# vDiffraction vs NumAndShape

The clearest difference is in-app purchases: vDiffraction at none against NumAndShape's 6. vDiffraction also leads on ads (none vs shown) and iOS requirement (8.0 vs 16.6). On price and device support there is nothing between them.

Both are free to download. NumAndShape sells 6 one-off in-app purchases. vDiffraction asks for nothing beyond the download.

## The numbers

| Metric | vDiffraction | NumAndShape |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 2 months |
| Size | 32 MB | 5 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Institut Laue-Langevin](https://appshunter.io/developer/649939789) | [ken morobayashi](https://appshunter.io/developer/954811891) |

## What reviewers say

### vDiffraction

[App page](https://appshunter.io/ios/app/vdiffraction/id1343287476)

**Features:** macOS Compatibility

**In-app purchases:** none


### NumAndShape

[App page](https://appshunter.io/ios/app/numandshape/id6468994873)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| prime number | $0.49 | one-time |
| power | $0.49 | one-time |
| per hour | $0.49 | one-time |
| binary number | $0.49 | one-time |
| sin cos tan | $0.49 | one-time |
| NumAndShape Unlimited | $1.99 | one-time |


## Frequently asked questions

### Is vDiffraction free?

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

### Is NumAndShape free?

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

### Do vDiffraction or NumAndShape have ads?

NumAndShape shows ads; vDiffraction 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.*