#B33B1A
Closest named color: Sinopia (#BB3E03). oklch(52.2% 0.162 35.6), rgb(179, 59, 26).
Aa
White text reads best on this color (5.90:1).
About this color
#B33B1A is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.162 and its hue 36°. 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 5.90:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.162) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.55:1 |
| White text | 5.90:1 |
Values
| HEX | #B33B1A |
| RGB | rgb(179, 59, 26) |
| HSL | hsl(13, 75%, 40%) |
| OKLCH | oklch(52.2% 0.162 35.6) |
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 #B33B1A | 5.90:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #B33B1A | 3.55:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #B33B1A text on white | 5.90:1 | AA | Lc 78.5 | Fine for body text |
| #B33B1A text on black | 3.55:1 | AA large text | Lc -23.3 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F8E5E0
oklch(93.6% 0.022 35.1)
-
Step 200
200
#F4D0C6
oklch(88.5% 0.043 36)
-
Step 300
300
#EEAF9E
oklch(80.8% 0.078 35.7)
-
Step 400
400
#E38269
oklch(70.6% 0.126 35.4)
-
Step 500
500
#D85F3F
oklch(63.1% 0.16 35.8)
-
Step 600
600
#C4401C
oklch(55.6% 0.175 35.4)
-
Step 700
700 (this color)
#B33B1A
oklch(52.2% 0.162 35.6)
-
Step 800
800
#892A10
oklch(42.7% 0.134 35.4)
-
Step 900
900
#6E2816
oklch(37.7% 0.104 35.4)
-
Step 950
950
#41180E
oklch(27% 0.067 34.9)
#B33B1A 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) | #5E5314 | 0.166 |
| Deuteranopia (no green cones) | #7C6E13 | 0.150 |
| Tritanopia (no blue cones) | #C51435 | 0.064 |
| Achromatopsia (no color) | #646464 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33B1A
#B33B1A
oklch(52.2% 0.162 35.6)
- #00768B
#00768B
oklch(52.1% 0.092 215.8)
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 #B33B1A, 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
- Dull Red #BB3F3F ΔE 0.039
- Rust Red #AA2704 ΔE 0.039
- Russet #A13905 ΔE 0.039
- Firebrick #B22222 ΔE 0.040
- Burnt Umber #A0450E ΔE 0.041
- Brick #A03623 ΔE 0.042
Use #B33B1A 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.