  • Offline access to content
  • Case-based ultrasound education
Read full description

The SonoSim App, available exclusively to SonoSim members, provides access to critical ultrasound knowledge quickly - both on- and offline. Get access to ultrasound education, imaging protocols, and sonographic reference guides, whether learning at home or needing a quick refresher at the bedside. Join over 120,000 members of the patented SonoSim Ecosystem of Case-Based Ultrasound Education, the easiest way to learn & teach ultrasonography (TM). SonoSim Course Library - Access 80+ peer-reviewed SonoSim Courses by leading ultrasound experts and educators. Key Concepts - Short on time or need a quick refresher on an ultrasound topic? Access concise summaries that highlight key elements of SonoSim Courses. Bedside Reference – Need ultrasound tips at the bedside? Quickly find helpful hints and key imaging criteria.

Screenshots

EchoRef4 screens
SonoSim4 screens

Verdict

The call

The clearest difference is ads: EchoRef at none against SonoSim's shown. EchoRef also leads on review sentiment (100% vs 67%) and rating (4.9 vs 4.5). SonoSim's advantage is iOS requirement (9.0 vs 26.0). On price, update cadence, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

EchoRef holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: EchoRef has 1.4K ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 100% of EchoRef's written reviews are positive against 67% of SonoSim's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
EchoRef versus SonoSim: the parameters behind the verdict, then further details
ParameterEchoRefSonoSim
PriceFreeFree
Rating4.9 (1.4K ratings) — better4.5 (8 ratings)
Positive reviews100.0% of reviews — better66.7% of reviews
Number of ratings1.4K — better8
Update frequencyEvery 2 monthsEvery 2 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.09.0 — better
Further details — not scored
Size104 MB22 MB
Age rating17+12+
DeveloperRishi KumarSonoSim, Inc.

Customer experience

EchoRef

All ratings1,387 ratings
Positive97.2%
Neutral1.4%
Negative1.4%
Written reviews12 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SonoSim

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

None

EchoRef

No in-app purchases

None

SonoSim

No in-app purchases

Questions

Is EchoRef free?
EchoRef is free to download, with no in-app purchases.
Is SonoSim free?
SonoSim is free to download, with no in-app purchases.
Which has better reviews, EchoRef or SonoSim?
EchoRef is rated higher. EchoRef averages 4.9 out of 5 from 1.4K ratings, while SonoSim averages 4.5 from 8 ratings.
Do EchoRef or SonoSim have ads?
SonoSim shows ads; EchoRef does not.
Which is updated more often, EchoRef or SonoSim?
EchoRef ships an update every 2 months, and SonoSim every 2 months. Most recently, EchoRef was updated on November 2, 2026 and SonoSim on November 3, 2026.

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