#B23F37
Closest named color: Dull Red (#BB3F3F). oklch(52.8% 0.151 27.4), rgb(178, 63, 55).
Aa
White text reads best on this color (5.73:1).
About this color
#B23F37 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.151 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.020 away. White text reads best on it, at 5.73:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.151) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.65:1 |
| White text | 5.73:1 |
Values
| HEX | #B23F37 |
| RGB | rgb(178, 63, 55) |
| HSL | hsl(4, 53%, 46%) |
| OKLCH | oklch(52.8% 0.151 27.4) |
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 #B23F37 | 5.73:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #B23F37 | 3.65:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #B23F37 text on white | 5.73:1 | AA | Lc 77.8 | Fine for body text |
| #B23F37 text on black | 3.65:1 | AA large text | Lc -24.0 | 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 600.
-
Step 50
50
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F7E5E3
oklch(93.6% 0.02 25.2)
-
Step 200
200
#F1D0CC
oklch(88.4% 0.038 26.1)
-
Step 300
300
#EAB0A9
oklch(80.9% 0.069 26.5)
-
Step 400
400
#DC857B
oklch(70.6% 0.109 27.2)
-
Step 500
500
#D06459
oklch(63.1% 0.139 27.6)
-
Step 600
600 (this color)
#B23F37
oklch(52.8% 0.151 27.4)
-
Step 700
700
#A13831
oklch(49% 0.141 27.3)
-
Step 800
800
#833029
oklch(42.8% 0.116 27.8)
-
Step 900
900
#6A2B26
oklch(37.7% 0.092 26.9)
-
Step 950
950
#3E1A16
oklch(27% 0.057 28)
#B23F37 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) | #5E5635 | 0.160 |
| Deuteranopia (no green cones) | #7B6F34 | 0.146 |
| Tritanopia (no blue cones) | #C3233E | 0.049 |
| Achromatopsia (no color) | #666666 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B23F37
#B23F37
oklch(52.8% 0.151 27.4)
- #007986
#007986
oklch(52.7% 0.091 207.9)
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 #B23F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.020
- Dusty Red #B9484E ΔE 0.033
- Rusty Red #AF2F0D ΔE 0.038
- Sinopia #BB3E03 ΔE 0.039
- Firebrick #B22222 ΔE 0.042
- Brick #A03623 ΔE 0.046
- Brown #A52A2A ΔE 0.049
- Light Maroon #A24857 ΔE 0.049
Use #B23F37 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.