#B33F18
Closest named color: Sinopia (#BB3E03). oklch(52.6% 0.159 37.5), rgb(179, 63, 24).
Aa
White text reads best on this color (5.76:1).
About this color
#B33F18 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.159 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.017 away. White text reads best on it, at 5.76:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.159) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.64:1 |
| White text | 5.76:1 |
Values
| HEX | #B33F18 |
| RGB | rgb(179, 63, 24) |
| HSL | hsl(15, 76%, 40%) |
| OKLCH | oklch(52.6% 0.159 37.5) |
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 #B33F18 | 5.76:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #B33F18 | 3.64:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #B33F18 text on white | 5.76:1 | AA | Lc 77.9 | Fine for body text |
| #B33F18 text on black | 3.64:1 | AA large text | Lc -23.9 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F7E5E0
oklch(93.5% 0.021 36)
-
Step 200
200
#F2D1C7
oklch(88.6% 0.04 37.5)
-
Step 300
300
#EAB1A0
oklch(80.8% 0.071 37.3)
-
Step 400
400
#DD866C
oklch(70.6% 0.114 37.4)
-
Step 500
500
#D26544
oklch(63.2% 0.146 37.5)
-
Step 600
600 (this color)
#B33F18
oklch(52.6% 0.159 37.5)
-
Step 700
700
#A33915
oklch(49.2% 0.148 37.6)
-
Step 800
800
#843015
oklch(42.7% 0.122 37.5)
-
Step 900
900
#6A2C19
oklch(37.7% 0.094 37.6)
-
Step 950
950
#3F1A0F
oklch(27% 0.061 37.3)
#B33F18 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) | #615511 | 0.160 |
| Deuteranopia (no green cones) | #7D6F11 | 0.145 |
| Tritanopia (no blue cones) | #C51D38 | 0.067 |
| Achromatopsia (no color) | #666666 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33F18
#B33F18
oklch(52.6% 0.159 37.5)
- #00778E
#00778E
oklch(52.5% 0.094 217.5)
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 #B33F18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.017
- Rusty Red #AF2F0D ΔE 0.029
- Cinnamon #AC4F06 ΔE 0.037
- Burnt Umber #A0450E ΔE 0.039
- Brick Orange #C14A09 ΔE 0.039
- Dull Red #BB3F3F ΔE 0.041
- Russet #A13905 ΔE 0.041
- Burnt Siena #B75203 ΔE 0.044
Use #B33F18 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.