Harlequin

Green is restful and reassuring. It is strongly tied to health, growth and money, and because the eye processes green easily it can reduce visual fatigue and promote a sense of balance.

Green is everywhere in health, wellness, finance, environmental and organic brands. It works for success states and confirmations in UI, and its many shades range from fresh spring accents to deep, premium forest tones.

Greens were historically difficult to produce; early pigments like verdigris and malachite were unstable or toxic. A breakthrough came with Scheele’s green and later chrome green in the 18th and 19th centuries, which popularized the color despite some toxicity concerns.

Green symbolizes nature, renewal, safety and prosperity across most cultures. It also means “go” in signaling and is the color of many environmental and religious movements.

Choose green for brands that want to feel natural, healthy, trustworthy or financially sound. It is a versatile hue that works equally well as a calm background or a vibrant accent.

Against white, #3FFF00 has a 1.4:1 contrast ratio; against black it is 15.5:1. Black text on #3FFF00 meets WCAG AA for normal text.

Roughly 180° across the wheel from #3FFF00 (hue 105°) sits #bf00ff, held together by the #a3f986 tint and the neutrals #f4f4f5 and #18181b.

#3FFF00 with its two closest neighbours, #bfff00 and #00ff40, for a 100%-saturation run that stays inside one family; #a3f986 and #208000 add depth without breaking it.

#3FFF00 plus #0040ff and #ff0040, a triangle that sits 120° apart at every corner, with #f4f4f5 and #18181b doing the quiet work underneath.

One hue at 5 lightness steps: #f0ffeb through #081f00, starting from #3FFF00 at 50% lightness.