#CB3728
Closest named color: Dull Red (#BB3F3F). oklch(56% 0.187 29.9), rgb(203, 55, 40).
Aa
White text reads best on this color (5.10:1).
About this color
#CB3728 is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.187 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.036 away. White text reads best on it, at 5.10:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.187) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #CB3728 |
| RGB | rgb(203, 55, 40) |
| HSL | hsl(6, 67%, 48%) |
| OKLCH | oklch(56% 0.187 29.9) |
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 #CB3728 | 5.10:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #CB3728 | 4.11:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #CB3728 text on white | 5.10:1 | AA | Lc 73.8 | Content text, not long reading |
| #CB3728 text on black | 4.11:1 | AA large text | Lc -27.9 | 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
#F7CEC7
oklch(88.5% 0.048 29.4)
-
Step 300
300
#F2ADA1
oklch(81% 0.084 30)
-
Step 400
400
#E87E6D
oklch(70.7% 0.134 30.3)
-
Step 500
500
#DE5746
oklch(63.1% 0.172 29.8)
-
Step 600
600 (this color)
#CB3728
oklch(56% 0.187 29.9)
-
Step 700
700
#AE2619
oklch(49.2% 0.174 30)
-
Step 800
800
#8D2218
oklch(42.7% 0.144 29.6)
-
Step 900
900
#71231A
oklch(37.6% 0.112 29.8)
-
Step 950
950
#431610
oklch(27% 0.071 30)
#CB3728 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) | #645925 | 0.198 |
| Deuteranopia (no green cones) | #887A21 | 0.182 |
| Tritanopia (no blue cones) | #E00035 | 0.055 |
| Achromatopsia (no color) | #6E6E6E | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB3728
#CB3728
oklch(56% 0.187 29.9)
- #008394
#008394
oklch(55.9% 0.097 210.6)
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 #CB3728, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.036
- Sinopia #BB3E03 ΔE 0.040
- Brick Orange #C14A09 ΔE 0.043
- Faded Red #D3494E ΔE 0.047
- Cherry #CF0234 ΔE 0.048
- Dusty Red #B9484E ΔE 0.050
- Crimson #DC143C ΔE 0.050
- Burnt Orange #C04E01 ΔE 0.052
Use #CB3728 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.