Colour reference

UT Orange

#fb8500

RGB: rgb(251 133 0)
HSL: 32°, 100%, 49%
OKLCh: 73.4% 0.179 56.1

UT Orange in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#fb8500`
RGB	`rgb(251 133 0)`
RGB legacy	`rgb(251, 133, 0)`
RGB percent	`rgb(98.43% 52.16% 0%)`
HSL	`hsl(31.8 100% 49.2%)`
HSL legacy	`hsl(31.8, 100%, 49.2%)`
HSV / HSB	`hsv(31.8, 100%, 98.4%)`
HWB	`hwb(31.8 0% 1.6%)`
Nearest name	`darkorange`
CMYK	`cmyk(0%, 47%, 100%, 1.6%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(73.413% 0.17943 56.109)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(73.413% 0.10005 0.14894)`
CIE LCh	`lch(68.225% 85.468 60.893)`
CIE Lab	`lab(68.225% 41.575 74.675)`
Display P3	`color(display-p3 0.9237 0.5457 0.2011)`
Rec. 2020	`color(rec2020 0.8264 0.5229 0.1484)`
srgb-linear	`color(srgb-linear 0.9647 0.2346 0)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.4817 0.3729 0.0466)`

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

GLSL vec3 — sRGB	`vec3(0.984, 0.522, 0.0)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.965, 0.235, 0.0)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.984, 0.522, 0.0, 1.0)`
GLSL vec4 — linear	`vec4(0.965, 0.235, 0.0, 1.0)`
GLSL ivec3	`ivec3(251, 133, 0)`
HLSL float3 — sRGB	`float3(0.984, 0.522, 0.0)`
HLSL float3 — linear	`float3(0.965, 0.235, 0.0)`
HLSL float4 — sRGB	`float4(0.984, 0.522, 0.0, 1.0)`
HLSL half4 — sRGB	`half4(0.984, 0.522, 0.0, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.984, 0.522, 0.0)`
WGSL vec4f — sRGB	`vec4f(0.984, 0.522, 0.0, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.965, 0.235, 0.0)`

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

Unity Color	`new Color(0.984f, 0.522f, 0.0f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(251, 133, 0, 255)`
Unreal FLinearColor	`FLinearColor(0.9647f, 0.2346f, 0.0f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(251, 133, 0, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.984, 0.522, 0, 1)`
Flutter Color	`Color(0xFFFB8500)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(251, 133, 0)`
SwiftUI Color	`Color(red: 0.984, green: 0.522, blue: 0)`
UIKit UIColor	`UIColor(red: 0.984, green: 0.522, blue: 0, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0xFB8500`
0x hex (ARGB)	`0xFFFB8500`
Array 0–1	`[0.984, 0.522, 0]`
Array 0–255	`[251, 133, 0]`
Decimal integer	`16483584`

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
UT Orange on white	2.48:1	Fail	Lc 48	Large headings only
UT Orange on black	8.46:1	AAA	Lc 54	Large headings only

UT Orange text on a white background

UT Orange text on a black background

White text on UT Orange

Black text on UT Orange

Tonal scale

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

50#fff1de
100#ffe4c9
200#ffcda1
300#ffac64
400#f98719
500#d96600
600#b35200
700#924000
800#763100
900#5e2400
950#3a1000

Tints and shades

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

Tint 1#fe9b4e
Tint 2#ffb076
Tint 3#ffc59a
Tint 4#ffd8bc
Tint 5#ffecde
Shade 1#c56700
Shade 2#924b00
Shade 3#613000
Shade 4#351700
Shade 5#0e0400

Colours that work with UT Orange

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

#00b7ff
#00c8a5
#b58dff
#ff746b
#d89f00

Closest CSS names

darkorangeΔEok 0.018
coralΔEok 0.049
sandybrownΔEok 0.073
orangeΔEok 0.074
peruΔEok 0.081
darksalmonΔEok 0.084