#B23C03
Closest named color: Sinopia (#BB3E03). oklch(52% 0.163 39.6), rgb(178, 60, 3).
Aa
White text reads best on this color (5.93:1).
About this color
#B23C03 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.163 and its hue 40°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.019 away. White text reads best on it, at 5.93:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.163) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.54:1 |
| White text | 5.93:1 |
Values
| HEX | #B23C03 |
| RGB | rgb(178, 60, 3) |
| HSL | hsl(20, 97%, 35%) |
| OKLCH | oklch(52% 0.163 39.6) |
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 #B23C03 | 5.93:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #B23C03 | 3.54:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #B23C03 text on white | 5.93:1 | AA | Lc 78.6 | Fine for body text |
| #B23C03 text on black | 3.54:1 | AA large text | Lc -23.2 | 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
#F4D0C4
oklch(88.5% 0.044 39.3)
-
Step 300
300
#EEB09B
oklch(81% 0.079 39.5)
-
Step 400
400
#E28363
oklch(70.6% 0.126 39.3)
-
Step 500
500
#D86035
oklch(63.1% 0.162 39.4)
-
Step 600
600
#C34201
oklch(55.6% 0.175 39.7)
-
Step 700
700 (this color)
#B23C03
oklch(52% 0.163 39.6)
-
Step 800
800
#882B00
oklch(42.6% 0.135 39.6)
-
Step 900
900
#6E290E
oklch(37.8% 0.105 39.9)
-
Step 950
950
#41190B
oklch(27.1% 0.067 39.3)
#B23C03 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) | #5F5300 | 0.162 |
| Deuteranopia (no green cones) | #7C6E00 | 0.147 |
| Tritanopia (no blue cones) | #C51533 | 0.071 |
| Achromatopsia (no color) | #646464 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B23C03
#B23C03
oklch(52% 0.163 39.6)
- #00758E
#00758E
oklch(52% 0.094 219.6)
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 #B23C03, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.019
- Rusty Red #AF2F0D ΔE 0.025
- Burnt Umber #A0450E ΔE 0.036
- Russet #A13905 ΔE 0.036
- Cinnamon #AC4F06 ΔE 0.038
- Rust Red #AA2704 ΔE 0.041
- Brick Orange #C14A09 ΔE 0.043
- Brick #A03623 ΔE 0.045
Use #B23C03 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.