Shades and tints, ready as CSS variables
Pick a base colour and this tool builds a row of tints (mixed toward white)
and shades (mixed toward black) around it, then emits a clean :root block
of CSS custom properties you can paste straight into your stylesheet.
Choose how many steps you want on each side, copy the variables, and you have a consistent light-to-dark ramp for buttons, hovers, borders and backgrounds — all generated in your browser with nothing uploaded.