Colour reference

Blue Green

#219ebc

RGB: rgb(33 158 188)
HSL: 192°, 70%, 43%
OKLCh: 64.8% 0.110 219.0

Blue Green in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#219ebc`
RGB	`rgb(33 158 188)`
RGB legacy	`rgb(33, 158, 188)`
RGB percent	`rgb(12.94% 61.96% 73.73%)`
HSL	`hsl(191.6 70.1% 43.3%)`
HSL legacy	`hsl(191.6, 70.1%, 43.3%)`
HSV / HSB	`hsv(191.6, 82.4%, 73.7%)`
HWB	`hwb(191.6 12.9% 26.3%)`
Nearest name	`cadetblue (approx.)`
CMYK	`cmyk(82.4%, 16%, 0%, 26.3%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(64.843% 0.11012 218.999)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(64.843% -0.08558 -0.0693)`
CIE LCh	`lch(59.797% 36.207 224.646)`
CIE Lab	`lab(59.797% -25.76 -25.444)`
Display P3	`color(display-p3 0.2999 0.6106 0.724)`
Rec. 2020	`color(rec2020 0.3602 0.5601 0.6913)`
srgb-linear	`color(srgb-linear 0.0152 0.3419 0.5029)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.2193 0.2841 0.5191)`

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

GLSL vec3 — sRGB	`vec3(0.129, 0.62, 0.737)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.015, 0.342, 0.503)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.129, 0.62, 0.737, 1.0)`
GLSL vec4 — linear	`vec4(0.015, 0.342, 0.503, 1.0)`
GLSL ivec3	`ivec3(33, 158, 188)`
HLSL float3 — sRGB	`float3(0.129, 0.62, 0.737)`
HLSL float3 — linear	`float3(0.015, 0.342, 0.503)`
HLSL float4 — sRGB	`float4(0.129, 0.62, 0.737, 1.0)`
HLSL half4 — sRGB	`half4(0.129, 0.62, 0.737, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.129, 0.62, 0.737)`
WGSL vec4f — sRGB	`vec4f(0.129, 0.62, 0.737, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.015, 0.342, 0.503)`

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

Unity Color	`new Color(0.129f, 0.62f, 0.737f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(33, 158, 188, 255)`
Unreal FLinearColor	`FLinearColor(0.0152f, 0.3419f, 0.5029f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(33, 158, 188, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.129, 0.62, 0.737, 1)`
Flutter Color	`Color(0xFF219EBC)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(33, 158, 188)`
SwiftUI Color	`Color(red: 0.129, green: 0.62, blue: 0.737)`
UIKit UIColor	`UIColor(red: 0.129, green: 0.62, blue: 0.737, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x219EBC`
0x hex (ARGB)	`0xFF219EBC`
Array 0–1	`[0.129, 0.62, 0.737]`
Array 0–255	`[33, 158, 188]`
Decimal integer	`2203324`

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 Green on white	3.14:1	AA Large	Lc 58	Large headings only
Blue Green on black	6.68:1	AA	Lc 44	Non-text elements only

Blue Green text on a white background

Blue Green text on a black background

White text on Blue Green

Black text on Blue Green

Tonal scale

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

50#d4ffff
100#b9f9ff
200#93ebff
300#75d5f1
400#4db9d7
500#1a9ab8
600#007f9c
700#006781
800#005269
900#004154
950#002534

Tints and shades

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

Tint 1#56aec7
Tint 2#7cbed3
Tint 3#9ecfde
Tint 4#bfdfe9
Tint 5#dfeff4
Shade 1#177b93
Shade 2#0e5a6c
Shade 3#063a47
Shade 4#021e25
Shade 5#000508

Colours that work with Blue Green

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

#c7765b
#bb73a5
#a08f36
#10a49c
#5693cf

Closest CSS names

cadetblueΔEok 0.055
lightseagreenΔEok 0.072
steelblueΔEok 0.078
darkcyanΔEok 0.085
lightslategrayΔEok 0.088
cornflowerblueΔEok 0.099