# Performance Dynamics vs Underdog Boxing Gym

The clearest difference is update cadence: Performance Dynamics at every 9 months against Underdog Boxing Gym's every 32 months. Underdog Boxing Gym's advantage is device support. On price, in-app purchases and iOS requirement there is nothing between them.

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

Performance Dynamics ships an update every 9 months, Underdog Boxing Gym every 32 months. The most recent releases landed on October 9, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Performance Dynamics | Underdog Boxing Gym |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | **Every 9 months** | Every 32 months |
| Size | 55 MB | 87 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TeamUp Sports](https://appshunter.io/developer/1449504626) | [Treshna Enterprises](https://appshunter.io/developer/959435261) |

## What reviewers say

### Performance Dynamics

[App page](https://appshunter.io/ios/app/performance-dynamics/id6447365555)

**In-app purchases:** none


### Underdog Boxing Gym

[App page](https://appshunter.io/ios/app/underdog-boxing-gym/id6468970821)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Performance Dynamics free?

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

### Is Underdog Boxing Gym free?

Underdog Boxing Gym is free to download, with no in-app purchases.

### Which is updated more often, Performance Dynamics or Underdog Boxing Gym?

Performance Dynamics ships an update every 9 months, and Underdog Boxing Gym every 32 months. Most recently, Performance Dynamics was updated on October 9, 2026 and Underdog Boxing Gym on October 6, 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.*