How do I install Spring Line?

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

Is Spring Line free for commercial use?

Spring Line 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 Spring Line 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 Spring Line?

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

Spring Line

An elastic string you can pluck: grab anywhere along it, pull against growing resistance, and let go to watch it twang back and settle.

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

Examples

Spring Line

API reference

Prop	Type	Default	Description
`width`	`number`	`360`
`stiffness`	`number`	`260`
`damping`	`number`	`6`	Lower bounces longer.
`color`	`string`	—
`className`	`string`	—

About Spring Line

Spring Line is a string you can pluck: grab anywhere along it, pull against growing resistance, and let go to watch it twang back and settle. It is a small toy that makes a page feel touchable.

Spring Line is an interactive effect 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 Spring Line

About and portfolio pages.
Section dividers with play.
Physics and education demos.
Easter eggs.

How it works

The line is a curve drawn through the grab point, so the knob always sits on it. Release runs a spring you can tune, and the pull follows a curve that resists more the further you go.

Pointer effects have a keyboard or static equivalent, and nothing that matters depends on hover alone. With prefers-reduced-motion on, it holds still or settles instantly instead of animating.

Customizing Spring Line

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 stiffness, damping live, and the Code tab updates to match, so the snippet you copy already carries your values.

width (number, default 360).
stiffness (number, default 260).
damping (number, default 6): Lower bounces longer.
color (string).

Goes well with Spring Line

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

Hover Reveal List: A React hover reveal list: hovering a row floats its image beside the pointer
Pixel Grid: A React pixel grid: cells light up under the pointer and fade slowly
Draggable Cards: React draggable cards: polaroids scattered on a table you can pick up
Image Accordion: A React image accordion: the hovered panel expands to reveal its caption
Velocity Marquee: A React velocity marquee: big text that speeds up and flips with scroll

Install Spring Line

npx shadcn@latest add @charcoal/spring-line

Spring Line is part of Charcoal UI Pro. One seat unlocks all 393 Pro components, 112 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 spring-line.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 Spring Line?: Spring Line is part of Charcoal UI Pro. Add the @charcoal registry to components.json with your access token, then run npx shadcn@latest add @charcoal/spring-line. It copies spring-line.tsx into components/ui and installs motion, clsx, tailwind-merge.
Is Spring Line free for commercial use?: Spring Line 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 Spring Line 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 Spring Line?: Yes. Connect the Charcoal UI MCP server (https://charcoalui.com/mcp) to Claude Code, Cursor or any MCP client; get_component returns Spring Line's props and get_install_command returns the exact command.

Spring Line as Markdown · llms.txt