EchoRef vs Prepry
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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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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.
Prepry
Prepare for your ultrasound registry exams with a comprehensive study tool. Access a vast question bank, anatomy images, and expert-led video courses. Master key sonography topics and track your progress with smart study features.
- Massive question bank (5,600+ questions)
- Hundreds of anatomy images
- Expert-led video courses
- Spaced Repetition algorithm
- Custom exam builder
- Progress tracking and analysis
- Offline study capability
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Prepry is the ultrasound registry review built so you want to study every day. 100,000+ sonography students have studied with Prepry for their ARDMS®, CCI®, and ARRT® registry exams, with a 99.0% reported pass rate among full-access students. Take timed mock exams, see exactly where you are weak, and drill those areas until your readiness score says you are ready. Missed questions come back on a spaced repetition schedule until you master them. Earn your RDMS®, RVT®, RDCS®, RCS®, or RVS® credential. Content created by RDMS®, RVT®, and RDCS® educators. Built by an RVT who taught vascular ultrasound. NEW: ULTRASOUND PROTOCOLS Scanning protocol videos, step by step checklists by body region, and normal measurement ranges, so you know exactly what to capture in clinicals. NEW: CHALLENGE MODE Questions appear without the answer choices, so you recall the answer from memory instead of recognizing it. Not sure? Work through the options one at a time and eliminate the wrong ones, just like on exam day. NEW: CLINICAL Track clinicals. Clock in and out, see weekly hours, log each exam in seconds, and follow your skills progress, with protocols and measurement references one tap away. MOCK EXAMS AND READINESS • Timed Mock Exams that simulate real registry conditions. • NEW Exam Simulator: a locked screen layout modeled on the test center, so exam day feels familiar. • Weak area identification and chapter by chapter breakdown after every mock. • NEW Score Trends: see your quiz scores climb. • AI Readiness Score: tells you when you are exam ready. • Study Planner: a day by day schedule built from your exam date. QUESTION BANK (9,400+ Questions) • ARDMS® SPI Ultrasound Physics: 1,150 • ARDMS® Abdomen (AB): 1,060 • ARDMS® OB/GYN: 715 • ARDMS® Adult Echocardiography (AE): 710 • ARDMS® Vascular Technology (VT): 700 • ARDMS® MSK Sonography: 660 • ARDMS® Pediatric Sonography (PS): 390 • ARDMS® Breast Sonography (BR): 370 • ARDMS® Fetal Echocardiography (FE): 170 • CCI® Registered Cardiac Sonographer (RCS®) • CCI® Registered Vascular Specialist (RVS®) • ARRT® Sonography, Breast Sonography, Vascular Sonography Step by step explanations for every answer, with video explanations on select questions. 750+ SONOGRAPHIC IMAGES Anatomy, pathology, and diagnostic imaging across every specialty. BUILT FOR DAILY STUDY • Streaks that keep you on track, plus exam countdown, study reminders, and daily goals. • Flashcards with spaced repetition scheduling. • Quiz Builder: custom quizzes in seconds by chapter, topic, or difficulty. • Free Question of the Day and Quick 10 quizzes. • Study Blocks for focused review sessions. • Badges and XP. AI STUDY TOOLS • AI Explanations: instant breakdowns of any question. • AI Video Tutor: ask questions during video lessons. VIDEO COURSES SPI Ultrasound Physics, Abdomen, Vascular Technology, and OB/GYN. Expert-created lessons with transcripts, speed control, and in-video notes. Free lessons available. PASS GUARANTEE Did not pass? Get 3 extra months free. MORE • Dark mode and offline access. Also on Android and web (app.prepry.com). • Notes linked to questions, explanations, and video timestamps. • Educator portal with cohort management, assignments, and analytics. For sonography students, DMS graduates, and working sonographers. Not for clinical use or medical advice. Subscriptions can be managed and auto-renewal turned off in App Store Settings after purchase. Refunds will not be provided for any unused portion of the term. - https://www.prepry.com/privacy-policy - https://www.prepry.com/terms-of-service - https://www.prepry.com/disclaimer ARDMS®: American Registry for Diagnostic Medical Sonography CCI®: Cardiovascular Credentialing International ARRT®: American Registry of Radiologic Technologists This app is not affiliated with or endorsed by the above organizations. All trademarks belong to their respective holders.
Screenshots
Verdict
EchoRef and Prepry both sit at 4.9 stars, but that hides the real split: 100% of EchoRef's written reviews are positive against 54% of Prepry's. EchoRef also leads on in-app purchases (none vs 9). Prepry's advantage is update cadence (every 5 days vs every 2 months) and chart position (#24 vs unranked). On price, rating, ratings volume and ads 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. Prepry sells 9 in-app purchases, starting at $49.99 per month. EchoRef asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for EchoRef against 4.8 for Prepry. Both are backed by a comparable volume of ratings — 1.4K and 3.9K respectively. Written reviews are what separate them: 100% of EchoRef's written reviews are positive against 54% of Prepry's.
EchoRef ships an update every 2 months, Prepry every 5 days. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.
| Parameter | EchoRef | Prepry |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (1.4K ratings) — better | 4.8 (3.9K ratings) |
| Positive reviews | 100.0% of reviews — better | 53.7% of reviews |
| Number of ratings | 1.4K | 3.9K — better |
| Update frequency | Every 2 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | — | #24 — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 104 MB | 169 MB |
| Age rating | 17+ | 4+ |
| Developer | Rishi Kumar | Imago AI LLC |
Customer experience
EchoRef
Prepry
Bugs and requests
EchoRef
Not enough reviews yet to summarise bugs or requests.
Prepry
Reported bugs
4 issues- App crashing/not loading
- Incorrect answer markings
- Progress not saving
- Repeated questions
Requested features
4 requests- More difficult questions to match actual exams
- Ability to filter/focus on specific topics
- Echocardiography exam preparation
- Ability to review/study past questions
In-app purchases
EchoRef
No in-app purchases
Prepry
- Prepry Pro (1 Month)$49.991 Month
- Prepry Pro (3 Months)$149.003 Months
- Prepry Premium Quarterly$149.993 Months
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- Prepry Premium Annual$199.991 Year
- Prepry Pro (3 Months)$89.99
- Prepry Pro (6 Months)$99.99
- Prepry Pro (1 Year)$119.99
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- Lifetime Subscription$399.99
- Unlimited Access$399.99








