Colour reference

Zinc 900

#18181b

A near-black with a cool cast, common in dark UI.

RGB: rgb(24 24 27)
HSL: 240°, 6%, 10%
OKLCh: 21.0% 0.006 285.9

Zinc 900 in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#18181b`
RGB	`rgb(24 24 27)`
RGB legacy	`rgb(24, 24, 27)`
RGB percent	`rgb(9.41% 9.41% 10.59%)`
HSL	`hsl(240 5.9% 10%)`
HSL legacy	`hsl(240, 5.9%, 10%)`
HSV / HSB	`hsv(240, 11.1%, 10.6%)`
HWB	`hwb(240 9.4% 89.4%)`
Nearest name	`midnightblue (approx.)`
CMYK	`cmyk(11.1%, 11.1%, 0%, 89.4%)`Naive conversion. Real print work needs an ICC profile.

Perceptual & wide gamutModern CSS colour spaces for uniform scales and P3 displays.

OKLCh	`oklch(21.033% 0.00586 285.885)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(21.033% 0.0016 -0.00564)`
CIE LCh	`lch(8.346% 2.2 285.903)`
CIE Lab	`lab(8.346% 0.603 -2.116)`
Display P3	`color(display-p3 0.0941 0.0941 0.1049)`
Rec. 2020	`color(rec2020 0.0415 0.0412 0.0485)`
srgb-linear	`color(srgb-linear 0.0091 0.0091 0.011)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.009 0.0093 0.0117)`

ShadersGLSL, HLSL and WGSL vectors in both encoded and linear form.

GLSL vec3 — sRGB	`vec3(0.094, 0.094, 0.106)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.009, 0.009, 0.011)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.094, 0.094, 0.106, 1.0)`
GLSL vec4 — linear	`vec4(0.009, 0.009, 0.011, 1.0)`
GLSL ivec3	`ivec3(24, 24, 27)`
HLSL float3 — sRGB	`float3(0.094, 0.094, 0.106)`
HLSL float3 — linear	`float3(0.009, 0.009, 0.011)`
HLSL float4 — sRGB	`float4(0.094, 0.094, 0.106, 1.0)`
HLSL half4 — sRGB	`half4(0.094, 0.094, 0.106, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.094, 0.094, 0.106)`
WGSL vec4f — sRGB	`vec4f(0.094, 0.094, 0.106, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.009, 0.009, 0.011)`

Engines & appsConstructors for Unity, Unreal, Godot, Flutter, SwiftUI and Android.

Unity Color	`new Color(0.094f, 0.094f, 0.106f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(24, 24, 27, 255)`
Unreal FLinearColor	`FLinearColor(0.0091f, 0.0091f, 0.011f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(24, 24, 27, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.094, 0.094, 0.106, 1)`
Flutter Color	`Color(0xFF18181B)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(24, 24, 27)`
SwiftUI Color	`Color(red: 0.094, green: 0.094, blue: 0.106)`
UIKit UIColor	`UIColor(red: 0.094, green: 0.094, blue: 0.106, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x18181B`
0x hex (ARGB)	`0xFF18181B`
Array 0–1	`[0.094, 0.094, 0.106]`
Array 0–255	`[24, 24, 27]`
Decimal integer	`1579035`

Contrast and accessibility

WCAG 2 ratios are what audits and legislation reference. APCA is shown alongside because WCAG 2 is known to misjudge mid-tone backgrounds, and it is the basis of the WCAG 3 draft.

Pairing	WCAG 2 ratio	Level	APCA	Suitable for
Zinc 900 on white	17.72:1	AAA	Lc 105	Body text at any size
Zinc 900 on black	1.19:1	Fail	Lc 0	Not usable for text

Zinc 900 text on a white background

Zinc 900 text on a black background

White text on Zinc 900

Black text on Zinc 900

Tonal scale

Hue held fixed while lightness walks OKLCh, ready to use as a design system ramp.

50#f7f7fa
100#ededf0
200#dcdcdf
300#c5c5c9
400#a9a9ad
500#8b8b8f
600#717175
700#5a5a5e
800#47474a
900#38383a
950#1f1f21

Tints and shades

Mixed perceptually toward white and black, so the steps feel evenly spaced.

Tint 1#38383b
Tint 2#5b5b5e
Tint 3#818183
Tint 4#a9a9ab
Tint 5#d3d3d4
Shade 1#101013
Shade 2#09090b
Shade 3#040405
Shade 4#010101
Shade 5#000000

Colours that work with Zinc 900

Complementary, triadic and analogous partners, rotated in OKLCh so they keep the same apparent brightness.

#191916
#1b1816
#161918
#17191b
#19181a

Closest CSS names

midnightblueΔEok 0.158
navyΔEok 0.192
darkslategrayΔEok 0.196
darkblueΔEok 0.209
blackΔEok 0.210
indigoΔEok 0.216