# Perseus vs TracPatch Knee HCP

The clearest difference is device support: TracPatch Knee HCP at 3 against Perseus's 1. Perseus's advantage is iOS requirement (9.3 vs 12.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Perseus ships an update every 3 months, TracPatch Knee HCP every 2 months. The most recent releases landed on September 20, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Perseus | TracPatch Knee HCP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 71 MB | 50 MB |
| Requires iOS | **9.3** | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Orthokey Italia s.r.l.](https://appshunter.io/developer/899950138) | [Consensus Orthopedics](https://appshunter.io/developer/1434767853) |

## What reviewers say

### Perseus

[App page](https://appshunter.io/ios/app/perseus/id899950135)

**Features:** macOS Compatibility

**In-app purchases:** none


### TracPatch Knee HCP

[App page](https://appshunter.io/ios/app/tracpatch-knee-hcp/id1434767855)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Perseus free?

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

### Is TracPatch Knee HCP free?

TracPatch Knee HCP is free to download, with no in-app purchases.

### Do Perseus or TracPatch Knee HCP have ads?

Neither Perseus nor TracPatch Knee HCP shows ads.

### Which is updated more often, Perseus or TracPatch Knee HCP?

Perseus ships an update every 3 months, and TracPatch Knee HCP every 2 months. Most recently, Perseus was updated on September 20, 2026 and TracPatch Knee HCP on October 2, 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.*