#B03133
Closest named color: Firebrick (#B22222). oklch(50.8% 0.164 24.4), rgb(176, 49, 51).
Aa
White text reads best on this color (6.30:1).
About this color
#B03133 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.164 and its hue 24°. 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 6.30:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.164) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.33:1 |
| White text | 6.30:1 |
Values
| HEX | #B03133 |
| RGB | rgb(176, 49, 51) |
| HSL | hsl(359, 56%, 44%) |
| OKLCH | oklch(50.8% 0.164 24.4) |
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 #B03133 | 6.30:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #B03133 | 3.33:1 | AA large text | Lc 23.9 | Dividers and decoration only |
| #B03133 text on white | 6.30:1 | AA | Lc 80.2 | Fine for body text |
| #B03133 text on black | 3.33:1 | 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
#F5CFCB
oklch(88.6% 0.043 25.1)
-
Step 300
300
#F0ADA7
oklch(80.9% 0.08 24.7)
-
Step 400
400
#E57F79
oklch(70.7% 0.127 24.3)
-
Step 500
500
#DA5A57
oklch(63.1% 0.162 24.2)
-
Step 600
600
#C53A3C
oklch(55.5% 0.176 24.2)
-
Step 700
700 (this color)
#B03133
oklch(50.8% 0.164 24.4)
-
Step 800
800
#8A2627
oklch(42.7% 0.135 24.4)
-
Step 900
900
#6F2524
oklch(37.7% 0.105 24.4)
-
Step 950
950
#411715
oklch(26.9% 0.066 25.2)
#B03133 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) | #554E32 | 0.177 |
| Deuteranopia (no green cones) | #756A2F | 0.162 |
| Tritanopia (no blue cones) | #C20033 | 0.047 |
| Achromatopsia (no color) | #606060 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03133
#B03133
oklch(50.8% 0.164 24.4)
- #00747D
#00747D
oklch(51% 0.087 204.3)
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 #B03133, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.021
- Brown #A52A2A ΔE 0.028
- Rusty Red #AF2F0D ΔE 0.031
- Rufous #AE2012 ΔE 0.032
- Dull Red #BB3F3F ΔE 0.036
- Brick #A03623 ΔE 0.038
- Rust Red #AA2704 ΔE 0.038
- Scarlet #BE0119 ΔE 0.042
Use #B03133 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.