# What If vs Kayf

The clearest difference is in-app purchases: What If at none against Kayf's 1. What If also leads on iOS requirement (16.4 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Kayf sells 1 one-off in-app purchase. What If asks for nothing beyond the download.

## The numbers

| Metric | What If | Kayf |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | — | Every 5 days |
| Size | 58 MB | 25 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sharebird, Inc.](https://appshunter.io/developer/1896764339) | [Tariq Al-aqrabawi](https://appshunter.io/developer/1877383192) |

## What reviewers say

### What If

[App page](https://appshunter.io/ios/app/what-if-science-puzzles/id6805311897)

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

**In-app purchases:** none


### Kayf

[App page](https://appshunter.io/ios/app/kayf-how-things-work/id6813402468)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kayf Pro | $4.99 | one-time |


## Frequently asked questions

### Is What If free?

What If is free to download, with no in-app purchases.

### Is Kayf free?

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

### Do What If or Kayf have ads?

Both What If and Kayf show ads.

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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.*