# Biblioteca Digital CBR vs US MSK

The clearest difference is in-app purchases: Biblioteca Digital CBR at none against US MSK's 2. US MSK's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. US MSK sells 2 in-app purchases, starting at $0.99 per month. Biblioteca Digital CBR asks for nothing beyond the download.

Biblioteca Digital CBR ships an update every 2 months, US MSK every 6 weeks. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Biblioteca Digital CBR | US MSK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 58 MB | 31 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Colégio Brasileiro de Radiologia e Diagnóstico por Imagem](https://appshunter.io/developer/1226501266) | [Azul Systems](https://appshunter.io/developer/1460850225) |

## What reviewers say

### Biblioteca Digital CBR

[App page](https://appshunter.io/ios/app/biblioteca-digital-cbr/id1226501267)

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

**In-app purchases:** none


### US MSK

[App page](https://appshunter.io/ios/app/us-msk/id1611606746)

This medical app serves as an atlas for musculoskeletal ultrasound imaging of the upper and lower limbs. It provides detailed visual guidance for diagnostic procedures. The app offers a free trial for its subscription plans.

**Highlights:** Musculoskeletal ultrasound atlas, Upper limb imaging, Lower limb imaging, Diagnostic guidance, Free trial available

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Annual | $9.99 | per year |


## Frequently asked questions

### Is Biblioteca Digital CBR free?

Biblioteca Digital CBR is free to download, with no in-app purchases.

### Is US MSK free?

US MSK is free to download, with in-app purchases available.

### Do Biblioteca Digital CBR or US MSK have ads?

Neither Biblioteca Digital CBR nor US MSK shows ads.

### Which is updated more often, Biblioteca Digital CBR or US MSK?

Biblioteca Digital CBR ships an update every 2 months, and US MSK every 6 weeks. Most recently, Biblioteca Digital CBR was updated on October 26, 2026 and US MSK on October 30, 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.*