# Scale Theory vs Negative Harmony

The clearest difference is ads: Negative Harmony at none against Scale Theory's shown. Scale Theory's advantage is price ($1.99 vs $2.99). On in-app purchases, device support and iOS requirement there is nothing between them.

Scale Theory costs $1.99 and Negative Harmony $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Scale Theory | Negative Harmony |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Size | 19 MB | 32 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [YellowDress](https://appshunter.io/developer/509933147) | [Martin Adler](https://appshunter.io/developer/1896354791) |

## What reviewers say

### Scale Theory

[App page](https://appshunter.io/ios/app/scale-theory/id6761800685)

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

**In-app purchases:** none


### Negative Harmony

[App page](https://appshunter.io/ios/app/negative-harmony/id6781442884)

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

**In-app purchases:** none


## Frequently asked questions

### Is Scale Theory free?

Scale Theory costs $1.99, with no in-app purchases.

### Is Negative Harmony free?

Negative Harmony costs $2.99, with no in-app purchases.

### Do Scale Theory or Negative Harmony have ads?

Scale Theory shows ads; Negative Harmony 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.*