Colour reference
Red 500
#ef4444
A widely used mid red for destructive actions.
- RGB
- rgb(239 68 68)
- HSL
- 0°, 84%, 60%
- OKLCh
- 63.7% 0.208 25.3
Red 500 in every format
Web & CSSThe everyday formats for stylesheets and design tools.
| Hex | #ef4444 | |
|---|---|---|
| RGB | rgb(239 68 68) | |
| RGB legacy | rgb(239, 68, 68) | |
| RGB percent | rgb(93.73% 26.67% 26.67%) | |
| HSL | hsl(0 84.2% 60.2%) | |
| HSL legacy | hsl(0, 84.2%, 60.2%) | |
| HSV / HSB | hsv(0, 71.5%, 93.7%) | |
| HWB | hwb(0 26.7% 6.3%) | |
| Nearest name | orangered (approx.) | |
| CMYK | cmyk(0%, 71.5%, 71.5%, 6.3%)Naive conversion. Real print work needs an ICC profile. |
Perceptual & wide gamutModern CSS colour spaces for uniform scales and P3 displays.
| OKLCh | oklch(63.683% 0.20785 25.331)Modern CSS colour space for even palettes — better than HSL when building scales. | |
|---|---|---|
| OKLab | oklab(63.683% 0.18786 0.08893) | |
| CIE LCh | lch(55.785% 77.266 31.872) | |
| CIE Lab | lab(55.785% 65.616 40.798) | |
| Display P3 | color(display-p3 0.8651 0.3219 0.2966) | |
| Rec. 2020 | color(rec2020 0.7496 0.3135 0.2351) | |
| srgb-linear | color(srgb-linear 0.8632 0.0578 0.0578)Light-linear sRGB — the same numbers a shader wants for maths. | |
| CIE XYZ (D65) | color(xyz-d65 0.3871 0.2291 0.0785) |
ShadersGLSL, HLSL and WGSL vectors in both encoded and linear form.
| GLSL vec3 — sRGB | vec3(0.937, 0.267, 0.267)Encoded values. Use when writing straight to the framebuffer. | |
|---|---|---|
| GLSL vec3 — linear | vec3(0.863, 0.058, 0.058)Light-linear values. Use for lighting, blending and mixing. | |
| GLSL vec4 — sRGB | vec4(0.937, 0.267, 0.267, 1.0) | |
| GLSL vec4 — linear | vec4(0.863, 0.058, 0.058, 1.0) | |
| GLSL ivec3 | ivec3(239, 68, 68) | |
| HLSL float3 — sRGB | float3(0.937, 0.267, 0.267) | |
| HLSL float3 — linear | float3(0.863, 0.058, 0.058) | |
| HLSL float4 — sRGB | float4(0.937, 0.267, 0.267, 1.0) | |
| HLSL half4 — sRGB | half4(0.937, 0.267, 0.267, 1.0) | |
| WGSL vec3f — sRGB | vec3f(0.937, 0.267, 0.267) | |
| WGSL vec4f — sRGB | vec4f(0.937, 0.267, 0.267, 1.0) | |
| WGSL vec3<f32> — linear | vec3<f32>(0.863, 0.058, 0.058) |
Engines & appsConstructors for Unity, Unreal, Godot, Flutter, SwiftUI and Android.
| Unity Color | new Color(0.937f, 0.267f, 0.267f, 1.0f)Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255. | |
|---|---|---|
| Unity Color32 | new Color32(239, 68, 68, 255) | |
| Unreal FLinearColor | FLinearColor(0.8632f, 0.0578f, 0.0578f, 1.0f)FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255. | |
| Unreal FColor | FColor(239, 68, 68, 255)Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor. | |
| Godot Color | Color(0.937, 0.267, 0.267, 1) | |
| Flutter Color | Color(0xFFEF4444)Packed ARGB, so alpha comes first. | |
| Android Color | Color.rgb(239, 68, 68) | |
| SwiftUI Color | Color(red: 0.937, green: 0.267, blue: 0.267) | |
| UIKit UIColor | UIColor(red: 0.937, green: 0.267, blue: 0.267, alpha: 1) |
Raw valuesPacked integers and plain arrays.
| 0x hex | 0xEF4444 | |
|---|---|---|
| 0x hex (ARGB) | 0xFFEF4444 | |
| Array 0–1 | [0.937, 0.267, 0.267] | |
| Array 0–255 | [239, 68, 68] | |
| Decimal integer | 15680580 |
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 |
|---|---|---|---|---|
| Red 500 on white | 3.76:1 | AA Large | Lc 64 | Headings and large text |
| Red 500 on black | 5.58:1 | AA | Lc 38 | Non-text elements only |
Red 500 text on a white background
Red 500 text on a black background
White text on Red 500
Black text on Red 500
Tonal scale
Hue held fixed while lightness walks OKLCh, ready to use as a design system ramp.
- 50#fff0ec
- 100#ffe2dd
- 200#ffc9c2
- 300#ffa69d
- 400#ff716a
- 500#ef4444
- 600#cd252c
- 700#ad0018
- 800#900007
- 900#750001
- 950#480000
Tints and shades
Mixed perceptually toward white and black, so the steps feel evenly spaced.
- Tint 1#f66b64
- Tint 2#fc8b83
- Tint 3#ffa9a1
- Tint 4#ffc6c0
- Tint 5#ffe3df
- Shade 1#bb3333
- Shade 2#8a2323
- Shade 3#5c1414
- Shade 4#320707
- Shade 5#0d0101
Colours that work with Red 500
Complementary, triadic and analogous partners, rotated in OKLCh so they keep the same apparent brightness.
- #00a0b0
- #00a928
- #4d80ff
- #e44391
- #da6500
Closest CSS names
orangeredΔEok 0.050redΔEok 0.053tomatoΔEok 0.065indianredΔEok 0.068crimsonΔEok 0.070chocolateΔEok 0.094