# EchoRef — Ultrasonography Reference

> Ultrasonography educational reference for POCUS, TTE, TEE, and cardiac measurements. (iPhone/iPad app by Rishi Kumar.)

- Source: https://appshunter.io/ios/app/echoref/id1434016053 (this page in markdown: same URL + `.md`)
- Developer: [Rishi Kumar](https://appshunter.io/developer/1434016052)
- Category: Medical, Reference
- Price: Free
- Rating: 4.90/5 from 1,373 App Store ratings · 12 written reviews indexed
- Age rating: 17+
- Requires: iOS 26.0 · 105 MB
- Languages: American English
- Released: 2018-09-11
- Data updated: 2026-08-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/echoref/id1434016053/reviews.md

## What is EchoRef?

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

## Key features

- Point-of-care ultrasound (POCUS)
- Transthoracic echocardiography (TTE)
- Transesophageal echocardiography (TEE)
- Cardiac dimensions and valve measurements
- Hemodynamic and ultrasound calculations
- Interventional procedure lessons

## Recent user reviews (10 of 12)

All indexed reviews: https://appshunter.io/ios/app/echoref/id1434016053/reviews.md

### 5/5 — Solid app

*2026-01-06*

Really solid echo app with a ton of depth and detail. Well organized, easy to use, and genuinely useful for learning and real clinical work.

### 5/5 — Great Job keep up the work!!!

*2025-09-30*

I appreciate this app so much! It provides great reference and it has recently been updated. And it’s great if you want to understand an have a visual of the cardiovascular system. And many other functions

**Developer response:** That’s an incredibly kind review! Thank you!

### 5/5 — Incredible reference

*2025-05-28*

Phenomenal tool. Dr. Kumar really is one of the MedEd greats

**Developer response:** Thank you so much!!

### 5/5 — Echo tools

*2024-03-01*

I’m in school for adult echo and I love the app mainly because it has all the formulas in one location and convenient but all the other info and images are Extremely beneficial. Thank you for developing this helpful tool.

**Developer response:** Thanks for the kind words and support!

### 5/5 — Great App for Cardiac Sonographers

*2023-05-13, version 4.9*

I use this app every time I need to double check normal values while reporting. Saves me so much time trying to scour ASE and google for accurate up to date information. I have yet to utilize the videos but it’s nice that they are there.

### 5/5 — Very useful

*2022-09-12*

It is very simple and useful. I love this app.

**Developer response:** Very happy to hear that!

### 5/5 — Thank you.

*2022-01-12*

One word ‘excellent’.
I’m aspiring for Cardiology. This helps me a lot.

**Developer response:** Appreciate the kind words! Best of luck to you!

### 5/5 — Excellent

*2021-06-07*

Please we need iPad version, thanks.

### 5/5 — Great resource for anesthesia residents

*2021-03-10*

CA2 on my echo rotation! Thank you for creating and offering this app for as a free resource! I am very excited to show my attending tomorrow in the OR.

**Developer response:** Thanks so much for the kind words! Glad to know you like it!

### 5/5 — Love it

*2020-12-05, version 2.6*

Absolutely love this app.  Thanks for designing it!

## Frequently asked questions about EchoRef

### What is EchoRef?

EchoRef is a free educational reference app focused on ultrasonography. It covers point-of-care ultrasound (POCUS), transthoracic echocardiography (TTE), and transesophageal echocardiography (TEE). The app also includes information on cardiac dimensions, valve measurements, and hemodynamic calculations.

### What kind of educational content does EchoRef offer?

The app provides lessons on various aspects of echocardiography and ultrasonography, including interventional procedures and mechanical circulatory support. It aims to be a comprehensive resource for learning and reference in these medical fields.

### Is EchoRef a substitute for professional medical advice?

No, EchoRef is intended for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Users should always consult a qualified healthcare provider for any medical concerns.

### What are the system requirements for EchoRef?

EchoRef is available for iOS devices. Specific version requirements are not detailed in the provided description, but it is designed for mobile use on Apple's platform.

## Version history (last 5 releases)

### 6.1 — 2026-08-10

Added: LA Volume by Biplane Area-Length, LV Volume/EF by Biplane Area-Length, Regurgitant Volume/Fraction by Volumetric Doppler, Aortic Size Index, LV Global Longitudinal Strain, RV Free-Wall Strain / 3D RVEF, Pseudo-MAD video
Added: Measurement Guides to the calculators
Updated: Implemented related-link improvements across the app
Updated: Improved performance and search algorithm

### 6.0 — 2026-07-09

Updated: Completely refined the interface to better align with my other RKRef reference applications
Updated: Improved search with synonyms and category pages, added related content suggestions, enhanced notes and favorites, improved calculator copy buttons and list sorting, expanded the global toolbar, improved analytics and analytics controls, resized iPad anatomy and valve images, centralized links and note storage

### 5.9 — 2026-05-19

Added: Global search function (magnifying glass in top right)
Added: LV thrombus POCUS case
Added: On-X mitral valve with stuck leaflet and mitral PVL plug 3D TEE videos
Added: Calculators for aortic pulsatility index (API) and Wilkins Score
Updated: Small user interface tweaks, codebase optimizations

### 5.8 — 2025-12-22

Added: Calculators for Aortic Valve Area (Continuity), Stroke Volume & CO (LVOT), E/e′ Ratio, RVSP Estimate, Bernoulli Gradient, A–a Gradient
Updated: Calculator descriptions
Updated: Restructured cardiac equations section
Updated: Ultrasound physics and hemodynamic equations
Updated: User interface fixes throughout the app
Updated: Matomo SDK to 7.8.0

### 5.7 — 2025-11-10

Added: Hemodynamic and ultrasound equations
Added: Highlighting text when searching
Added: Slide to favorite or unfavorite calculations
Added: iPad interface
Update: Reduced boilerplate code
Update: Fixed native mitral stenosis values
Update: Restructured changelog scheme
Update: More subtle liquid glass for references

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## More apps by Rishi Kumar

- [CoagRef](https://appshunter.io/ios/app/coagref/id6748641864)
- [LabRef](https://appshunter.io/ios/app/labref/id6751020319)
- [EBMRef](https://appshunter.io/ios/app/ebmref/id6751447390)
- [VentRef](https://appshunter.io/ios/app/ventref/id6756503414)
- [ECGRef](https://appshunter.io/ios/app/ecgref/id6757675855)

All apps by Rishi Kumar: https://appshunter.io/developer/1434016052

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*