#B23137
Closest named color: Firebrick (#B22222). oklch(51.3% 0.165 22.8), rgb(178, 49, 55).
Aa
White text reads best on this color (6.19:1).
About this color
#B23137 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.165 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.025 away. White text reads best on it, at 6.19:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.165) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.38:1 |
| White text | 6.19:1 |
Values
| HEX | #B23137 |
| RGB | rgb(178, 49, 55) |
| HSL | hsl(357, 57%, 45%) |
| OKLCH | oklch(51.3% 0.165 22.8) |
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 #B23137 | 6.19:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #B23137 | 3.38:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #B23137 text on white | 6.19:1 | AA | Lc 79.7 | Fine for body text |
| #B23137 text on black | 3.38:1 | AA large text | Lc -22.1 | 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
#F9E4E3
oklch(93.5% 0.023 20.9)
-
Step 200
200
#F5CECC
oklch(88.4% 0.044 21.5)
-
Step 300
300
#F0ADA9
oklch(81% 0.079 22.8)
-
Step 400
400
#E57E7B
oklch(70.6% 0.128 22.6)
-
Step 500
500
#DB5959
oklch(63.2% 0.164 23)
-
Step 600
600
#C6393F
oklch(55.6% 0.177 22.9)
-
Step 700
700 (this color)
#B23137
oklch(51.3% 0.165 22.8)
-
Step 800
800
#8B2529
oklch(42.8% 0.137 23.1)
-
Step 900
900
#6F2426
oklch(37.6% 0.106 22.3)
-
Step 950
950
#421616
oklch(27% 0.069 22.8)
#B23137 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) | #564F36 | 0.179 |
| Deuteranopia (no green cones) | #766B33 | 0.165 |
| Tritanopia (no blue cones) | #C40034 | 0.045 |
| Achromatopsia (no color) | #616161 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B23137
#B23137
oklch(51.3% 0.165 22.8)
- #00757D
#00757D
oklch(51.2% 0.087 203.1)
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 #B23137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.025
- Dull Red #BB3F3F ΔE 0.032
- Brown #A52A2A ΔE 0.033
- Rusty Red #AF2F0D ΔE 0.036
- Rufous #AE2012 ΔE 0.037
- Lipstick Red #C0022F ΔE 0.040
- Scarlet #BE0119 ΔE 0.042
- Brick #A03623 ΔE 0.044
Use #B23137 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.