# Colorbar

> A small gradient legend bar (vertical or horizontal) with min/max labels, used next to a heatmap or PSF/wavefront plot to show what a color scale means.

- Author: [eleoptics](https://21st.dev/@eleoptics)
- Library: ELEOptics
- License: MIT
- Tags: Legend, Heatmap, Gradient, Data Visualization
- Live preview: https://21st.dev/@eleoptics/components/colorbar

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/eleoptics/colorbar?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/legend.md