Scratch Art
The page is coated in black; scratch with your finger or mouse to reveal colorful lines underneath. Pick from three nib sizes, and New pattern swaps the hidden layer between rainbow stripes, starry dots and soft clouds, recoloring what you have already drawn.
Built with
How it was made
Written with Claude Code as a single web page with no libraries; the black coating is its own canvas and each stroke is cut out of it with an erase blend mode, and every stroke is recorded so the drawing can be replayed exactly when the window resizes.