# Parabon CTX Study App vs Axes Physical Therapy

The clearest difference is update cadence: Parabon CTX Study App at every 3 weeks against Axes Physical Therapy's every 3 months. Parabon CTX Study App also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

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

Parabon CTX Study App ships an update every 3 weeks, Axes Physical Therapy every 3 months. The most recent releases landed on October 6, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Parabon CTX Study App | Axes Physical Therapy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 10 MB | 32 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Parabon NanoLabs, Inc.](https://appshunter.io/developer/1401016241) | [Axes Physical Therapy, LLC](https://appshunter.io/developer/1727396120) |

## What reviewers say

### Parabon CTX Study App

[App page](https://appshunter.io/ios/app/parabon-ctx-study-app/id6444806840)

**In-app purchases:** none


### Axes Physical Therapy

[App page](https://appshunter.io/ios/app/axes-physical-therapy/id6476626573)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Parabon CTX Study App free?

Parabon CTX Study App is free to download, with no in-app purchases.

### Is Axes Physical Therapy free?

Axes Physical Therapy is free to download, with no in-app purchases.

### Do Parabon CTX Study App or Axes Physical Therapy have ads?

Neither Parabon CTX Study App nor Axes Physical Therapy shows ads.

### Which is updated more often, Parabon CTX Study App or Axes Physical Therapy?

Parabon CTX Study App ships an update every 3 weeks, and Axes Physical Therapy every 3 months. Most recently, Parabon CTX Study App was updated on October 6, 2026 and Axes Physical Therapy on September 9, 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.*