How do I install Knob?

Knob is part of Charcoal UI Pro. Add the @charcoal registry to components.json with your access token, then run npx shadcn@latest add @charcoal/knob. It copies knob.tsx into components/ui and installs motion, clsx, tailwind-merge.

Is Knob free for commercial use?

Knob needs a Charcoal UI Pro seat, monthly or a one-time lifetime price. A seat covers unlimited personal and commercial projects, including client work, and every future Pro component.

Does Knob work with Next.js?

Yes. It is a client component for React 19 styled with Tailwind CSS 4, so it works in the Next.js App Router and Pages Router, Vite, Remix and Astro.

Can an AI coding agent install Knob?

Yes. Connect the Charcoal UI MCP server (https://charcoalui.com/mcp) to Claude Code, Cursor or any MCP client; get_component returns Knob's props and get_install_command returns the exact command.

Knob

Rotary dial with an ember arc. Drag up or down, scroll, or use the arrow keys.

Category: Inputs
Licence: Charcoal UI Pro
Built with: React 19, Tailwind CSS 4, Motion
Dependencies: motion, clsx, tailwind-merge

Examples

Knob

API reference

Prop	Type	Default
`value / defaultValue`	`number`	—
`onValueChange`	`(value: number) => void`	—
`min / max / step`	`number`	`0 / 100 / 1`
`size`	`number`	`96`
`label`	`string`	—
`format`	`(value: number) => string`	—

About Knob

Knob is a rotary dial with an accent arc that fills as you turn it. Drag up or down, scroll the wheel or use the arrow keys. It is the control for audio, lighting and anything that should feel like hardware.

Knob is an input component for React 19, styled with Tailwind CSS 4 and animated with Motion. It drops into Next.js, Vite, Remix or Astro through the shadcn CLI as a single file you own.

When to use Knob

Audio apps: gain, pan, filters and effects.
Lighting and smart-home controls.
Synthesizers and creative tools.
Dashboards that want a tactile setting.

How it works

Vertical drag maps to the value so it works the same at any size, and the arc is an SVG path drawn from min to the current value. It is a slider role with full keyboard support and a formatted value for screen readers.

It is a real form control: it has an accessible name, works with the keyboard alone, shows a visible focus ring and announces its state to screen readers. With prefers-reduced-motion on, it holds still or settles instantly instead of animating.

Customizing Knob

Every prop is documented in the API reference above with its type and default. The ones you will reach for first are listed here.

The Customize panel next to the preview lets you change label, size, step live, and the Code tab updates to match, so the snippet you copy already carries your values.

value / defaultValue (number).
min / max / step (number, default 0 / 100 / 1).
size (number, default 96).
label (string).
format ((value: number) => string).

Goes well with Knob

These inputs pieces share its tokens and motion language, so they sit together on one page without clashing.

Magnetic: Make any React element lean toward the pointer and spring home: a magnetic hover in one wrapper
Color Picker: An animated React swatch colour picker with a ring that glides to the selection
Rating: An animated React star rating with hover preview and a ripple of popping stars
File Dropzone: An animated React file dropzone that lifts on hover and lists uploads with progress
Like Button: An animated React like button: the heart pops, sparks burst and the count rolls

Install Knob

npx shadcn@latest add @charcoal/knob

Knob is part of Charcoal UI Pro. One seat unlocks all 300 Pro components, 107 landing-page sections and 100 full templates, for every personal and client project, with updates included. Add the @charcoal registry once with your access token, then the command above copies knob.tsx into components/ui and installs clsx, tailwind-merge.

You own the file you install: no runtime package, no lock-in, nothing to keep in sync. Change it however your product needs.

See Charcoal UI Pro pricing · Pro setup

Frequently asked questions

How do I install Knob?: Knob is part of Charcoal UI Pro. Add the @charcoal registry to components.json with your access token, then run npx shadcn@latest add @charcoal/knob. It copies knob.tsx into components/ui and installs motion, clsx, tailwind-merge.
Is Knob free for commercial use?: Knob needs a Charcoal UI Pro seat, monthly or a one-time lifetime price. A seat covers unlimited personal and commercial projects, including client work, and every future Pro component.
Does Knob work with Next.js?: Yes. It is a client component for React 19 styled with Tailwind CSS 4, so it works in the Next.js App Router and Pages Router, Vite, Remix and Astro.
Can an AI coding agent install Knob?: Yes. Connect the Charcoal UI MCP server (https://charcoalui.com/mcp) to Claude Code, Cursor or any MCP client; get_component returns Knob's props and get_install_command returns the exact command.

Knob as Markdown · llms.txt