# Huygens3D vs Dirac equation

The clearest difference is price: Dirac equation at Free against Huygens3D's $3.99. Dirac equation also leads on ads (none vs shown) and iOS requirement (17 vs 26.0). On in-app purchases and device support there is nothing between them.

Dirac equation is free to download; Huygens3D costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Huygens3D | Dirac equation |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 25 months | — |
| Size | 147 MB | 5 MB |
| Requires iOS | 26.0 | **17** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Roland Wejner](https://appshunter.io/developer/601946624) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### Huygens3D

[App page](https://appshunter.io/ios/app/huygens3d/id6479824105)

**Features:** Vision Pro support

**In-app purchases:** none


### Dirac equation

[App page](https://appshunter.io/ios/app/dirac-equation/id6739155551)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Huygens3D free?

Huygens3D costs $3.99, with no in-app purchases.

### Is Dirac equation free?

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

### Do Huygens3D or Dirac equation have ads?

Huygens3D shows ads; Dirac equation 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.*