palette

a very fast way to extract & save colour palettes from images.

simply paste/upload an image, then quick-copy hex values, save collections and export to:

• .ase (Adobe Swatch Exchange): imports into Photoshop / Illustrator / InDesign as a named swatch library
• .aco (Photoshop Color Swatches) loads into the Swatches panel
• CSS custom properties
• JSON file
• GIMP .gpl
• plaintext #HEX list

Colour quantisation (median-cut + perceptual merge) runs in a web worker on a 256px downscale of the image, so extraction is ~tens of milliseconds and never blocks the UI. The worker is pre-warmed on load. The full-resolution image is kept only for pixel-accurate eyedropping.

Quick start

Requires Docker (for Postgres) and Node 20+.

./dev start      # Postgres in Docker + backend + frontend, installs deps on first run

Open http://localhost:5180.

./dev stop       # stop everything
./dev restart    # stop then start
./dev status     # what's running
./dev logs       # tail backend + frontend logs

Keyboard shortcuts

Key	Action
⌘V	Paste image from clipboard
I	Eyedropper mode
C	Crop mode
G	Toggle Collections
⌘S	Save palette
Esc	Clear crop / close panels

Ports

Service	URL
Frontend (Vite)	http://localhost:5180
Backend (Fastify)	http://localhost:3031
Postgres	localhost:5544

See CLAUDE.md for architecture and contributor/agent notes.