#171721

Accessibility

AAA

17.78:1

Vs white / black

17.78:1 · 1.18:1

Sources

Library color

Codes

Formats

HEX

#171721

RGB

rgb(23, 23, 33)

RGBA

rgba(23, 23, 33, 1)

HSL

hsl(240, 18%, 11%)

HSLA

hsla(240, 18%, 11%, 1)

HSV

hsv(240, 30%, 13%)

LAB

lab(8.17% 2.92 -6.94)

LCH

lch(8.17% 7.53 292.82)

OKLAB

oklab(0.2095 0.005 -0.0191)

OKLCH

oklch(0.2095 0.0197 284.67)

XYZ

xyz(0.93, 0.90, 1.56)

CMYK

cmyk(30%, 30%, 0%, 87%)

CSS

color: #171721;

CSS variable

--color-171721: #171721;

SCSS

$color-171721: #171721;

JavaScript

const color = "#171721";

TypeScript

const color: string = "#171721";

React

style={{ backgroundColor: "#171721" }}

JSON

{ "hex": "#171721", "rgb": { "r": 23, "g": 23, "b": 33 }, "oklch": "oklch(0.2095 0.0197 284.67)" }

Export

Developer code

css

:root {
  --#171721-1: #171721;
}

Design systems

Nearest official tokens

An arbitrary HEX is not an official Tailwind, Material, or Bootstrap color. Distance is CIEDE2000.

Nearest Tailwind color

gray-900

Noticeably different · ΔE 3.74 · #111827

Nearest CSS named color

Black

Very different · ΔE 8.45 · #000000

Nearest Material color

grey-900

Very different · ΔE 7.5 · #212121

Nearest Bootstrap color

dark

Very different · ΔE 6.98 · #212529

OKLCH

Perceptual 50–950 scale

Generated in OKLCH from this hex. Not an official Tailwind scale unless the hex itself is a Tailwind token.

50f3f4ff 100e6e6f5 200d2d3e1 300bcbccb 400a0a0ae 500848592 6006e6f7c 700585865 80042424e 9002e2e39 950191924

Palette

Tints & shades

Full scale from light tints through the base color into deep shades

ececed d8d8da c5c5c8 b2b2b5 9e9ea3 8b8b90 78787e 64646b 515159 3e3e46 2a2a34 171721 15151e 13131c 111119 0f0f16 0d0d13 0c0c11 0a0a0e 08080b 060608 040405 020203

Palette

Tints

Mixed toward white — soft backgrounds and highlights

ececed d8d8da c5c5c8 b2b2b5 9e9ea3 8b8b90 78787e 64646b 515159 3e3e46 2a2a34

Palette

Shades

Mixed toward black — depth, text, and emphasis

15151e 13131c 111119 0f0f16 0d0d13 0c0c11 0a0a0e 08080b 060608 040405 020203

Palette

Tones

Mixed toward neutral grey — muted UI surfaces

202029 292931 313139 3a3a41 434349 4c4c51 545458 5d5d60 666668 6f6f70 777778

Harmony

Complementary

Opposite on the color wheel for contrast

#171721Stop 1 #212117Stop 2

Harmony

Analogous

Neighbors that sit comfortably together

#171C21Stop 1 #171721Stop 2 #1C1721Stop 3

Harmony

Triadic

Evenly spaced triad for vibrant sets

#171721Stop 1 #211717Stop 2 #172117Stop 3

Harmony

Split complementary

Base plus two accents beside the complement

#171721Stop 1 #211C17Stop 2 #1C2117Stop 3

Harmony

Monochromatic

Same hue, varied lightness and saturation

#2A2A3CStop 1 #494969Stop 2 #696996Stop 3 #9696B6Stop 4 #C3C3D5Stop 5

Using this color

Where #171721 works

#171721 (#171721) sits in the indigo family at about 240° hue, 18% saturation, and 11% lightness. Contrast is 17.78:1 on white and 1.18:1 on black, so white labels read more clearly on the swatch itself. Nearest Tailwind token: gray-900 (approximation unless the hex is an official scale stop).

Sensible jobs for this swatch

body text, chrome, and dark-mode surfaces
text or icons on a white canvas

On a black or near-black UI, #171721 is 1.18:1. Prefer it as a fill, border, or large heading rather than 16px copy.

Family context: Intuition, depth, and sincerity. Common in enterprise software and thoughtful products. Common uses still include buttons, charts, and accents in the Indigo range — always verify the pair for this exact hex in the contrast checker.

Similar & related colors

Nearby colors from the library by perceptual distance

Tailwind gray 900#111827 Material You On Surface#1C1B1F Tailwind slate 950#020617 Tailwind zinc 900#18181B Tailwind gray 950#030712 Tailwind slate 900#0F172A Tailwind zinc 800#27272A Tailwind neutral 900#171717 Tailwind zinc 950#09090B Bootstrap dark#212529 Tailwind gray 800#1F2937 Material Grey 900#212121