CSS named colour

Royal Blue

#4169e1

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

RGB: rgb(65 105 225)
HSL: 225°, 73%, 57%
OKLCh: 56.0% 0.188 266.4

Royal Blue in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#4169e1`
RGB	`rgb(65 105 225)`
RGB legacy	`rgb(65, 105, 225)`
RGB percent	`rgb(25.49% 41.18% 88.24%)`
HSL	`hsl(225 72.7% 56.9%)`
HSL legacy	`hsl(225, 72.7%, 56.9%)`
HSV / HSB	`hsv(225, 71.1%, 88.2%)`
HWB	`hwb(225 25.5% 11.8%)`
Nearest name	`royalblue`
CMYK	`cmyk(71.1%, 53.3%, 0%, 11.8%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(55.985% 0.18823 266.4)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(55.985% -0.01182 -0.18786)`
CIE LCh	`lch(46.8% 68.989 284.937)`
CIE Lab	`lab(46.8% 17.783 -66.658)`
Display P3	`color(display-p3 0.2904 0.4077 0.8525)`
Rec. 2020	`color(rec2020 0.3116 0.3576 0.8295)`
srgb-linear	`color(srgb-linear 0.0529 0.1413 0.7529)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.2082 0.1666 0.7336)`

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

GLSL vec3 — sRGB	`vec3(0.255, 0.412, 0.882)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.053, 0.141, 0.753)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.255, 0.412, 0.882, 1.0)`
GLSL vec4 — linear	`vec4(0.053, 0.141, 0.753, 1.0)`
GLSL ivec3	`ivec3(65, 105, 225)`
HLSL float3 — sRGB	`float3(0.255, 0.412, 0.882)`
HLSL float3 — linear	`float3(0.053, 0.141, 0.753)`
HLSL float4 — sRGB	`float4(0.255, 0.412, 0.882, 1.0)`
HLSL half4 — sRGB	`half4(0.255, 0.412, 0.882, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.255, 0.412, 0.882)`
WGSL vec4f — sRGB	`vec4f(0.255, 0.412, 0.882, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.053, 0.141, 0.753)`

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

Unity Color	`new Color(0.255f, 0.412f, 0.882f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(65, 105, 225, 255)`
Unreal FLinearColor	`FLinearColor(0.0529f, 0.1413f, 0.7529f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(65, 105, 225, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.255, 0.412, 0.882, 1)`
Flutter Color	`Color(0xFF4169E1)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(65, 105, 225)`
SwiftUI Color	`Color(red: 0.255, green: 0.412, blue: 0.882)`
UIKit UIColor	`UIColor(red: 0.255, green: 0.412, blue: 0.882, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x4169E1`
0x hex (ARGB)	`0xFF4169E1`
Array 0–1	`[0.255, 0.412, 0.882]`
Array 0–255	`[65, 105, 225]`
Decimal integer	`4286945`

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
Royal Blue on white	4.85:1	AA	Lc 73	Headings and large text
Royal Blue on black	4.33:1	AA Large	Lc 29	Not usable for text

Royal Blue text on a white background

Royal Blue text on a black background

White text on Royal Blue

Black text on Royal Blue

Tonal scale

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

50#eef8ff
100#dfeeff
200#c7dcff
300#a5c4ff
400#7ba4ff
500#5682fc
600#4067db
700#2e4fba
800#203c9d
900#152c83
950#06125a

Tints and shades

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

Tint 1#5e84e8
Tint 2#7c9def
Tint 3#9cb6f4
Tint 4#bccff9
Tint 5#dde7fd
Shade 1#3151b0
Shade 2#223a82
Shade 3#132456
Shade 4#06102f
Shade 5#01020b

Colours that work with Royal Blue

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

#966d00
#cb3532
#008f20
#007ebe
#8254d3

Closest CSS names

royalblueexact match
slateblueΔEok 0.064
mediumslateblueΔEok 0.078
dodgerblueΔEok 0.102
steelblueΔEok 0.105
mediumpurpleΔEok 0.116