#B23B10
Closest named color: Sinopia (#BB3E03). oklch(51.9% 0.162 37.6), rgb(178, 59, 16).
Aa
White text reads best on this color (5.95:1).
About this color
#B23B10 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.162 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.021 away. White text reads best on it, at 5.95:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.162) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.52:1 |
| White text | 5.95:1 |
Values
| HEX | #B23B10 |
| RGB | rgb(178, 59, 16) |
| HSL | hsl(16, 84%, 38%) |
| OKLCH | oklch(51.9% 0.162 37.6) |
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 #B23B10 | 5.95:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #B23B10 | 3.52:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #B23B10 text on white | 5.95:1 | AA | Lc 78.7 | Fine for body text |
| #B23B10 text on black | 3.52:1 | AA large text | Lc -23.1 | 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
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F8E5DF
oklch(93.5% 0.022 38.3)
-
Step 200
200
#F4D0C5
oklch(88.5% 0.043 37.7)
-
Step 300
300
#EEAF9C
oklch(80.8% 0.079 37.5)
-
Step 400
400
#E38366
oklch(70.8% 0.126 37.6)
-
Step 500
500
#D85F3A
oklch(63.1% 0.161 37.5)
-
Step 600
600
#C34112
oklch(55.5% 0.174 37.5)
-
Step 700
700 (this color)
#B23B10
oklch(51.9% 0.162 37.6)
-
Step 800
800
#892B08
oklch(42.8% 0.135 37.7)
-
Step 900
900
#6E2812
oklch(37.7% 0.105 37.4)
-
Step 950
950
#41190C
oklch(27.1% 0.066 38.3)
#B23B10 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) | #5E5305 | 0.165 |
| Deuteranopia (no green cones) | #7C6D05 | 0.148 |
| Tritanopia (no blue cones) | #C41334 | 0.068 |
| Achromatopsia (no color) | #646464 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B23B10
#B23B10
oklch(51.9% 0.162 37.6)
- #00758C
#00758C
oklch(51.9% 0.093 217.8)
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 #B23B10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.021
- Rusty Red #AF2F0D ΔE 0.022
- Russet #A13905 ΔE 0.036
- Burnt Umber #A0450E ΔE 0.038
- Rust Red #AA2704 ΔE 0.038
- Cinnamon #AC4F06 ΔE 0.041
- Brick #A03623 ΔE 0.042
- Firebrick #B22222 ΔE 0.043
Use #B23B10 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.