#B03143
Closest named color: Firebrick (#B22222). oklch(51.1% 0.163 17.3), rgb(176, 49, 67).
Aa
White text reads best on this color (6.23:1).
About this color
#B03143 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.163 and its hue 17°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.036 away. White text reads best on it, at 6.23:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.163) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.36:1 |
| White text | 6.23:1 |
Values
| HEX | #B03143 |
| RGB | rgb(176, 49, 67) |
| HSL | hsl(351, 56%, 44%) |
| OKLCH | oklch(51.1% 0.163 17.3) |
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 #B03143 | 6.23:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #B03143 | 3.36:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #B03143 text on white | 6.23:1 | AA | Lc 79.9 | Fine for body text |
| #B03143 text on black | 3.36:1 | AA large text | Lc -21.9 | 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 700.
-
Step 50
50
#FCF3F3
oklch(97.1% 0.01 17.3)
-
Step 100
100
#F9E4E4
oklch(93.6% 0.023 17.6)
-
Step 200
200
#F5CECF
oklch(88.5% 0.044 16.3)
-
Step 300
300
#EFACAE
oklch(80.8% 0.079 17)
-
Step 400
400
#E47E84
oklch(70.7% 0.126 17.1)
-
Step 500
500
#D95965
oklch(63.1% 0.161 17.3)
-
Step 600
600
#C4394C
oklch(55.5% 0.175 17.4)
-
Step 700
700 (this color)
#B03143
oklch(51.1% 0.163 17.3)
-
Step 800
800
#892533
oklch(42.7% 0.134 17.2)
-
Step 900
900
#6F242D
oklch(37.7% 0.106 16.8)
-
Step 950
950
#41161A
oklch(26.9% 0.067 17.2)
#B03143 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) | #535043 | 0.179 |
| Deuteranopia (no green cones) | #746A40 | 0.163 |
| Tritanopia (no blue cones) | #C10939 | 0.041 |
| Achromatopsia (no color) | #616161 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03143
#B03143
oklch(51.1% 0.163 17.3)
- #007578
#007578
oklch(51% 0.087 197.9)
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 #B03143, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.036
- Light Burgundy #A8415B ΔE 0.038
- Dull Red #BB3F3F ΔE 0.038
- Brown #A52A2A ΔE 0.039
- Rouge #AB1239 ΔE 0.039
- Rose Red #BE013C ΔE 0.041
- Lipstick Red #C0022F ΔE 0.043
- Light Maroon #A24857 ΔE 0.046
Use #B03143 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.