# Zanno vs US MSK

The clearest difference is in-app purchases: Zanno at none against US MSK's 2. US MSK's advantage is update cadence (every 6 weeks vs every 13 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Zanno ships an update every 13 months, US MSK every 6 weeks. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Zanno | US MSK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 6 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 31 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Cristiano Bolla Fernandes](https://appshunter.io/developer/462462768) | [Azul Systems](https://appshunter.io/developer/1460850225) |

## What reviewers say

### Zanno

[App page](https://appshunter.io/ios/app/zanno/id1258754321)

**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 Zanno free?

Zanno 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 Zanno or US MSK have ads?

Neither Zanno nor US MSK shows ads.

### Which is updated more often, Zanno or US MSK?

Zanno ships an update every 13 months, and US MSK every 6 weeks. Most recently, Zanno 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.*