CSS named colour

Chartreuse

#7fff00

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

RGB: rgb(127 255 0)
HSL: 90°, 100%, 50%
OKLCh: 89.0% 0.265 136.0

Chartreuse in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#7fff00`
RGB	`rgb(127 255 0)`
RGB legacy	`rgb(127, 255, 0)`
RGB percent	`rgb(49.8% 100% 0%)`
HSL	`hsl(90.1 100% 50%)`
HSL legacy	`hsl(90.1, 100%, 50%)`
HSV / HSB	`hsv(90.1, 100%, 100%)`
HWB	`hwb(90.1 0% 0%)`
Nearest name	`chartreuse`
CMYK	`cmyk(50.2%, 0%, 100%, 0%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(89.026% 0.2648 136.007)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(89.026% -0.19051 0.18392)`
CIE LCh	`lch(90.05% 103.983 126.249)`
CIE Lab	`lab(90.05% -61.485 83.857)`
Display P3	`color(display-p3 0.6279 0.9884 0.3056)`
Rec. 2020	`color(rec2020 0.6776 0.9668 0.2754)`
srgb-linear	`color(srgb-linear 0.2122 1 0)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.4451 0.7603 0.1233)`

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

GLSL vec3 — sRGB	`vec3(0.498, 1.0, 0.0)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.212, 1.0, 0.0)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.498, 1.0, 0.0, 1.0)`
GLSL vec4 — linear	`vec4(0.212, 1.0, 0.0, 1.0)`
GLSL ivec3	`ivec3(127, 255, 0)`
HLSL float3 — sRGB	`float3(0.498, 1.0, 0.0)`
HLSL float3 — linear	`float3(0.212, 1.0, 0.0)`
HLSL float4 — sRGB	`float4(0.498, 1.0, 0.0, 1.0)`
HLSL half4 — sRGB	`half4(0.498, 1.0, 0.0, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.498, 1.0, 0.0)`
WGSL vec4f — sRGB	`vec4f(0.498, 1.0, 0.0, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.212, 1.0, 0.0)`

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

Unity Color	`new Color(0.498f, 1.0f, 0.0f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(127, 255, 0, 255)`
Unreal FLinearColor	`FLinearColor(0.2122f, 1.0f, 0.0f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(127, 255, 0, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.498, 1, 0, 1)`
Flutter Color	`Color(0xFF7FFF00)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(127, 255, 0)`
SwiftUI Color	`Color(red: 0.498, green: 1, blue: 0)`
UIKit UIColor	`UIColor(red: 0.498, green: 1, blue: 0, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x7FFF00`
0x hex (ARGB)	`0xFF7FFF00`
Array 0–1	`[0.498, 1, 0]`
Array 0–255	`[127, 255, 0]`
Decimal integer	`8388352`

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
Chartreuse on white	1.30:1	Fail	Lc 14	Not usable for text
Chartreuse on black	16.21:1	AAA	Lc 90	Body text, 18px and up

Chartreuse text on a white background

Chartreuse text on a black background

White text on Chartreuse

Black text on Chartreuse

Tonal scale

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

50#dcffc8
100#baff95
200#94fc57
300#75e61c
400#54c800
500#42a600
600#338800
700#256d00
800#1a5700
900#104500
950#032800

Tints and shades

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

Tint 1#98ff5c
Tint 2#afff86
Tint 3#c4ffa7
Tint 4#d9ffc6
Tint 5#ecffe3
Shade 1#62c800
Shade 2#479400
Shade 3#2d6300
Shade 4#163600
Shade 5#030f00

Colours that work with Chartreuse

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

#f8c4ff
#bbdeff
#ffc6c9
#eee100
#00ffbb

Closest CSS names

chartreuseexact match
lawngreenΔEok 0.009
greenyellowΔEok 0.047
limeΔEok 0.050
springgreenΔEok 0.073
mediumspringgreenΔEok 0.105