CSS named colour

Dark Blue

#00008b

A CSS named colour: darkblue is valid anywhere a colour is expected.

RGB: rgb(0 0 139)
HSL: 240°, 100%, 27%
OKLCh: 28.8% 0.199 264.1

Dark Blue in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#00008b`
RGB	`rgb(0 0 139)`
RGB legacy	`rgb(0, 0, 139)`
RGB percent	`rgb(0% 0% 54.51%)`
HSL	`hsl(240 100% 27.3%)`
HSL legacy	`hsl(240, 100%, 27.3%)`
HSV / HSB	`hsv(240, 100%, 54.5%)`
HWB	`hwb(240 0% 45.5%)`
Nearest name	`darkblue`
CMYK	`cmyk(100%, 100%, 0%, 45.5%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(28.782% 0.19944 264.052)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(28.782% -0.02067 -0.19837)`
CIE LCh	`lch(13.016% 83.544 301.364)`
CIE Lab	`lab(13.016% 43.483 -71.336)`
Display P3	`color(display-p3 0 0 0.5221)`
Rec. 2020	`color(rec2020 0.0503 0.0132 0.4695)`
srgb-linear	`color(srgb-linear 0 0 0.2582)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.0466 0.0186 0.2454)`

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

GLSL vec3 — sRGB	`vec3(0.0, 0.0, 0.545)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.0, 0.0, 0.258)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.0, 0.0, 0.545, 1.0)`
GLSL vec4 — linear	`vec4(0.0, 0.0, 0.258, 1.0)`
GLSL ivec3	`ivec3(0, 0, 139)`
HLSL float3 — sRGB	`float3(0.0, 0.0, 0.545)`
HLSL float3 — linear	`float3(0.0, 0.0, 0.258)`
HLSL float4 — sRGB	`float4(0.0, 0.0, 0.545, 1.0)`
HLSL half4 — sRGB	`half4(0.0, 0.0, 0.545, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.0, 0.0, 0.545)`
WGSL vec4f — sRGB	`vec4f(0.0, 0.0, 0.545, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.0, 0.0, 0.258)`

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

Unity Color	`new Color(0.0f, 0.0f, 0.545f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(0, 0, 139, 255)`
Unreal FLinearColor	`FLinearColor(0.0f, 0.0f, 0.2582f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(0, 0, 139, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0, 0, 0.545, 1)`
Flutter Color	`Color(0xFF00008B)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(0, 0, 139)`
SwiftUI Color	`Color(red: 0, green: 0, blue: 0.545)`
UIKit UIColor	`UIColor(red: 0, green: 0, blue: 0.545, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x00008B`
0x hex (ARGB)	`0xFF00008B`
Array 0–1	`[0, 0, 0.545]`
Array 0–255	`[0, 0, 139]`
Decimal integer	`139`

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
Dark Blue on white	15.30:1	AAA	Lc 100	Body text at any size
Dark Blue on black	1.37:1	Fail	Lc 0	Not usable for text

Dark Blue text on a white background

Dark Blue text on a black background

White text on Dark Blue

Black text on Dark Blue

Tonal scale

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

50#edf8ff
100#deeeff
200#c4ddff
300#a2c5ff
400#76a5ff
500#4b82ff
600#3467e0
700#224fbf
800#143ba2
900#0a2b88
950#00115d

Tints and shades

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

Tint 1#183ea1
Tint 2#4266b6
Tint 3#6e8cca
Tint 4#9db2dd
Tint 5#cdd8ef
Shade 1#00006c
Shade 2#00004e
Shade 3#000032
Shade 4#000019
Shade 5#000004

Colours that work with Dark Blue

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

#3d2600
#5d0002
#003800
#00304e
#370079

Closest CSS names

darkblueexact match
navyΔEok 0.020
midnightblueΔEok 0.061
mediumblueΔEok 0.116
indigoΔEok 0.134
darkslateblueΔEok 0.159