#CB3940
Closest named color: Dull Red (#BB3F3F). oklch(56.5% 0.182 22.8), rgb(203, 57, 64).
Aa
White text reads best on this color (5.00:1).
About this color
#CB3940 is a medium-dark, vivid red. In OKLCH its lightness is 57%, its chroma 0.182 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.031 away. White text reads best on it, at 5.00:1.
| Hue family | Reds |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.182) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #CB3940 |
| RGB | rgb(203, 57, 64) |
| HSL | hsl(357, 58%, 51%) |
| OKLCH | oklch(56.5% 0.182 22.8) |
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 #CB3940 | 5.00:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #CB3940 | 4.19:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #CB3940 text on white | 5.00:1 | AA | Lc 73.3 | Content text, not long reading |
| #CB3940 text on black | 4.19:1 | AA large text | Lc -28.4 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F6CECB
oklch(88.5% 0.046 23.1)
-
Step 300
300
#F1ACA8
oklch(80.9% 0.082 22.8)
-
Step 400
400
#E77D7A
oklch(70.7% 0.131 22.6)
-
Step 500
500
#DC5758
oklch(63% 0.167 22.8)
-
Step 600
600 (this color)
#CB3940
oklch(56.5% 0.182 22.8)
-
Step 700
700
#AC2630
oklch(49.1% 0.169 22.6)
-
Step 800
800
#8C2228
oklch(42.7% 0.141 22.7)
-
Step 900
900
#702325
oklch(37.6% 0.109 22.6)
-
Step 950
950
#421616
oklch(27% 0.069 22.8)
#CB3940 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) | #635B3F | 0.197 |
| Deuteranopia (no green cones) | #877B3B | 0.183 |
| Tritanopia (no blue cones) | #DF003D | 0.049 |
| Achromatopsia (no color) | #6F6F6F | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB3940
#CB3940
oklch(56.5% 0.182 22.8)
- #00868F
#00868F
oklch(56.5% 0.096 203.1)
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 #CB3940, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.031
- Faded Red #D3494E ΔE 0.034
- Dusty Red #B9484E ΔE 0.038
- Crimson #DC143C ΔE 0.041
- Cherry #CF0234 ΔE 0.043
- Dark Coral #CF524E ΔE 0.044
- Lipstick #D5174E ΔE 0.045
- Deep Rose #C74767 ΔE 0.049
Use #CB3940 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.