#B03643
Closest named color: Dull Red (#BB3F3F). oklch(51.6% 0.157 18.7), rgb(176, 54, 67).
Aa
White text reads best on this color (6.07:1).
About this color
#B03643 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.157 and its hue 19°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.032 away. White text reads best on it, at 6.07:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.157) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #B03643 |
| RGB | rgb(176, 54, 67) |
| HSL | hsl(354, 53%, 45%) |
| OKLCH | oklch(51.6% 0.157 18.7) |
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 #B03643 | 6.07:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #B03643 | 3.45:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #B03643 text on white | 6.07:1 | AA | Lc 79.3 | Fine for body text |
| #B03643 text on black | 3.45:1 | AA large text | Lc -22.5 | 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 700.
-
Step 50
50
#FCF3F3
oklch(97.1% 0.01 17.3)
-
Step 100
100
#F8E4E4
oklch(93.5% 0.022 17.6)
-
Step 200
200
#F4CFCE
oklch(88.6% 0.042 19.8)
-
Step 300
300
#EEADAD
oklch(80.8% 0.077 18.9)
-
Step 400
400
#E28083
oklch(70.7% 0.121 18.7)
-
Step 500
500
#D75B64
oklch(63% 0.156 18.4)
-
Step 600
600
#C23D4B
oklch(55.6% 0.169 18.7)
-
Step 700
700 (this color)
#B03643
oklch(51.6% 0.157 18.7)
-
Step 800
800
#882832
oklch(42.8% 0.13 18.7)
-
Step 900
900
#6D262C
oklch(37.6% 0.101 18.4)
-
Step 950
950
#40171A
oklch(26.9% 0.064 18)
#B03643 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) | #565243 | 0.172 |
| Deuteranopia (no green cones) | #756C40 | 0.159 |
| Tritanopia (no blue cones) | #C1173C | 0.041 |
| Achromatopsia (no color) | #626262 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03643
#B03643
oklch(51.6% 0.157 18.7)
- #00777B
#00777B
oklch(51.7% 0.088 198.9)
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 #B03643, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.032
- Light Burgundy #A8415B ΔE 0.035
- Firebrick #B22222 ΔE 0.038
- Dusty Red #B9484E ΔE 0.040
- Brown #A52A2A ΔE 0.041
- Light Maroon #A24857 ΔE 0.041
- Dark Rose #B5485D ΔE 0.043
- Rouge #AB1239 ΔE 0.047
Use #B03643 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.