#CB311D
Closest named color: Sinopia (#BB3E03). oklch(55.4% 0.193 31), rgb(203, 49, 29).
Aa
White text reads best on this color (5.25:1).
About this color
#CB311D is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.193 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.038 away. White text reads best on it, at 5.25:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.193) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.99:1 |
| White text | 5.25:1 |
Values
| HEX | #CB311D |
| RGB | rgb(203, 49, 29) |
| HSL | hsl(7, 75%, 45%) |
| OKLCH | oklch(55.4% 0.193 31) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #CB311D | 5.25:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #CB311D | 3.99:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #CB311D text on white | 5.25:1 | AA | Lc 74.6 | Content text, not long reading |
| #CB311D text on black | 3.99:1 | AA large text | Lc -27.1 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FAE4E0
oklch(93.6% 0.025 29.9)
-
Step 200
200
#F8CEC6
oklch(88.5% 0.049 30.7)
-
Step 300
300
#F4AC9E
oklch(80.9% 0.088 31.3)
-
Step 400
400
#EA7C6A
oklch(70.6% 0.139 30.6)
-
Step 500
500
#E05540
oklch(63% 0.178 31.1)
-
Step 600
600 (this color)
#CB311D
oklch(55.4% 0.193 31)
-
Step 700
700
#B0220F
oklch(49.2% 0.18 31.1)
-
Step 800
800
#8F2011
oklch(42.8% 0.149 31.1)
-
Step 900
900
#732216
oklch(37.8% 0.116 31.3)
-
Step 950
950
#44150E
oklch(27% 0.074 30.9)
#CB311D with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #615618 | 0.207 |
| Deuteranopia (no green cones) | #877812 | 0.187 |
| Tritanopia (no blue cones) | #E0002E | 0.051 |
| Achromatopsia (no color) | #6C6C6C | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB311D
#CB311D
oklch(55.4% 0.193 31)
- #008192
#008192
oklch(55.3% 0.096 210.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #CB311D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.038
- Dull Red #BB3F3F ΔE 0.041
- Brick Orange #C14A09 ΔE 0.045
- Cherry #CF0234 ΔE 0.046
- Crimson #DC143C ΔE 0.052
- Scarlet #BE0119 ΔE 0.053
- Burnt Orange #C04E01 ΔE 0.054
- Faded Red #D3494E ΔE 0.056
Use #CB311D in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.