#CB3911
Closest named color: Sinopia (#BB3E03). oklch(56% 0.189 34.7), rgb(203, 57, 17).
Aa
White text reads best on this color (5.08:1).
About this color
#CB3911 is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.189 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.032 away. White text reads best on it, at 5.08:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.189) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 4.13:1 |
| White text | 5.08:1 |
Values
| HEX | #CB3911 |
| RGB | rgb(203, 57, 17) |
| HSL | hsl(13, 85%, 43%) |
| OKLCH | oklch(56% 0.189 34.7) |
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 #CB3911 | 5.08:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #CB3911 | 4.13:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #CB3911 text on white | 5.08:1 | AA | Lc 73.7 | Content text, not long reading |
| #CB3911 text on black | 4.13:1 | AA large text | Lc -28.0 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FAE5DF
oklch(93.7% 0.025 36.5)
-
Step 200
200
#F6CFC5
oklch(88.5% 0.046 34.7)
-
Step 300
300
#F2AD9C
oklch(80.9% 0.085 34.3)
-
Step 400
400
#E87F65
oklch(70.7% 0.135 34.9)
-
Step 500
500
#DE5939
oklch(63.2% 0.173 34.8)
-
Step 600
600 (this color)
#CB3911
oklch(56% 0.189 34.7)
-
Step 700
700
#AD2900
oklch(49.1% 0.173 34.7)
-
Step 800
800
#8D2406
oklch(42.7% 0.145 34.9)
-
Step 900
900
#712411
oklch(37.6% 0.113 34.9)
-
Step 950
950
#43160C
oklch(27% 0.072 34.1)
#CB3911 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) | #665A05 | 0.197 |
| Deuteranopia (no green cones) | #8A7A00 | 0.177 |
| Tritanopia (no blue cones) | #E00033 | 0.064 |
| Achromatopsia (no color) | #6E6E6E | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB3911
#CB3911
oklch(56% 0.189 34.7)
- #008398
#008398
oklch(56.1% 0.099 214.1)
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 #CB3911, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.032
- Brick Orange #C14A09 ΔE 0.032
- Burnt Orange #C04E01 ΔE 0.041
- Dull Red #BB3F3F ΔE 0.046
- Rust Orange #C45508 ΔE 0.051
- Deep Orange #DC4D01 ΔE 0.053
- Burnt Siena #B75203 ΔE 0.056
- Faded Red #D3494E ΔE 0.057
Use #CB3911 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.