# ECHO On vs Sonolex

The clearest difference is iOS requirement: ECHO On at 15.6 against Sonolex's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ECHO On | Sonolex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (14 ratings)](https://appshunter.io/ios/app/echo-on/id1519707786/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free | — |
| Size | 414 MB | 8 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Robert Arrigo](https://appshunter.io/developer/1519707788) | [Shalinder Singh](https://appshunter.io/developer/6774460940) |

## What reviewers say

### ECHO On

[App page](https://appshunter.io/ios/app/echo-on/id1519707786)

This medical education app helps users learn Transesophageal Echocardiography with a question bank, cognitive aid, case log, and reference library. It provides guidance on performing and interpreting a standard 28-view exam, including anatomy, function, and Doppler interrogations.

**Highlights:** Transesophageal Echocardiography education, Enlarging question bank, Rescue TEE cognitive aid, Case Log system, Perioperative Quick Reference library, Offline echo loops, Pathology, technique, and normal loop examples

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Sonolex

[App page](https://appshunter.io/ios/app/sonolex/id6774460938)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ECHO On free?

ECHO On is free to download, with no in-app purchases.

### Is Sonolex free?

Sonolex is free to download, with no in-app purchases.

### Do ECHO On or Sonolex have ads?

Neither ECHO On nor Sonolex shows ads.

### Which is updated more often, ECHO On or Sonolex?

ECHO On ships an update weekly, and Sonolex weekly. Most recently, ECHO On was updated on October 13, 2026 and Sonolex on October 8, 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.*