How is the complementary colour calculated?

The base colour is converted to HSL and the hue is rotated 180° around the colour wheel, keeping saturation and lightness. Analogous, triadic, split-complementary and tetradic schemes rotate the hue by other standard angles.

Do my colours leave my device?

No. Every harmony is computed locally in your browser. Nothing about the colours you enter is uploaded to any server.

Are the harmony colours accurate?

Yes. The hue rotations use deterministic HSL maths and standard colour-wheel angles (180°, ±30°, 120°, etc.), so the results are reproducible and correct.

Complementary Color Finder

Find complementary, analogous, triadic and tetradic colour harmonies.

Complementary colour finder

Enter any colour and instantly find its complementary, analogous, triadic, split-complementary and tetradic harmonies — the classic schemes from the colour wheel.

Each harmony is generated by rotating the hue in HSL space while keeping saturation and lightness. Click any swatch to copy its hex. Everything runs locally in your browser — nothing is uploaded.