Is Blue (#0000FF) accessible for digital body text?

Against a pure white background (#FFFFFF), #0000FF achieves a contrast ratio of 8.59:1 (Passing WCAG AA normal text). Against a dark slate background (#0F172A), it achieves a contrast ratio of 2.08:1 (Failing WCAG AA normal text).

Which color harmonies pair best with Blue?

The exact complementary color for #0000FF is #FFFF00. For analogous pairings, use #007FFF and #7F00FF. You can explore these combinations further in our Color Harmony Generator.

Color Directory/Blue

Blue (#0000FF)

Q: What are the exact digital and print color codes for Blue (#0000FF)?

Blue has the HEX code #0000FF. In RGB color coordinates, its values are 0, 0, 255. In HSL, it is 240°, 100%, 50%. In CMYK print values, it corresponds to C:100% M:100% Y:0% K:0%.

Luminance: 7% · Nearest standard name: Blue

Generate Around This Color

BLUE

#0000FF

rgb(0, 0, 255) · hsl(240°, 100%, 50%)

HEX#0000FF

RGB0, 0, 255

HSL240°, 100%, 50%

HSV / HSB240°, 100%, 100%

CMYK (Print)100%, 100%, 0%, 0%

Color Harmonies

Complementary

#0000FF#FFFF00

Analogous

#007FFF#0000FF#7F00FF

Triadic

#0000FF#FF0000#00FF00

Tints & Shades

Lighter Tints

Darker Shades

WCAG 2.2 Contrast Verification

Against White (#FFFFFF)8.59:1

Sample text rendered with #0000FF on white

AA Normal: PASSAA Large: PASS

Against Dark (#0F172A)2.08:1

Sample text rendered with #0000FF on dark

AA Normal: FAILAA Large: FAIL

Palettes Featuring Similar Tones

cp-featured-01Technology

TechModernCool

cp-featured-02Sunset

SunsetGradientCreative

cp-featured-03Vintage

VintageRetroWarm

cp-featured-04Gaming

Cyber Glitch Protocol

GamingFuturisticNeon

Comprehensive Color Profile & Design Architecture

The Complete Color Guide to Blue (#0000FF)

Blue (#0000FF) is a distinct shade within the Blue chromatic spectrum. Characterized by an optical luminance of 7% and a cool color temperature, this tone plays a vital role across web applications, brand identities, and editorial typography. Discover its mathematical harmonies, accessibility metrics, UI engineering roles, and front-end code tokens.

Technical Colorimetry & Coordinate Breakdown

Exact mathematical values across digital display, print press, and human perceptual spaces.

HEX Code#0000FF

RGB Space0, 0, 255

HSL Values240°, 100%, 50%

HSV / HSB240°, 100%, 100%

CMYK Ink100%, 100%, 0%, 0%

TemperatureCool

Optical Color Harmony Formulas for Blue

Geometric intervals calculated from #0000FF on the 360-degree color wheel.

Direct Polar (180°)#FFFF00

Complementary Harmony

Pairs Blue with its polar opposite (#FFFF00) to create maximum optical contrast, perfect for high-converting call-to-action buttons.

Adjacent (±30°)#007FFF · #7F00FF

Analogous Harmony

Positions adjacent neighboring hues on either side of Blue for serene, gentle, and organic visual transitions.

Split Angles (150° / 210°)#FF8000 · #80FF00

Split-Complementary

Uses the two colors flanking the direct complement of Blue, offering rich visual variety without harsh chromatic vibration.

Triangular (120°)#FF0000 · #00FF00

Triadic Harmony

Forms an equilateral triangle on the color wheel, generating playful, dynamic energy when balanced against a neutral background.

Rectangular (90°)#FF0080 · #FFFF00 · #00FF80

Tetradic (Square) Harmony

A rich four-color scheme combining two complementary pairs, ideal for complex dashboards, gaming HUDs, and multi-tier charts.

Interactive Exploration

Build Palettes With Blue

Lock #0000FF inside our interactive generator to calculate live matching palettes in real time.

Launch Palette Generator

The 60-30-10 UI Implementation Role for Blue

Recommended proportional volume and semantic interface assignment.

Recommended Assignment: Interactive Brand Accent (10% Volume)

With a saturation of 100% and lightness of 50%, Blue (#0000FF) acts as an attention-grabbing focal point. In user interfaces, reserve it for primary CTA buttons, active state indicators, and notification badges to draw user clicks immediately.

Light Mode SurfaceIdeal for buttons and badges

Dark Mode AdaptationDesaturate slightly for ambient glow

Tonal Expansion ScaleView 10-step design token ramp →

Color Psychology & Industry Alignment

Strategic cognitive triggers and target sector recommendations.

Cognitive & Emotional Perception

This color projects authority, intelligence, and calm dependability. Universally trusted across enterprise software and fintech products.

Optimal Industry Verticals

Fintech, Enterprise SaaS, Healthcare, Cloud Infrastructure. Combining Blue with intentional neutral whitespace reinforces authority and conversion clarity.

Production Code Tokens for Blue

Drop-in design system tokens for CSS, Tailwind CSS, and SCSS.

CSS Custom Properties (:root)Vanilla CSS

:root {
  --color-0000ff: #0000FF;
  --color-0000ff-rgb: 0, 0, 255;
  --color-0000ff-hsl: 240deg 100% 50%;
}

tailwind.config.jsTailwind CSS

module.exports = {
  theme: {
    extend: {
      colors: {
        '0000ff': '#0000FF',
      }
    }
  }
};

Explore Related Color Tools for Blue

Continue developing your color system with specialized design tools.

Palette Generator

Generate harmonious 5-color palettes anchored to Blue.

Launch Tool

WCAG Contrast Checker

Verify Level AA and AAA readability for Blue against any background.

Check Contrast

Shades & Tints Scale

Generate a full 10-step tonal scale from 50 to 900 for Blue.

Expand Scale

CSS Gradient Generator

Create linear and radial gradients blending Blue with complementary hues.

Build Gradients

Frequently Asked Questions About Blue (#0000FF)

Authoritative answers covering Blue color codes, WCAG contrast compliance, and UI design systems.

What are the exact digital and print color codes for Blue (#0000FF)?

Blue is defined by the HEX code #0000FF. Its digital screen RGB coordinates are R:0, G:0, B:255. Its cylindrical HSL values are Hue:240°, Saturation:100%, Lightness:50%. In HSV/HSB format, it is 240°, 100%, 100%. For four-color CMYK process printing, its ink percentages are C:100%, M:100%, Y:0%, K:0%.

Does Blue (#0000FF) pass WCAG 2.2 accessibility standards for text readability?

Against a pure white (#FFFFFF) background, Blue achieves a contrast ratio of 8.59:1 (Passing WCAG AA for normal body text, and Passing for large headings). Against dark slate (#0F172A), it achieves a contrast ratio of 2.08:1 (Failing WCAG AA).

What is the direct complementary color for Blue (#0000FF)?

The exact 180-degree optical complementary color for #0000FF is #FFFF00. When placed side-by-side, #0000FF and #FFFF00 create maximum visual tension and high click-through conversion rates.

What is the recommended role for Blue in the 60-30-10 UI design rule?

How can I copy and export Blue into Tailwind CSS and CSS variables?

You can define Blue in CSS custom properties as ':root { --color-custom: #0000FF; }' or paste it into your 'tailwind.config.js' file under 'theme.extend.colors'. You can also generate full palettes containing Blue using our interactive Color Palette Generator.

Which color family does Blue (#0000FF) belong to?

Blue belongs to the Blue family (Cool spectrum). You can explore full tonal ramps and curated palettes in our Blue Color Guide.