# JS Training vs Empirica Performance

The clearest difference is in-app purchases: JS Training at none against Empirica Performance's 1. Empirica Performance's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. Empirica Performance sells 1 in-app purchase, starting at $399.99 per month. JS Training asks for nothing beyond the download.

## The numbers

| Metric | JS Training | Empirica Performance |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Monthly |
| Size | 36 MB | 50 MB |
| Requires iOS | **14.1** | 15.0 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [James Seeley](https://appshunter.io/developer/1722129560) | [Alex Dawson](https://appshunter.io/developer/1772296345) |

## What reviewers say

### JS Training

[App page](https://appshunter.io/ios/app/js-training/id6474629503)

**In-app purchases:** none


### Empirica Performance

[App page](https://appshunter.io/ios/app/empirica-performance/id6736530412)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ADPT Transformation | $399.99 | per month |


## Frequently asked questions

### Is JS Training free?

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

### Is Empirica Performance free?

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

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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.*