#B33D23
Closest named color: Sinopia (#BB3E03). oklch(52.5% 0.158 33.9), rgb(179, 61, 35).
Aa
White text reads best on this color (5.81:1).
About this color
#B33D23 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.158 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.023 away. White text reads best on it, at 5.81:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.158) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.60:1 |
| White text | 5.81:1 |
Values
| HEX | #B33D23 |
| RGB | rgb(179, 61, 35) |
| HSL | hsl(11, 67%, 42%) |
| OKLCH | oklch(52.5% 0.158 33.9) |
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 #B33D23 | 5.81:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #B33D23 | 3.60:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #B33D23 text on white | 5.81:1 | AA | Lc 78.1 | Fine for body text |
| #B33D23 text on black | 3.60:1 | AA large text | Lc -23.7 | 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
#F7E5E1
oklch(93.5% 0.021 32.5)
-
Step 200
200
#F2D0C8
oklch(88.4% 0.04 33.4)
-
Step 300
300
#EBB1A3
oklch(81% 0.071 34)
-
Step 400
400
#DE8571
oklch(70.7% 0.114 33.5)
-
Step 500
500
#D2644B
oklch(63.1% 0.145 34.1)
-
Step 600
600 (this color)
#B33D23
oklch(52.5% 0.158 33.9)
-
Step 700
700
#A33720
oklch(49% 0.147 33.7)
-
Step 800
800
#852F1C
oklch(42.8% 0.122 34)
-
Step 900
900
#6B2B1D
oklch(37.7% 0.095 33.8)
-
Step 950
950
#3F1A12
oklch(27.1% 0.06 33.5)
#B33D23 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) | #5F551F | 0.163 |
| Deuteranopia (no green cones) | #7C6F1E | 0.149 |
| Tritanopia (no blue cones) | #C51A38 | 0.061 |
| Achromatopsia (no color) | #656565 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33D23
#B33D23
oklch(52.5% 0.158 33.9)
- #00778B
#00778B
oklch(52.4% 0.092 214.8)
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 #B33D23, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.023
- Rusty Red #AF2F0D ΔE 0.027
- Dull Red #BB3F3F ΔE 0.033
- Firebrick #B22222 ΔE 0.041
- Russet #A13905 ΔE 0.043
- Rust Red #AA2704 ΔE 0.043
- Brick #A03623 ΔE 0.043
- Burnt Umber #A0450E ΔE 0.043
Use #B33D23 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.