#B23631
Closest named color: Firebrick (#B22222). oklch(51.7% 0.161 26.7), rgb(178, 54, 49).
Aa
White text reads best on this color (6.06:1).
About this color
#B23631 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.161 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.027 away. White text reads best on it, at 6.06:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.161) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.46:1 |
| White text | 6.06:1 |
Values
| HEX | #B23631 |
| RGB | rgb(178, 54, 49) |
| HSL | hsl(2, 57%, 45%) |
| OKLCH | oklch(51.7% 0.161 26.7) |
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 #B23631 | 6.06:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #B23631 | 3.46:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #B23631 text on white | 6.06:1 | AA | Lc 79.2 | Fine for body text |
| #B23631 text on black | 3.46:1 | AA large text | Lc -22.6 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F9E5E2
oklch(93.7% 0.022 27.8)
-
Step 200
200
#F5CFCA
oklch(88.5% 0.044 26.8)
-
Step 300
300
#EFAEA6
oklch(81% 0.078 26.8)
-
Step 400
400
#E48076
oklch(70.7% 0.125 26.7)
-
Step 500
500
#D95C53
oklch(63.2% 0.159 26.7)
-
Step 600
600
#C43D37
oklch(55.6% 0.173 26.9)
-
Step 700
700 (this color)
#B23631
oklch(51.7% 0.161 26.7)
-
Step 800
800
#892724
oklch(42.6% 0.133 26.3)
-
Step 900
900
#6F2622
oklch(37.8% 0.105 26.4)
-
Step 950
950
#411714
oklch(26.9% 0.066 26.5)
#B23631 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) | #59512F | 0.173 |
| Deuteranopia (no green cones) | #786C2D | 0.157 |
| Tritanopia (no blue cones) | #C40D36 | 0.050 |
| Achromatopsia (no color) | #626262 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B23631
#B23631
oklch(51.7% 0.161 26.7)
- #007682
#007682
oklch(51.7% 0.089 207.2)
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 #B23631, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.027
- Dull Red #BB3F3F ΔE 0.028
- Rusty Red #AF2F0D ΔE 0.029
- Brown #A52A2A ΔE 0.036
- Rufous #AE2012 ΔE 0.037
- Brick #A03623 ΔE 0.040
- Rust Red #AA2704 ΔE 0.040
- Sinopia #BB3E03 ΔE 0.043
Use #B23631 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.