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Color Directory/Slate 900

Slate 900 (#0F172A)

Luminance: 1% · Nearest standard name: Slate 900

Generate Around This Color
SLATE 900
#0F172A
rgb(15, 23, 42) · hsl(222°, 47%, 11%)
HEX#0F172A
RGB15, 23, 42
HSL222°, 47%, 11%
HSV / HSB222°, 64%, 16%
CMYK (Print)64%, 45%, 0%, 84%

Color Harmonies

Complementary

#0F172A#29210F

Analogous

#0F2429#0F172A#140F29

Triadic

#0F172A#290F17#17290F

Tints & Shades

Lighter Tints
Darker Shades

WCAG 2.2 Contrast Verification

Against White (#FFFFFF)17.85:1

Sample text rendered with #0F172A on white

AA Normal: PASSAA Large: PASS
Against Dark (#0F172A)1.00:1

Sample text rendered with #0F172A on dark

AA Normal: FAILAA Large: FAIL

Palettes Featuring Similar Tones

#0F172ACopy
#1E293BCopy
#2563EBCopy
#38BDF8Copy
#F8FAFCCopy
cp-featured-01Technology
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#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 900 (#0F172A)

Slate 900 (#0F172A) is a distinct shade within the Blue chromatic spectrum. Characterized by an optical luminance of 1% 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#0F172A
RGB Space15, 23, 42
HSL Values222°, 47%, 11%
HSV / HSB222°, 64%, 16%
CMYK Ink64%, 45%, 0%, 84%
TemperatureCool

Optical Color Harmony Formulas for Slate 900

Geometric intervals calculated from #0F172A on the 360-degree color wheel.

Direct Polar (180°)#29210F

Complementary Harmony

Pairs Slate 900 with its polar opposite (#29210F) to create maximum optical contrast, perfect for high-converting call-to-action buttons.

Adjacent (±30°)#0F2429 · #140F29

Analogous Harmony

Positions adjacent neighboring hues on either side of Slate 900 for serene, gentle, and organic visual transitions.

Split Angles (150° / 210°)#29140F · #24290F

Split-Complementary

Uses the two colors flanking the direct complement of Slate 900, offering rich visual variety without harsh chromatic vibration.

Triangular (120°)#290F17 · #17290F

Triadic Harmony

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

Rectangular (90°)#290F24 · #29210F · #0F2914

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 900

Lock #0F172A inside our interactive generator to calculate live matching palettes in real time.

Launch Palette Generator

The 60-30-10 UI Implementation Role for Slate 900

Recommended proportional volume and semantic interface assignment.

Recommended Assignment: High-Contrast Dark Canvas / Typographic Anchor (30% to 60% Volume)

With a deep, low lightness of 11%, Slate 900 (#0F172A) provides structural weight for primary headings, body copy, and dark mode background canvases, delivering superior readability against light elements.

Light Mode SurfaceIdeal for buttons and badges
Dark Mode AdaptationOptimal dark canvas backdrop
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 900 with intentional neutral whitespace reinforces authority and conversion clarity.

Production Code Tokens for Slate 900

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

CSS Custom Properties (:root)Vanilla CSS
:root {
  --color-0f172a: #0F172A;
  --color-0f172a-rgb: 15, 23, 42;
  --color-0f172a-hsl: 222deg 47% 11%;
}
tailwind.config.jsTailwind CSS
module.exports = {
  theme: {
    extend: {
      colors: {
        '0f172a': '#0F172A',
      }
    }
  }
};

Explore Related Color Tools for Slate 900

Continue developing your color system with specialized design tools.

Palette Generator

Generate harmonious 5-color palettes anchored to Slate 900.

Launch Tool

WCAG Contrast Checker

Verify Level AA and AAA readability for Slate 900 against any background.

Check Contrast

Shades & Tints Scale

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

Expand Scale

CSS Gradient Generator

Create linear and radial gradients blending Slate 900 with complementary hues.

Build Gradients

Frequently Asked Questions About Slate 900 (#0F172A)

Authoritative answers covering Slate 900 color codes, WCAG contrast compliance, and UI design systems.

What are the exact digital and print color codes for Slate 900 (#0F172A)?
Slate 900 is defined by the HEX code #0F172A. Its digital screen RGB coordinates are R:15, G:23, B:42. Its cylindrical HSL values are Hue:222°, Saturation:47%, Lightness:11%. In HSV/HSB format, it is 222°, 64%, 16%. For four-color CMYK process printing, its ink percentages are C:64%, M:45%, Y:0%, K:84%.
Does Slate 900 (#0F172A) pass WCAG 2.2 accessibility standards for text readability?
Against a pure white (#FFFFFF) background, Slate 900 achieves a contrast ratio of 17.85:1 (Passing WCAG AA for normal body text, and Passing for large headings). Against dark slate (#0F172A), it achieves a contrast ratio of 1.00:1 (Failing WCAG AA).
What is the direct complementary color for Slate 900 (#0F172A)?
The exact 180-degree optical complementary color for #0F172A is #29210F. When placed side-by-side, #0F172A and #29210F create maximum visual tension and high click-through conversion rates.
What is the recommended role for Slate 900 in the 60-30-10 UI design rule?
With a deep, low lightness of 11%, Slate 900 (#0F172A) provides structural weight for primary headings, body copy, and dark mode background canvases, delivering superior readability against light elements.
How can I copy and export Slate 900 into Tailwind CSS and CSS variables?
You can define Slate 900 in CSS custom properties as ':root { --color-custom: #0F172A; }' or paste it into your 'tailwind.config.js' file under 'theme.extend.colors'. You can also generate full palettes containing Slate 900 using our interactive Color Palette Generator.
Which color family does Slate 900 (#0F172A) belong to?
Slate 900 belongs to the Blue family (Cool spectrum). You can explore full tonal ramps and curated palettes in our Blue Color Guide.