#B03231
Closest named color: Firebrick (#B22222). oklch(50.9% 0.163 25.5), rgb(176, 50, 49).
Aa
White text reads best on this color (6.27:1).
About this color
#B03231 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.163 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.021 away. White text reads best on it, at 6.27:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.163) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.34:1 |
| White text | 6.27:1 |
Values
| HEX | #B03231 |
| RGB | rgb(176, 50, 49) |
| HSL | hsl(0, 56%, 44%) |
| OKLCH | oklch(50.9% 0.163 25.5) |
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 #B03231 | 6.27:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #B03231 | 3.34:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #B03231 text on white | 6.27:1 | AA | Lc 80.1 | Fine for body text |
| #B03231 text on black | 3.34:1 | AA large text | Lc -21.7 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#F9E4E2
oklch(93.5% 0.023 24.1)
-
Step 200
200
#F5CFCA
oklch(88.5% 0.044 26.8)
-
Step 300
300
#EFADA7
oklch(80.8% 0.079 24.8)
-
Step 400
400
#E57F77
oklch(70.7% 0.127 25.5)
-
Step 500
500
#DA5B55
oklch(63.2% 0.161 25.5)
-
Step 600
600
#C53B39
oklch(55.6% 0.175 25.6)
-
Step 700
700 (this color)
#B03231
oklch(50.9% 0.163 25.5)
-
Step 800
800
#8A2625
oklch(42.7% 0.135 25.5)
-
Step 900
900
#6F2523
oklch(37.7% 0.106 25.1)
-
Step 950
950
#411715
oklch(26.9% 0.066 25.2)
#B03231 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) | #564F30 | 0.175 |
| Deuteranopia (no green cones) | #766A2D | 0.160 |
| Tritanopia (no blue cones) | #C20133 | 0.048 |
| Achromatopsia (no color) | #606060 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03231
#B03231
oklch(50.9% 0.163 25.5)
- #00747E
#00747E
oklch(51% 0.087 205.3)
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 #B03231, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.021
- Rusty Red #AF2F0D ΔE 0.028
- Brown #A52A2A ΔE 0.029
- Rufous #AE2012 ΔE 0.031
- Dull Red #BB3F3F ΔE 0.036
- Rust Red #AA2704 ΔE 0.036
- Brick #A03623 ΔE 0.036
- Scarlet #BE0119 ΔE 0.042
Use #B03231 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.