# Slope

> Before and after, one line per item. Sample data: store conversion by channel, September to October, email 4.1% to 5.2%.

- Type 044 · Compare items
- Component: `<Slope>`, the same name as the Figma component
- Install: `npx shadcn add @chartory/slope` (free in Hearth: the public registry, no token; Signal with Code and Complete)
- Type page: https://usechartory.com/charts/slope

## Installation

1. **Set up the registry once.** This chart is free in Hearth and MIT licensed: no token. Add @chartory to components.json once (the URL alone, no headers), or skip this when another chart is already installed. [Installation guide](https://usechartory.com/docs/installation)

2. **Add the chart.** One command adds the Slope component to your project.

```bash
npx shadcn add @chartory/slope
```

3. **Use it.** Pass your rows. The props are the Figma properties.

usage.tsx:

```tsx
import { Slope }
  from "@/components/chartory/slope"

<Slope
  data={channelConversion}
  size="m"
  legend
/>
```

## Props

### `<Slope>`

Every prop but data is a Figma property with the same name and values.

| Prop | Type | Default | Note |
| --- | --- | --- | --- |
| data | SlopeData | Required | The chart's data. The tables below list every field. |
| size | "xs" \| "s" \| "m" \| "l" | "m" | The size class. Each one is laid out again from the data. |
| legend | boolean | true | Shows the legend row under the plot. |

### SlopeData

The data prop: one object for the whole chart.

| Prop | Type | Default | Note |
| --- | --- | --- | --- |
| left | string | Required | The left side's label. |
| right | string | Required | The right side's label. |
| min | number | Required | The bottom of the value scale. |
| max | number | Required | The top of the value scale. |
| fmt | (v: number) => string | Required | Formats a value for its label. |
| rows | SlopeRow[] | Required | One entry per row. |

### SlopeRow

One object per entry in rows.

| Prop | Type | Default | Note |
| --- | --- | --- | --- |
| label | string | Required | The name shown on the chart. |
| a | number | Required | The value on the left. |
| b | number | Required | The value on the right. |

## Slope chart: a React and Figma chart in four sizes

### What does a slope chart show?

A slope chart joins each item's value at two points in time with a straight line, so risers and fallers show by the angle. Use it for before and after comparisons such as conversion by channel this month against last month.

Chartory ships it as a Figma component and a React component with the same name. The code installs from the shadcn registry with one command and lands in your project as a file you own.

### What is the Slope component?

It is one **<Slope>** component. Its props are the Figma properties with the same names and values, and the props table above lists them. The data is two values per item, at two points.

Sizes **XS**, **S**, **M** and **L** re-lay the chart out from the data instead of scaling it, so labels stay readable at every size.

### When should I use it?

- **Are there exactly two points?** Yes means the slope fits.
- **Is the change the point?** Yes means the slope fits.
- **Is it a few items?** Yes means the slope fits.

### When does another type fit better?

- **More periods to follow.** Use Bump chart instead.
- **Two values compared, not a change.** Use Dumbbell instead.
- **Many items cross into a tangle.** Use Diverging bars instead.

## Slope chart questions

### Does the Slope chart work with shadcn/ui?

Yes. It installs through the shadcn registry with the shadcn CLI, and the file lands in your project.

### How do I install it?

It is free in Hearth and MIT licensed: add the @chartory registry URL once, no token, then run npx shadcn add @chartory/slope. The Installation guide has the steps.

### Can my coding agent install it?

Yes. Connect the Chartory MCP server and ask for the slope chart; the agent runs the same command and you review the diff.

### What data does it expect?

Two values per item, at two points. The sample data comes with the component, and the props table lists every field.

### Which sizes does it ship in?

XS, S, M and L, in Figma and in code. Each size is laid out again from the data, so text and lines keep their size.

### Is it in the Figma file too?

Yes. chart/044-slope-conversion has the same properties as the component.

### Does it follow light and dark mode?

Yes. Every paint is a token, so the chart follows light and dark mode and the collection you pick.

### Which plan has the code?

None for Hearth: it is free in the public registry, no token. The Signal collection (@chartory/signal) comes with Code and Complete.