# Bars

> One value per item, side by side. Sample data: monthly company card spend, January to September, 71K in July, September month to date.

- Type 001 · Compare items
- Component: `<Bars>`, the same name as the Figma component
- Install: `npx shadcn add @chartory/bars` (free in Hearth: the public registry, no token; Signal with Code and Complete)
- Type page: https://usechartory.com/charts/bars

## 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 Bars component to your project.

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

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

usage.tsx:

```tsx
import { Bars }
  from "@/components/chartory/bars"

<Bars
  data={cardSpend}
  size="m"
  legend
/>
```

## Props

### `<Bars>`

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

| Prop | Type | Default | Note |
| --- | --- | --- | --- |
| data | BarsData | 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. |
| color | "cat-1" \| "cat-2" \| "cat-3" \| "cat-4" | "cat-1" | The data colour of the primary marks (data/primary). |

### BarsData

The data prop: one object for the whole chart.

| Prop | Type | Default | Note |
| --- | --- | --- | --- |
| cats | string[] | Required | The category labels, in order. |
| vals | number[] | Required | The values, in order. |
| toks | string[] | Required | The colour token of each item, in order. |
| max | number | Required | The top of the value scale. |
| shape | "pill" \| "top" | Required | The bar ends. |
| inside | "rot" \| "flat" | Required | How the value labels sit in the bars. |
| ratio? | number | 0.25 | The gap between bars, as a share of the band. |
| fmt | (v: number) => string | Required | Formats a value for its label. |
| ref? | BarsRef | — | A reference line: value, label and colour. |

### BarsRef

The ref object.

| Prop | Type | Default | Note |
| --- | --- | --- | --- |
| v | number | Required | The value. |
| label | string | Required | The name shown on the chart. |
| tok | string | Required | The colour token, e.g. "data/primary". |

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

### What does a bar chart show?

A bar chart gives each item or period one bar from zero, so the tallest and shortest stand out at once. It is the safest way to compare amounts. Use it for monthly totals, counts per category and any values people want to rank by eye.

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 Bars component?

It is one **<Bars>** component. Its props are the Figma properties with the same names and values, and the props table above lists them. The data is one value per item or period.

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?

- **Is each bar its own amount?** Yes means the bars fit.
- **Is there one series?** Yes means the bars fit.
- **Are the labels short?** Yes means the bars fit.

### When does another type fit better?

- **The parts make up one whole.** Use Stacked bars instead.
- **Several series per period.** Use Grouped bars instead.
- **Long names need room.** Use Horizontal bars instead.

## Bar chart questions

### Does the Bars 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/bars. The Installation guide has the steps.

### Can my coding agent install it?

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

### What data does it expect?

One value per item or period. 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/001-bars 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.