# Histogram Chart

> Distribution histogram with a brush: drag across the bins, or use Shift and the arrow keys, to select a range and read its count and share live in the header. Hover any bin for its exact bucket, and percentile markers (p50, p95, p99) are labelled in place on two rows so they never collide.

- Slug: `histogram-chart`
- Category: [Charts](https://www.assembli.design/category/charts.md)
- Type: component
- Tags: histogram, distribution, brush, percentile, latency, svg
- npm dependencies: motion
- shadcn/ui dependencies: none
- Added: 2026-10-21
- Live preview: https://www.assembli.design/preview/histogram-chart
- Page: https://www.assembli.design/components/histogram-chart

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/histogram-chart/histogram-chart.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/histogram-chart
```

Registry item JSON: https://www.assembli.design/r/histogram-chart.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.