# Primal's 3D Knee vs SonoHipAngles

The clearest difference is price: Primal's 3D Knee at Free against SonoHipAngles's $12.99. Primal's 3D Knee also leads on update cadence (every 2 months vs every 21 months) and iOS requirement (15.0 vs 17.6). SonoHipAngles's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Primal's 3D Knee is free to download; SonoHipAngles costs $12.99 up front. Primal's 3D Knee sells 1 one-off in-app purchase. SonoHipAngles asks for nothing beyond the download.

Primal's 3D Knee ships an update every 2 months, SonoHipAngles every 21 months. The most recent releases landed on October 25, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Primal's 3D Knee | SonoHipAngles |
| --- | --- | --- |
| Price | **Free** | $12.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 21 months |
| Size | 125 MB | 2 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Pharma Intelligence UK Ltd](https://appshunter.io/developer/1678054030) | [ORTHOPRACTIS.COM SINGLE MEMBER P.C.](https://appshunter.io/developer/1286360877) |

## What reviewers say

### Primal's 3D Knee

[App page](https://appshunter.io/ios/app/primals-3d-knee/id1658547427)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Primal's 3D Knee | $39.99 | one-time |


### SonoHipAngles

[App page](https://appshunter.io/ios/app/sonohipangles/id6736592260)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Primal's 3D Knee free?

Primal's 3D Knee is free to download, with in-app purchases available.

### Is SonoHipAngles free?

SonoHipAngles costs $12.99, with no in-app purchases.

### Do Primal's 3D Knee or SonoHipAngles have ads?

Neither Primal's 3D Knee nor SonoHipAngles shows ads.

### Which is updated more often, Primal's 3D Knee or SonoHipAngles?

Primal's 3D Knee ships an update every 2 months, and SonoHipAngles every 21 months. Most recently, Primal's 3D Knee was updated on October 25, 2026 and SonoHipAngles on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*