Colour reference

Blue 500

#3b82f6

Probably the most used interface blue on the web.

RGB: rgb(59 130 246)
HSL: 217°, 91%, 60%
OKLCh: 62.3% 0.188 259.8

Blue 500 in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#3b82f6`
RGB	`rgb(59 130 246)`
RGB legacy	`rgb(59, 130, 246)`
RGB percent	`rgb(23.14% 50.98% 96.47%)`
HSL	`hsl(217.2 91.2% 59.8%)`
HSL legacy	`hsl(217.2, 91.2%, 59.8%)`
HSV / HSB	`hsv(217.2, 76%, 96.5%)`
HWB	`hwb(217.2 23.1% 3.5%)`
Nearest name	`dodgerblue (approx.)`
CMYK	`cmyk(76%, 47.2%, 0%, 3.5%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(62.308% 0.18801 259.815)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(62.308% -0.03325 -0.18505)`
CIE LCh	`lch(54.619% 66.372 277.587)`
CIE Lab	`lab(54.619% 8.763 -65.791)`
Display P3	`color(display-p3 0.3047 0.5035 0.9338)`
Rec. 2020	`color(rec2020 0.3558 0.4555 0.9202)`
srgb-linear	`color(srgb-linear 0.0437 0.2232 0.9216)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.2642 0.2355 0.9034)`

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

GLSL vec3 — sRGB	`vec3(0.231, 0.51, 0.965)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.044, 0.223, 0.922)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.231, 0.51, 0.965, 1.0)`
GLSL vec4 — linear	`vec4(0.044, 0.223, 0.922, 1.0)`
GLSL ivec3	`ivec3(59, 130, 246)`
HLSL float3 — sRGB	`float3(0.231, 0.51, 0.965)`
HLSL float3 — linear	`float3(0.044, 0.223, 0.922)`
HLSL float4 — sRGB	`float4(0.231, 0.51, 0.965, 1.0)`
HLSL half4 — sRGB	`half4(0.231, 0.51, 0.965, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.231, 0.51, 0.965)`
WGSL vec4f — sRGB	`vec4f(0.231, 0.51, 0.965, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.044, 0.223, 0.922)`

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

Unity Color	`new Color(0.231f, 0.51f, 0.965f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(59, 130, 246, 255)`
Unreal FLinearColor	`FLinearColor(0.0437f, 0.2232f, 0.9216f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(59, 130, 246, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.231, 0.51, 0.965, 1)`
Flutter Color	`Color(0xFF3B82F6)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(59, 130, 246)`
SwiftUI Color	`Color(red: 0.231, green: 0.51, blue: 0.965)`
UIKit UIColor	`UIColor(red: 0.231, green: 0.51, blue: 0.965, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x3B82F6`
0x hex (ARGB)	`0xFF3B82F6`
Array 0–1	`[0.231, 0.51, 0.965]`
Array 0–255	`[59, 130, 246]`
Decimal integer	`3900150`

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
Blue 500 on white	3.68:1	AA Large	Lc 64	Headings and large text
Blue 500 on black	5.71:1	AA	Lc 38	Non-text elements only

Blue 500 text on a white background

Blue 500 text on a black background

White text on Blue 500

Black text on Blue 500

Tonal scale

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

50#ebf8ff
100#dcefff
200#c1deff
300#9cc7ff
400#6ba8ff
500#3f86fb
600#276bda
700#1254b9
800#00409c
900#003083
950#001659

Tints and shades

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

Tint 1#5d99fa
Tint 2#7eaefd
Tint 3#9ec3ff
Tint 4#bed7ff
Tint 5#deebff
Shade 1#2c65c1
Shade 2#1e498f
Shade 3#112f5f
Shade 4#051634
Shade 5#01030e

Colours that work with Blue 500

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

#b57a00
#e24956
#3ba01b
#0095ce
#886cee

Closest CSS names

dodgerblueΔEok 0.036
royalblueΔEok 0.067
cornflowerblueΔEok 0.070
mediumslateblueΔEok 0.087
steelblueΔEok 0.101
mediumpurpleΔEok 0.113