CSS named color

Blue #0000FF

Blue is vivid blue. Below: every color format, WCAG contrast against black and white, its tints, shades and tones, and the harmonies that pair with it.

Color values

Contrast & accessibility

WCAG contrast ratio of Blue used as a foreground on white and black backgrounds.

Aa The quick brown fox
8.59:1

On white

AA ✓ AAA ✓ AA Large ✓
Aa The quick brown fox
2.44:1

On black

AA ✕ AAA ✕ AA Large ✕

Tints, shades & tones

Systematic variations of Blue — click any swatch to copy its hex.

Tintsmixed toward white
Shadesmixed toward black
Tonesmixed toward gray

Color harmonies

Palettes built from Blue by rotating its hue. Each swatch links to its closest named color.

Complementary

#0000FF ≈ Medium Blue #FFFF00 ≈ Gold

Analogous

#0080FF ≈ Dodger Blue #0000FF ≈ Medium Blue #8000FF ≈ Dark Violet

Triadic

#0000FF ≈ Medium Blue #FF0000 ≈ Crimson #00FF00 ≈ Lime Green

Split-complementary

#0000FF ≈ Medium Blue #FF8000 ≈ Dark Orange #80FF00 ≈ Chartreuse

Tetradic

#0000FF ≈ Medium Blue #FF0080 ≈ Deep Pink #FFFF00 ≈ Gold #00FF80 ≈ Spring Green

Use Blue in your stack

Tailwind (arbitrary value)

Works for any property: text-[#0000ff], border-[#0000ff].

CSS custom property

Reference it anywhere with var(--color).

Build a full theme

Turn Blue into a complete shadcn/ui palette — light & dark, contrast-checked, one-command install.

Extract a theme →

Similar named colors

Medium Blue #0000CD Dark Blue #00008B Navy #000080 Blue Violet #8A2BE2 Dark Violet #9400D3 Royal Blue #4169E1

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