# Heat Calendar

> A GitHub-style activity calendar that visualizes weekly intensity values as a single-hue grid, with a legend, hover/click tooltips, and range selection with totals.

- Author: [Saurabh](https://21st.dev/@starc007)
- Library: Be UI
- License: MIT
- Tags: Calendar, Heatmap, Contribution Graph, Chart
- Live preview: https://21st.dev/@starc007/components/heat-calendar

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/starc007/heat-calendar?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/calendar.md