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Color Directory/Slate 300

Slate 300 (#CBD5E1)

Luminance: 66% · Nearest standard name: Slate 300

Generate Around This Color
SLATE 300
#CBD5E1
rgb(203, 213, 225) · hsl(213°, 27%, 84%)
HEX#CBD5E1
RGB203, 213, 225
HSL213°, 27%, 84%
HSV / HSB213°, 10%, 88%
CMYK (Print)10%, 5%, 0%, 12%

Color Harmonies

Complementary

#CBD5E1#E1D7CB

Analogous

#CBE0E1#CBD5E1#CCCBE1

Triadic

#CBD5E1#E1CBD5#D5E1CB

Tints & Shades

Lighter Tints
Darker Shades

WCAG 2.2 Contrast Verification

Against White (#FFFFFF)1.48:1

Sample text rendered with #CBD5E1 on white

AA Normal: FAILAA Large: FAIL
Against Dark (#0F172A)12.02:1

Sample text rendered with #CBD5E1 on dark

AA Normal: PASSAA Large: PASS

Palettes Featuring Similar Tones

#0F172ACopy
#1E293BCopy
#2563EBCopy
#38BDF8Copy
#F8FAFCCopy
cp-featured-01Technology
SaaS Velocity Blue
TechModernCool
#2B0938Copy
#6A0572Copy
#AB2E64Copy
#D85A52Copy
#F9A03FCopy
cp-featured-02Sunset
Malibu Dusk Glow
SunsetGradientCreative
#E76F51Copy
#F4A261Copy
#E9C46ACopy
#2A9D8FCopy
#264653Copy
cp-featured-03Vintage
1970s California Sun
VintageRetroWarm
#050505Copy
#00FF66Copy
#00F0FFCopy
#FF0055Copy
#FFE600Copy
cp-featured-04Gaming
Cyber Glitch Protocol
GamingFuturisticNeon
Comprehensive Color Profile & Design Architecture

The Complete Color Guide to Slate 300 (#CBD5E1)

Slate 300 (#CBD5E1) is a distinct shade within the Blue chromatic spectrum. Characterized by an optical luminance of 66% 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#CBD5E1
RGB Space203, 213, 225
HSL Values213°, 27%, 84%
HSV / HSB213°, 10%, 88%
CMYK Ink10%, 5%, 0%, 12%
TemperatureCool

Optical Color Harmony Formulas for Slate 300

Geometric intervals calculated from #CBD5E1 on the 360-degree color wheel.

Direct Polar (180°)#E1D7CB

Complementary Harmony

Pairs Slate 300 with its polar opposite (#E1D7CB) to create maximum optical contrast, perfect for high-converting call-to-action buttons.

Adjacent (±30°)#CBE0E1 · #CCCBE1

Analogous Harmony

Positions adjacent neighboring hues on either side of Slate 300 for serene, gentle, and organic visual transitions.

Split Angles (150° / 210°)#E1CCCB · #E0E1CB

Split-Complementary

Uses the two colors flanking the direct complement of Slate 300, offering rich visual variety without harsh chromatic vibration.

Triangular (120°)#E1CBD5 · #D5E1CB

Triadic Harmony

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

Rectangular (90°)#E1CBE0 · #E1D7CB · #CBE1CC

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 Slate 300

Lock #CBD5E1 inside our interactive generator to calculate live matching palettes in real time.

Launch Palette Generator

The 60-30-10 UI Implementation Role for Slate 300

Recommended proportional volume and semantic interface assignment.

Recommended Assignment: Interactive Brand Accent (10% Volume)

With a saturation of 27% and lightness of 84%, Slate 300 (#CBD5E1) 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 SurfaceOptimal canvas surface
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 Slate 300 with intentional neutral whitespace reinforces authority and conversion clarity.

Production Code Tokens for Slate 300

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

CSS Custom Properties (:root)Vanilla CSS
:root {
  --color-cbd5e1: #CBD5E1;
  --color-cbd5e1-rgb: 203, 213, 225;
  --color-cbd5e1-hsl: 213deg 27% 84%;
}
tailwind.config.jsTailwind CSS
module.exports = {
  theme: {
    extend: {
      colors: {
        'cbd5e1': '#CBD5E1',
      }
    }
  }
};

Explore Related Color Tools for Slate 300

Continue developing your color system with specialized design tools.

Palette Generator

Generate harmonious 5-color palettes anchored to Slate 300.

Launch Tool

WCAG Contrast Checker

Verify Level AA and AAA readability for Slate 300 against any background.

Check Contrast

Shades & Tints Scale

Generate a full 10-step tonal scale from 50 to 900 for Slate 300.

Expand Scale

CSS Gradient Generator

Create linear and radial gradients blending Slate 300 with complementary hues.

Build Gradients

Frequently Asked Questions About Slate 300 (#CBD5E1)

Authoritative answers covering Slate 300 color codes, WCAG contrast compliance, and UI design systems.

What are the exact digital and print color codes for Slate 300 (#CBD5E1)?
Slate 300 is defined by the HEX code #CBD5E1. Its digital screen RGB coordinates are R:203, G:213, B:225. Its cylindrical HSL values are Hue:213°, Saturation:27%, Lightness:84%. In HSV/HSB format, it is 213°, 10%, 88%. For four-color CMYK process printing, its ink percentages are C:10%, M:5%, Y:0%, K:12%.
Does Slate 300 (#CBD5E1) pass WCAG 2.2 accessibility standards for text readability?
Against a pure white (#FFFFFF) background, Slate 300 achieves a contrast ratio of 1.48:1 (Failing WCAG AA for normal body text, and Failing for large headings). Against dark slate (#0F172A), it achieves a contrast ratio of 12.02:1 (Passing WCAG AA).
What is the direct complementary color for Slate 300 (#CBD5E1)?
The exact 180-degree optical complementary color for #CBD5E1 is #E1D7CB. When placed side-by-side, #CBD5E1 and #E1D7CB create maximum visual tension and high click-through conversion rates.
What is the recommended role for Slate 300 in the 60-30-10 UI design rule?
With a saturation of 27% and lightness of 84%, Slate 300 (#CBD5E1) 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.
How can I copy and export Slate 300 into Tailwind CSS and CSS variables?
You can define Slate 300 in CSS custom properties as ':root { --color-custom: #CBD5E1; }' or paste it into your 'tailwind.config.js' file under 'theme.extend.colors'. You can also generate full palettes containing Slate 300 using our interactive Color Palette Generator.
Which color family does Slate 300 (#CBD5E1) belong to?
Slate 300 belongs to the Blue family (Cool spectrum). You can explore full tonal ramps and curated palettes in our Blue Color Guide.