# teraquiz vs US MSK

The clearest difference is in-app purchases: teraquiz at none against US MSK's 2. teraquiz also leads on review sentiment (83% vs 50%) and update cadence (fortnightly vs every 6 weeks). US MSK's advantage is iOS requirement (13.0 vs 15.0). On price, ads, monetization model 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. teraquiz asks for nothing beyond the download.

teraquiz ships an update fortnightly, US MSK every 6 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | teraquiz | US MSK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/teraquiz/id1603222290/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | **83.3% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 60 MB | 31 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [TERAQUIZ LTDA](https://appshunter.io/developer/1603222292) | [Azul Systems](https://appshunter.io/developer/1460850225) |

## What reviewers say

### teraquiz

[App page](https://appshunter.io/ios/app/teraquiz/id1603222290)

Engage in gamified learning for medical professionals. Access a newsletter, video courses, and expert-commented questions based on scientific evidence.

**Highlights:** Gamified learning methodology, Newsletter updates, Video courses, Expert-commented questions, High-level scientific evidence

**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 teraquiz free?

teraquiz 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 teraquiz or US MSK have ads?

Neither teraquiz nor US MSK shows ads.

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

teraquiz ships an update fortnightly, and US MSK every 6 weeks. Most recently, teraquiz was updated on November 3, 2026 and US MSK on November 3, 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.*