# Span Waterfall

> A request-trace viewer that renders spans as nested bars on one time axis, letting you collapse subtrees, follow the critical path that decided total latency, and inspect any span's attributes and self time.

- Author: [ham7a311](https://21st.dev/@ham7a311)
- Library: ham7a311
- License: MIT
- Tags: Observability, Developer Tool
- Live preview: https://21st.dev/@ham7a311/components/span-waterfall

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/ham7a311/span-waterfall?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/observability.md