# ECHO vs Acetabular Diagnosis Tool

The clearest difference is update cadence: Acetabular Diagnosis Tool at every 11 months against ECHO's every 26 months. ECHO's advantage is iOS requirement (9.0 vs 12.0). On price, ads, 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.

ECHO ships an update every 26 months, Acetabular Diagnosis Tool every 11 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | ECHO | Acetabular Diagnosis Tool |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 11 months** |
| Size | 59 MB | 30 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [GoodBarber](https://appshunter.io/developer/1475258056) | [Groupe Hospitalier Paris Saint-Joseph](https://appshunter.io/developer/1085526444) |

## What reviewers say

### ECHO

[App page](https://appshunter.io/ios/app/echo-loco/id493951025)

**Features:** macOS Compatibility

**In-app purchases:** none


### Acetabular Diagnosis Tool

[App page](https://appshunter.io/ios/app/acetabular-diagnosis-tool/id1122951278)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ECHO free?

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

### Is Acetabular Diagnosis Tool free?

Acetabular Diagnosis Tool is free to download, with no in-app purchases.

### Do ECHO or Acetabular Diagnosis Tool have ads?

Neither ECHO nor Acetabular Diagnosis Tool shows ads.

### Which is updated more often, ECHO or Acetabular Diagnosis Tool?

ECHO ships an update every 26 months, and Acetabular Diagnosis Tool every 11 months. Most recently, ECHO was updated on October 26, 2026 and Acetabular Diagnosis Tool on October 26, 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.*