Color reference

#0000EE color reference

Vivid Mid-light Blue

This is a vivid, mid-light blue under the deterministic OKLCH hue, lightness, and chroma ranges. Its closest standardized CSS named color is Blue (#0000FF), measured with straight-line OKLab distance.

Descriptive label
Vivid Mid-light Blue
Recommended text
White · 9.4:1
Relative luminance
0.061730
Build a palette from #0000EE in Palette Generator Convert #0000EE in Color Converter
Formats UI preview Contrast 50–900 scale Harmonies Matches Related colors Color vision Exports

Copyable values

#0000EE in common color formats

Values are calculated from the same opaque sRGB color. Display rounding does not alter the internal calculations.

Color conversions for #0000EE
Format Value Action
HEX #0000EE
RGB rgb(0 0 238)
HSL hsl(240 100% 46.67%)
HSV hsv(240 100% 93.33%)
HWB hwb(240 0% 6.67%)
XYZ D65 color(xyz-d65 0.15431 0.061724 0.812698)
LAB lab(27.2498% 64.8129 -106.3296)
LCH lch(27.2498% 124.5258 301.3643)
OKLAB oklab(42.9015% -0.030806 -0.295677)
OKLCH oklch(42.9015% 0.297278 264.052)

Real-world test

Try #0000EE on interface components

Preview the source as a primary action, subtle status, form treatment, and card surface. Persistent state controls help touch and keyboard users inspect the same normal, hover, and active colors.

Normal state uses #0000EE with white text at 9.4:1.

Action

Primary button

Use the controls above or point to and press the button to inspect its visual states.

Status

Subtle alert badge

A 12% source tint over white provides the background; readable text is selected separately.

Ready for review

Form

Border and focus ring

Source ring on white: 9.4:1 · meets the 3:1 non-text threshold where applicable.

Surface

Card component

The selected state becomes the card surface with its strongest black-or-white text pairing.

Design system Color decision ready Review states and surrounding surfaces before shipping.

Accessibility diagnostics

WCAG contrast for exact color pairs

Each result applies only to the named foreground, background, text size, and requirement. It is not a complete accessibility or component-conformance claim.

Source #0000EE Exact pair assessment Results for source text on white appear below.

On white

9.4:1

  • Pass AA normal text · 4.5:1
  • Pass AAA normal text · 7:1
  • Pass AA large text · 3:1
  • Pass UI/non-text where applicable · 3:1
Source #0000EE Exact pair assessment Results for source text on black appear below.

On black

2.23:1

  • Fail AA normal text · 4.5:1
  • Fail AAA normal text · 7:1
  • Fail AA large text · 3:1
  • Fail UI/non-text where applicable · 3:1

Use guidance

What this color may be suitable for

Pass in a tested context

Normal-sized text

#0000EE reaches 8.99:1 on Hue Codex paper, meeting WCAG AA for normal text in that exact pairing.

Potential fit

Controls and interface graphics

Against Hue Codex paper, the color reaches 8.99:1. That meets the 3:1 color-contrast threshold where WCAG 1.4.11 applies, but states, shape, and non-color cues still need review.

Readable pairing available

Colored surface or button fill

White text provides the stronger black/white pairing on #0000EE at 9.4:1. This validates only that text pair, not hover, focus, disabled, or adjacent-color states.

Distinctive accent

Palette role

Its OKLCH chroma of 0.2973 gives it enough visual presence for an accent or primary role when the tested foreground and neighboring colors pass.

Pair available

Color used as foreground

The stronger black/white background is white at 9.4:1. Always retest against the actual rendered background and text size.

Tested backgrounds

Foreground pairing comparison

#0000EE foreground contrast on tested backgrounds
Pair Background Contrast ratio
White#FFFFFF 9.4:1
Hue Codex paper#FBFAF5 8.99:1
Soft neutral#F2EFE6 8.17:1
Black#000000 2.23:1
Hue Codex ink#10212B 1.75:1
Check #0000EE on another background in Contrast Checker

Design-system starting point

A perceptual 50–900 reference scale

The source color is preserved at the nearest lightness step. Other swatches keep its OKLCH hue, moderate chroma toward the extremes, and reduce chroma only when needed to remain in sRGB.

50
100 #CEDEFF
200
300
400
500
600
700 #0000EE Source
800
900

This is a Hue Codex reference scale, not a claim that the values match Tailwind, Material, or another framework’s named palette.

Adjust the #0000EE scale in Tints, Shades & Tones

Color relationships

Complementary, analogous, and triadic colors

Hue rotations use OKLCH while preserving lightness and requested chroma. When a rotated result falls outside sRGB, chroma is reduced deterministically and disclosed.

Complementary

Source #0000EE
Complement Chroma fitted to sRGB

Analogous

Source #0000EE
Analogous −30° Chroma fitted to sRGB
Analogous +30° Chroma fitted to sRGB

Triadic

Source #0000EE
Triad +120° Chroma fitted to sRGB
Triad +240° Chroma fitted to sRGB

Applied pairing

A small interface check

The source anchors the main action while the complement marks a secondary status. Contrast is selected separately for each fill.

Project color Vivid Mid-light Blue
Complement
Explore #0000EE in Color Harmonies

Distance matching

Closest standardized and framework colors

Matches use straight-line OKLab distance ×100. A smaller value means the coordinates are closer in this model; it is not a claim that two tokens are interchangeable in a design system.

CSS named color

Blue

#0000FF

OKLab distance ×100: 2.8

Tailwind v4 default

blue-700

oklch(48.8% 0.243 264.376)

OKLab distance ×100: 8.02 · sRGB preview #1447E6

Print boundary

Pantone match not estimated

Reliable print matching needs licensed reference data plus a defined ink, paper, profile, and viewing condition.

Read the print methodology

Color-vision screening

Approximate color-vision-deficiency views

These encoded-sRGB matrix previews are screening approximations. They help reveal possible color-only distinctions but do not reproduce every person’s vision or establish accessibility conformance.

Original#0000EE
Approx.

Protanopia

Red-vision deficiency approximation

Original#0000EE
Approx.

Deuteranopia

Green-vision deficiency approximation

Original#0000EE
Approx.

Tritanopia

Blue-yellow deficiency approximation

Original#0000EE
Approx.

Achromatopsia

Monochromatic-vision approximation

Test #0000EE with a complete palette in the CVD Simulator

Ready to use

Copy framework-ready color tokens

Exports preserve the source, readable foreground, and generated 50–900 scale. Tailwind v4 CSS-first and Tailwind v3 JavaScript-config formats are labeled separately.

CSS custom properties

Semantic aliases and the complete 50–900 scale.

:root {
  --color-primary: #0000EE;
  --color-on-primary: #FFFFFF;
  --color-primary-oklch: oklch(42.9015% 0.297278 264.052);
  --color-primary-50: #F0F5FF;
  --color-primary-100: #CEDEFF;
  --color-primary-200: #A7C4FF;
  --color-primary-300: #80A9FF;
  --color-primary-400: #588CFF;
  --color-primary-500: #306BFF;
  --color-primary-600: #043FFF;
  --color-primary-700: #0000EE;
  --color-primary-800: #001E9C;
  --color-primary-900: #00116C;
}

Tailwind v4 CSS-first theme

Current @theme syntax for bg-brand, text-brand, and scale utilities.

@import "tailwindcss";

@theme {
  --color-brand: #0000EE;
  --color-brand-foreground: #FFFFFF;
  --color-brand-50: #F0F5FF;
  --color-brand-100: #CEDEFF;
  --color-brand-200: #A7C4FF;
  --color-brand-300: #80A9FF;
  --color-brand-400: #588CFF;
  --color-brand-500: #306BFF;
  --color-brand-600: #043FFF;
  --color-brand-700: #0000EE;
  --color-brand-800: #001E9C;
  --color-brand-900: #00116C;
}

Tailwind v3 / legacy config

CommonJS theme.extend.colors for JavaScript-config projects.

module.exports = {
  theme: {
    extend: {
      colors: {
        brand: {
          '50': '#F0F5FF',
          '100': '#CEDEFF',
          '200': '#A7C4FF',
          '300': '#80A9FF',
          '400': '#588CFF',
          '500': '#306BFF',
          '600': '#043FFF',
          '700': '#0000EE',
          '800': '#001E9C',
          '900': '#00116C',
          DEFAULT: '#0000EE',
          foreground: '#FFFFFF',
        },
      },
    },
  },
};

Sass variables

Semantic source, foreground, OKLCH, and scale variables.

$color-primary: #0000EE;
$color-on-primary: #FFFFFF;
$color-primary-oklch: oklch(42.9015% 0.297278 264.052);
$color-primary-50: #F0F5FF;
$color-primary-100: #CEDEFF;
$color-primary-200: #A7C4FF;
$color-primary-300: #80A9FF;
$color-primary-400: #588CFF;
$color-primary-500: #306BFF;
$color-primary-600: #043FFF;
$color-primary-700: #0000EE;
$color-primary-800: #001E9C;
$color-primary-900: #00116C;

Modern color-mix()

Static fallbacks followed by OKLab tint and shade declarations.

:root {
  --color-primary: #0000EE;
  --color-primary-tint: #A7C4FF;
  --color-primary-tint: color-mix(in oklab, var(--color-primary) 72%, white);
  --color-primary-shade: #0000EE;
  --color-primary-shade: color-mix(in oklab, var(--color-primary) 82%, black);
}

JSON design data

Source formats, readable text, and the generated scale.

{
    "name": "Vivid Mid-light Blue",
    "hex": "#0000EE",
    "rgb": "rgb(0 0 238)",
    "oklch": "oklch(42.9015% 0.297278 264.052)",
    "recommendedText": "#FFFFFF",
    "scale": {
        "50": "#F0F5FF",
        "100": "#CEDEFF",
        "200": "#A7C4FF",
        "300": "#80A9FF",
        "400": "#588CFF",
        "500": "#306BFF",
        "600": "#043FFF",
        "700": "#0000EE",
        "800": "#001E9C",
        "900": "#00116C"
    }
}

Continue the decision

Use #0000EE in a complete workflow

Reference values are a starting point. Test the color in its real role, background, states, typography, and surrounding palette before shipping.

Adjust #0000EE in Color PickerStart with this exact color and white as the working background for role and accessibility decisions. Build a palette from #0000EE in Palette GeneratorUse this exact HEX as the seed for a deterministic, role-based palette. Check #0000EE on white in Contrast CheckerStart with this color as the foreground and white as the background, then test the real pair.