# Rethink Physical Therapy vs Submax

The clearest difference is in-app purchases: Rethink Physical Therapy at none against Submax's 1. Submax's advantage is update cadence (every 2 days vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Submax sells 1 in-app purchase, starting at $3.99 per year. Rethink Physical Therapy asks for nothing beyond the download.

Rethink Physical Therapy ships an update every 6 months, Submax every 2 days. Both last shipped on October 6, 2026.

## The numbers

| Metric | Rethink Physical Therapy | Submax |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 days** |
| Size | 43 MB | 24 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Rethink Physical Therapy, PLLC](https://appshunter.io/developer/1743825729) | [The University of Kansas](https://appshunter.io/developer/726307325) |

## What reviewers say

### Rethink Physical Therapy

[App page](https://appshunter.io/ios/app/rethink-physical-therapy/id6499549518)

**Features:** macOS Compatibility

**In-app purchases:** none


### Submax

[App page](https://appshunter.io/ios/app/submax/id6744069857)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TBRS Submax Yearly Subscription | $3.99 | per year |


## Frequently asked questions

### Is Rethink Physical Therapy free?

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

### Is Submax free?

Submax is free to download, with in-app purchases available.

### Do Rethink Physical Therapy or Submax have ads?

Neither Rethink Physical Therapy nor Submax shows ads.

### Which is updated more often, Rethink Physical Therapy or Submax?

Rethink Physical Therapy ships an update every 6 months, and Submax every 2 days. Most recently, Rethink Physical Therapy was updated on October 6, 2026 and Submax on October 6, 2026.

---

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