Threads
Fine threads stretched across the frame, pinched together at both ends, that ripple on their own and bow toward the pointer as it passes. WebGL, written in the file.
- Category: Backgrounds
- Licence: Charcoal UI Pro
- Built with: React 19, Tailwind CSS 4, Motion
- Dependencies: motion, clsx, tailwind-merge
Examples
Threads
API reference
| Prop | Type | Default | Description |
|---|---|---|---|
speed | number | 1 | 0 holds still. |
color | string | "var(--foreground)" | |
lines | number | 28 | |
amplitude | number | 1 | |
spread | number | 1 | |
className | string | — |
About Threads
Threads stretches fine lines across the frame, pinched together at both ends, that ripple on their own and bow toward the pointer as it passes. Quiet enough for a product page, alive enough to notice.
Threads is an animated background 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 Threads
- Minimal SaaS heroes.
- Developer tool landing pages.
- Section dividers with depth.
- Backgrounds behind large type.
How it works
Each thread is a smooth noise curve with an envelope that pins the ends, plus a pull toward the smoothed pointer. The shader is written in the file, with no three.js or other dependency. It pauses when scrolled out of view, caps the pixel ratio at 2, re-reads your theme colours when the theme changes, and falls back to a soft gradient where WebGL is missing.
The whole layer is decorative and aria-hidden, sits behind your content without taking pointer events it does not need, and pauses when scrolled off screen. With prefers-reduced-motion on, it holds still or settles instantly instead of animating.
Customizing Threads
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 speed, lines, amplitude, spread, color live, and the Code tab updates to match, so the snippet you copy already carries your values.
- speed (number, default 1): 0 holds still.
- color (string, default "var(--foreground)").
- lines (number, default 28).
- amplitude (number, default 1).
- spread (number, default 1).
Goes well with Threads
These backgrounds pieces share its tokens and motion language, so they sit together on one page without clashing.
- Ember Field: An animated React ember background: glowing embers drift up and flicker as they cool
- Smoke: A slow React smoke background: blurred plumes drifting over dark sections, CSS only
- Aurora: An animated React aurora background: soft light bands drifting across a section
- Grid Beams: A React grid background with beams of light running along its lines
- Meteors: A React meteor shower background: streaks falling diagonally, CSS only
Install Threads
npx shadcn@latest add @charcoal/threadsThreads 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 threads.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 Threads?
- Threads is part of Charcoal UI Pro. Add the @charcoal registry to components.json with your access token, then run npx shadcn@latest add @charcoal/threads. It copies threads.tsx into components/ui and installs motion, clsx, tailwind-merge.
- Is Threads free for commercial use?
- Threads 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 Threads 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 Threads?
- Yes. Connect the Charcoal UI MCP server (https://charcoalui.com/mcp) to Claude Code, Cursor or any MCP client; get_component returns Threads's props and get_install_command returns the exact command.