# Signal Waveform

> A draggable canvas waveform scrubber that animates a sine-based signal line and lets users scrub its phase by dragging or using a slider.

- Author: [0xuser64bit](https://21st.dev/@0xuser64bit)
- Library: 0xuser64bit
- License: MIT
- Tags: Canvas, Waveform, Slider, Drag
- Live preview: https://21st.dev/@0xuser64bit/components/signal

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/0xuser64bit/signal?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/canvas.md