Is #31323B accessible for body text on white?

#31323B has a contrast ratio of 12.73:1 against white, which is sufficient for WCAG AA body text (4.5:1).

What is the complementary color of #31323B?

The complement of #31323B is #3B3A31.

#31323B Gunmetal

rgb(49, 50, 59)

Color conversions

HEX: #31323B
RGB: rgb(49, 50, 59)
RGBA: rgba(49, 50, 59, 1)
HSL: hsl(234, 9%, 21%)
HSV / HSB: hsv(234, 17%, 23%)
CMYK: cmyk(17%, 15%, 0%, 77%)

Wide-gamut spaces

XYZ: xyz(3.196, 3.25, 4.596)
LAB: lab(21.02 1.83 -5.81)
LCH: lch(21.02 6.09 287.49)
OKLAB: oklab(31.98% 0.0029 -0.0157)
OKLCH: oklch(31.98% 0.016 280.43)
Nearest name: Gunmetal

Shades, tints and tones

Shades

Tints

Tones

Color harmonies

Complementary

The hue directly opposite on the color wheel. Maximum contrast, ideal for a single accent against a dominant brand color.

Analogous

Neighbouring hues that share a temperature. The safest harmony for calm, cohesive interfaces.

Triadic

Three hues evenly spaced 120 degrees apart. Vibrant and balanced — use one as dominant and the other two sparingly.

Split Complementary

The complement split into two adjacent hues. Nearly the contrast of complementary with noticeably less tension.

Square (Tetradic)

Four hues at 90-degree intervals. A rich set for illustration, data visualisation, and category coding.

Rectangle (Tetradic)

Two complementary pairs offset by 60 degrees. Gives two warm and two cool options in one system.

Monochromatic

A single hue across five lightness levels. The foundation of most UI scales and the most accessible starting point.

Similar colors

Closest matches

Opacity variations

#31323b1a

#31323b33

#31323b4d

#31323b66

#31323b80

#31323b99

#31323bb3

#31323bcc

#31323be6

#31323bff

On white

12.73:1

Body text AAA · Large text AA

On black

1.65:1

Body text Fail · Large text Fail

White-on-color contrast is 12.73:1.

Color blindness preview

Protanopia

No red cones — ~1% of men

Protanomaly

Reduced red sensitivity — ~1% of men

Deuteranopia

No green cones — ~1% of men

Deuteranomaly

Reduced green sensitivity — ~5% of men

Tritanopia

No blue cones — very rare

Tritanomaly

Reduced blue sensitivity — very rare

Achromatopsia

No color perception — ~1 in 30,000

Achromatomaly

Partial color perception — rare

Meaning, psychology and brand usage

The structural colour every interface actually runs on

Neutral grays carry no emotional charge, which is precisely their value: they let content and brand colour do the signalling. Their temperature matters more than designers expect — a cool gray beside a warm brand colour reads as a mistake.

Neutrality, professionalism, and precision. Overuse reads as noncommittal or unfinished.

Payne's gray, mixed rather than mined, became the painter's shortcut for atmospheric shadow. Swiss modernism turned systematic gray scales into a design methodology.

Build a full gray ramp before choosing a brand colour. Match the gray's temperature to the brand hue and reserve the darkest steps for type rather than large fills.

Common industries: Enterprise, Architecture, Automotive, Consulting, Hardware. Pairs well with a single saturated accent, warm white for text surfaces, near-black for hierarchy.

Code exports

CSS

:root {
  --color-gunmetal: #31323b;
  --color-gunmetal-rgb: 49 50 59;
  --color-gunmetal-hsl: 234 9% 21%;
  --color-gunmetal-oklch: 31.98% 0.016 280.43;
}

.element {
  color: #31323b;
  background-color: hsl(234, 9%, 21%);
  border: 1px solid rgb(49 50 59 / 40%);
}

SCSS

$gunmetal: #31323b;
$gunmetal-light: #98999d;
$gunmetal-dark: #19191e;

.element {
  color: $gunmetal;
  background: rgba($gunmetal, 0.12);

  &:hover {
    color: darken($gunmetal, 8%);
  }
}

LESS

@gunmetal: #31323b;
@gunmetal-light: lighten(@gunmetal, 12%);
@gunmetal-dark: darken(@gunmetal, 12%);

.element {
  color: @gunmetal;
  background: fade(@gunmetal, 12%);
}

Tailwind CSS

/* Tailwind v4 — src/styles.css */
@theme {
  --color-gunmetal-50: #d6d6d8;
  --color-gunmetal-100: #c1c2c4;
  --color-gunmetal-200: #adadb1;
  --color-gunmetal-300: #838489;
  --color-gunmetal-400: #5a5b62;
  --color-gunmetal-500: #31323b;
  --color-gunmetal-600: #2c2d35;
  --color-gunmetal-700: #222329;
  --color-gunmetal-800: #19191e;
  --color-gunmetal-900: #0f0f12;
}

/* Usage */
<div class="bg-gunmetal-500 text-gunmetal-50 ring-gunmetal-600" />

/* Arbitrary value, no config needed */
<div class="bg-[#31323b]" />

Bootstrap

// Bootstrap 5 — _variables.scss (before importing bootstrap)
$gunmetal: #31323b;
$primary: $gunmetal;

$theme-colors: map-merge($theme-colors, (
  "gunmetal": $gunmetal
));

// Generates .text-gunmetal, .bg-gunmetal, .btn-gunmetal
@import "bootstrap/scss/bootstrap";

Flutter

import 'package:flutter/material.dart';

const Color gunmetal = Color(0xFF31323B);

// As a MaterialColor swatch
const MaterialColor gunmetalSwatch = MaterialColor(0xFF31323B, <int, Color>{
  50: Color(0xFFD6D6D8),
  100: Color(0xFFC1C2C4),
  200: Color(0xFFADADB1),
  300: Color(0xFF838489),
  400: Color(0xFF5A5B62),
  500: Color(0xFF31323B),
  600: Color(0xFF2C2D35),
  700: Color(0xFF222329),
  800: Color(0xFF19191E),
  900: Color(0xFF0F0F12),
});

Swift / SwiftUI

import SwiftUI

extension Color {
    /// #31323b — Gunmetal
    static let gunmetal = Color(
        red: 0.1922,
        green: 0.1961,
        blue: 0.2314
    )
}

// UIKit
extension UIColor {
    static let gunmetal = UIColor(
        red: 0.1922,
        green: 0.1961,
        blue: 0.2314,
        alpha: 1.0
    )
}

Android

<!-- res/values/colors.xml -->
<resources>
    <color name="gunmetal">#31323B</color>
    <color name="gunmetal_translucent">#8031323B</color>
</resources>

<!-- Jetpack Compose -->
val Gunmetal = Color(0xFF31323B)

JavaScript

export const GUNMETAL = {
  hex: "#31323b",
  rgb: [49, 50, 59],
  hsl: [234, 9, 21],
  oklch: "oklch(31.98% 0.016 280.43)",
};

JSON tokens

{
  "$schema": "https://design-tokens.org/schema.json",
  "gunmetal": {
    "$type": "color",
    "$value": "#31323b",
    "$description": "Gunmetal — generated by ColorVerse AI"
  }
}