#CB3129
Closest named color: Dull Red (#BB3F3F). oklch(55.5% 0.192 28.3), rgb(203, 49, 41).
Aa
White text reads best on this color (5.23:1).
About this color
#CB3129 is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.192 and its hue 28°. 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 5.23:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.192) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 4.01:1 |
| White text | 5.23:1 |
Values
| HEX | #CB3129 |
| RGB | rgb(203, 49, 41) |
| HSL | hsl(3, 66%, 48%) |
| OKLCH | oklch(55.5% 0.192 28.3) |
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 #CB3129 | 5.23:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #CB3129 | 4.01:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #CB3129 text on white | 5.23:1 | AA | Lc 74.5 | Content text, not long reading |
| #CB3129 text on black | 4.01:1 | AA large text | Lc -27.2 | 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
#FAE4E1
oklch(93.6% 0.025 26.9)
-
Step 200
200
#F7CEC8
oklch(88.5% 0.047 27.8)
-
Step 300
300
#F3ACA1
oklch(80.9% 0.086 28.9)
-
Step 400
400
#EA7C6F
oklch(70.7% 0.138 28.1)
-
Step 500
500
#E05548
oklch(63.1% 0.176 28.4)
-
Step 600
600 (this color)
#CB3129
oklch(55.5% 0.192 28.3)
-
Step 700
700
#AF211C
oklch(49% 0.178 28.2)
-
Step 800
800
#8E1F1A
oklch(42.6% 0.147 28)
-
Step 900
900
#72211B
oklch(37.6% 0.115 28.1)
-
Step 950
950
#431511
oklch(26.9% 0.072 27.9)
#CB3129 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) | #615726 | 0.206 |
| Deuteranopia (no green cones) | #877822 | 0.186 |
| Tritanopia (no blue cones) | #E00031 | 0.048 |
| Achromatopsia (no color) | #6C6C6C | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB3129
#CB3129
oklch(55.5% 0.192 28.3)
- #008290
#008290
oklch(55.5% 0.095 208)
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 #CB3129, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.036
- Cherry #CF0234 ΔE 0.040
- Sinopia #BB3E03 ΔE 0.044
- Crimson #DC143C ΔE 0.045
- Faded Red #D3494E ΔE 0.051
- Brick Orange #C14A09 ΔE 0.051
- Dusty Red #B9484E ΔE 0.051
- Scarlet #BE0119 ΔE 0.052
Use #CB3129 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.