# WS4 Door Access vs Combinations & Probabilities

The clearest difference is in-app purchases: WS4 Door Access at none against Combinations & Probabilities's 1. WS4 Door Access also leads on ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. Combinations & Probabilities sells 1 one-off in-app purchase. WS4 Door Access asks for nothing beyond the download.

## The numbers

| Metric | WS4 Door Access | Combinations & Probabilities |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Weekly |
| Size | 24 MB | 33 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | +4 |
| Developer | [XPR GROUP](https://appshunter.io/developer/1524279005) | [Joao Carrion](https://appshunter.io/developer/1044104256) |

## What reviewers say

### WS4 Door Access

[App page](https://appshunter.io/ios/app/ws4-door-access/id1582598745)

**Features:** macOS Compatibility

**In-app purchases:** none


### Combinations & Probabilities

[App page](https://appshunter.io/ios/app/combinations-and-probabilities/id6758729922)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| C&P Pro | $2.99 | one-time |


## Frequently asked questions

### Is WS4 Door Access free?

WS4 Door Access is free to download, with no in-app purchases.

### Is Combinations & Probabilities free?

Combinations & Probabilities is free to download, with in-app purchases available.

### Do WS4 Door Access or Combinations & Probabilities have ads?

Combinations & Probabilities shows ads; WS4 Door Access does not.

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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.*