#B33D1F
Closest named color: Sinopia (#BB3E03). oklch(52.5% 0.159 35.1), rgb(179, 61, 31).
Aa
White text reads best on this color (5.82:1).
About this color
#B33D1F is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.159 and its hue 35°. 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 5.82:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.159) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.60:1 |
| White text | 5.82:1 |
Values
| HEX | #B33D1F |
| RGB | rgb(179, 61, 31) |
| HSL | hsl(12, 70%, 41%) |
| OKLCH | oklch(52.5% 0.159 35.1) |
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 #B33D1F | 5.82:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #B33D1F | 3.60:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #B33D1F text on white | 5.82:1 | AA | Lc 78.2 | Fine for body text |
| #B33D1F text on black | 3.60:1 | AA large text | Lc -23.6 | 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
#EBB1A2
oklch(81% 0.071 35)
-
Step 400
400
#DE856F
oklch(70.6% 0.115 34.7)
-
Step 500
500
#D26448
oklch(63.1% 0.146 35.4)
-
Step 600
600 (this color)
#B33D1F
oklch(52.5% 0.159 35.1)
-
Step 700
700
#A3381C
oklch(49.1% 0.147 35.3)
-
Step 800
800
#852F1A
oklch(42.8% 0.123 34.9)
-
Step 900
900
#6B2B1B
oklch(37.7% 0.096 35.2)
-
Step 950
950
#3F1A11
oklch(27% 0.06 34.9)
#B33D1F 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) | #5F541A | 0.163 |
| Deuteranopia (no green cones) | #7C6F19 | 0.149 |
| Tritanopia (no blue cones) | #C51A37 | 0.062 |
| Achromatopsia (no color) | #656565 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33D1F
#B33D1F
oklch(52.5% 0.159 35.1)
- #00778C
#00778C
oklch(52.4% 0.093 215.7)
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 #B33D1F, 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 0.026
- Dull Red #BB3F3F ΔE 0.036
- Russet #A13905 ΔE 0.041
- Burnt Umber #A0450E ΔE 0.042
- Firebrick #B22222 ΔE 0.042
- Rust Red #AA2704 ΔE 0.043
- Cinnamon #AC4F06 ΔE 0.043
Use #B33D1F 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.