Colourco.de

Online designer tool, which allows you to easily and intuitively combine colours.

Pick colours based on HSL. Scheme-mode with monochromatic, analogic, complement, triad and quad colours.

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Esoteric Color Palette Generation Library
Make your designs alive. Shadergradient is a new tool to create beautiful, moving gradients
Accessible color combinations
OKLCH is a new way to encode colors (like hex, RGBA, or HSL)
Visualize your color palettes on a real website for the first time.
Create translucent versions of your colors. Alphredo generates translucent (alpha) colors looking the same as their opaque counterparts when placed against the same background.
An interactive guide to color & contrast.
A database of color & images for artists, designers, photographers, printers or curious people and my personal perception of color