CSS named colour

Medium Blue

#0000cd

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

RGB: rgb(0 0 205)
HSL: 240°, 100%, 40%
OKLCh: 38.3% 0.266 264.1

Medium Blue in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#0000cd`
RGB	`rgb(0 0 205)`
RGB legacy	`rgb(0, 0, 205)`
RGB percent	`rgb(0% 0% 80.39%)`
HSL	`hsl(240 100% 40.2%)`
HSL legacy	`hsl(240, 100%, 40.2%)`
HSV / HSB	`hsv(240, 100%, 80.4%)`
HWB	`hwb(240 0% 19.6%)`
Nearest name	`mediumblue`
CMYK	`cmyk(100%, 100%, 0%, 19.6%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(38.345% 0.26571 264.052)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(38.345% -0.02753 -0.26428)`
CIE LCh	`lch(22.657% 111.301 301.364)`
CIE Lab	`lab(22.657% 57.93 -95.037)`
Display P3	`color(display-p3 0 0 0.771)`
Rec. 2020	`color(rec2020 0.1151 0.0312 0.7385)`
srgb-linear	`color(srgb-linear 0 0 0.6105)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.1102 0.0441 0.5803)`

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

GLSL vec3 — sRGB	`vec3(0.0, 0.0, 0.804)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.0, 0.0, 0.61)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.0, 0.0, 0.804, 1.0)`
GLSL vec4 — linear	`vec4(0.0, 0.0, 0.61, 1.0)`
GLSL ivec3	`ivec3(0, 0, 205)`
HLSL float3 — sRGB	`float3(0.0, 0.0, 0.804)`
HLSL float3 — linear	`float3(0.0, 0.0, 0.61)`
HLSL float4 — sRGB	`float4(0.0, 0.0, 0.804, 1.0)`
HLSL half4 — sRGB	`half4(0.0, 0.0, 0.804, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.0, 0.0, 0.804)`
WGSL vec4f — sRGB	`vec4f(0.0, 0.0, 0.804, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.0, 0.0, 0.61)`

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

Unity Color	`new Color(0.0f, 0.0f, 0.804f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(0, 0, 205, 255)`
Unreal FLinearColor	`FLinearColor(0.0f, 0.0f, 0.6105f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(0, 0, 205, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0, 0, 0.804, 1)`
Flutter Color	`Color(0xFF0000CD)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(0, 0, 205)`
SwiftUI Color	`Color(red: 0, green: 0, blue: 0.804)`
UIKit UIColor	`UIColor(red: 0, green: 0, blue: 0.804, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x0000CD`
0x hex (ARGB)	`0xFF0000CD`
Array 0–1	`[0, 0, 0.804]`
Array 0–255	`[0, 0, 205]`
Decimal integer	`205`

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
Medium Blue on white	11.16:1	AAA	Lc 92	Body text at any size
Medium Blue on black	1.88:1	Fail	Lc 10	Not usable for text

Medium Blue text on a white background

Medium Blue text on a black background

White text on Medium Blue

Black text on Medium 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#447fff
600#1c5aff
700#0b41e0
800#012bbf
900#0018a2
950#010072

Tints and shades

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

Tint 1#194dda
Tint 2#4575e5
Tint 3#7199ee
Tint 4#9fbcf6
Tint 5#cedefb
Shade 1#0000a0
Shade 2#000076
Shade 3#00004e
Shade 4#000029
Shade 5#000009

Colours that work with Medium Blue

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

#5b3d00
#890009
#005500
#004a72
#5300af

Closest CSS names

mediumblueexact match
blueΔEok 0.083
darkblueΔEok 0.116
navyΔEok 0.137
midnightblueΔEok 0.158
darkslateblueΔEok 0.160