# contrastRatio

Canonical: https://docs.shumoku.dev/en/library/api/contrastRatio
Language: en

@shumoku/core · 0.5.0 · function

# contrastRatio

[Source](https://github.com/konoe-akitoshi/shumoku/blob/main/libs/@shumoku/core/src/libs/@shumoku/core/src/themes/tone.ts#L105)

The WCAG contrast ratio of two colours.

```
contrastRatio(a: string, b: string): number
```

## Parameters

| Parameter | Type | Description | Default |
| --- | --- | --- | --- |
| `a` | `string` | No additional description. | `—` |
| `b` | `string` | No additional description. | `—` |

## Returns

```
number
```

[`libs/@shumoku/core/src/libs/@shumoku/core/src/themes/tone.ts:105`](https://github.com/konoe-akitoshi/shumoku/blob/main/libs/@shumoku/core/src/libs/@shumoku/core/src/themes/tone.ts#L105)