# Letter Glitch · Pro

A field of monospace glyphs that flicker and change colour at random, a few cells every frame, with vignettes so copy can sit over it.

This is a Charcoal UI Pro component. Its source and examples are available with a Pro seat: https://charcoalui.com/pricing

## With a Pro seat

1. Add the registry to components.json:

```json
{
  "registries": {
    "@charcoal": {
      "url": "https://charcoalui.com/r/{name}.json",
      "headers": {
        "Authorization": "Bearer ${CHARCOAL_LICENSE_KEY}"
      }
    }
  }
}
```

2. Copy your licence key from https://charcoalui.com/dashboard and put it in .env.local as CHARCOAL_LICENSE_KEY, then:

```bash
npx shadcn@latest add @charcoal/letter-glitch
```

To read Pro source through this MCP server, reconnect it with the header "Authorization: Bearer <licence key>".

## API — Letter Glitch
| Prop | Type | Default | Notes |
| --- | --- | --- | --- |
| `speed` | `number` | `50` | Glyph changes per second. |
| `colors` | `string[]` | `["var(--muted-foreground)", "var(--ember)", "var(--foreground)"]` |  |
| `centerVignette` | `boolean` | `false` |  |
| `outerVignette` | `boolean` | `true` |  |
| `smooth` | `boolean` | `true` | Ease colour changes. |
| `cell` | `number` | `16` |  |
| `className` | `string` | — |  |

See it live: https://charcoalui.com/docs/components/letter-glitch