#CB3537
Closest named color: Dull Red (#BB3F3F). oklch(56% 0.187 25), rgb(203, 53, 55).
Aa
White text reads best on this color (5.11:1).
About this color
#CB3537 is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.187 and its hue 25°. 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 5.11:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.187) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 4.10:1 |
| White text | 5.11:1 |
Values
| HEX | #CB3537 |
| RGB | rgb(203, 53, 55) |
| HSL | hsl(359, 59%, 50%) |
| OKLCH | oklch(56% 0.187 25) |
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 #CB3537 | 5.11:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #CB3537 | 4.10:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #CB3537 text on white | 5.11:1 | AA | Lc 73.9 | Content text, not long reading |
| #CB3537 text on black | 4.10:1 | AA large text | Lc -27.8 | 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
#F7CECA
oklch(88.5% 0.047 24.6)
-
Step 300
300
#F2ACA5
oklch(80.9% 0.084 25.5)
-
Step 400
400
#E87C75
oklch(70.6% 0.135 24.9)
-
Step 500
500
#DE5652
oklch(63.1% 0.171 25)
-
Step 600
600 (this color)
#CB3537
oklch(56% 0.187 25)
-
Step 700
700
#AE2428
oklch(49.2% 0.174 25.2)
-
Step 800
800
#8D2123
oklch(42.7% 0.144 24.9)
-
Step 900
900
#712221
oklch(37.6% 0.112 24.9)
-
Step 950
950
#431514
oklch(27% 0.072 24.4)
#CB3537 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) | #615935 | 0.203 |
| Deuteranopia (no green cones) | #877A32 | 0.185 |
| Tritanopia (no blue cones) | #DF0038 | 0.047 |
| Achromatopsia (no color) | #6E6E6E | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB3537
#CB3537
oklch(56% 0.187 25)
- #00848F
#00848F
oklch(56% 0.096 205.1)
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 #CB3537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.031
- Cherry #CF0234 ΔE 0.039
- Crimson #DC143C ΔE 0.041
- Faded Red #D3494E ΔE 0.041
- Dusty Red #B9484E ΔE 0.043
- Lipstick #D5174E ΔE 0.049
- Dark Coral #CF524E ΔE 0.050
- Sinopia #BB3E03 ΔE 0.052
Use #CB3537 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.