Controls
Square size
Checker color
Blue
Teal
Green
Purple
Orange
Magenta
Custom checker
Background color
Deep Red
Medium Red
Burgundy
Crimson
Brick
Dark Maroon
Custom background
Background brighten
Hole diameter
Animate colors
Demo (auto-rotate)
Download PNG
Reset
Tests
Run self-tests
(test output will appear here)
Drag the circle on the canvas. “Demo” will move the hole, cycle colors, and vary sizes.
Use background dropdown or custom picker, then brighten for print.