# EchoRef vs SonoSim

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.

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

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.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 18, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | EchoRef | SonoSim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (1.4K ratings)](https://appshunter.io/ios/app/echoref/id1434016053/reviews)** | [4.5 (8 ratings)](https://appshunter.io/ios/app/sonosim/id1462648333/reviews) |
| Number of ratings | **1.4K** | 8 |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 105 MB | 22 MB |
| Requires iOS | 26.0 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Rishi Kumar](https://appshunter.io/developer/1434016052) | [SonoSim, Inc.](https://appshunter.io/developer/1462648332) |

## What reviewers say

### EchoRef

[App page](https://appshunter.io/ios/app/echoref/id1434016053)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### SonoSim

[App page](https://appshunter.io/ios/app/sonosim/id1462648333)

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

**In-app purchases:** none


## Frequently asked 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 September 18, 2026 and SonoSim on September 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*