#B33A1C
Closest named color: Rusty Red (#AF2F0D). oklch(52.1% 0.162 34.7), rgb(179, 58, 28).
Aa
White text reads best on this color (5.93:1).
About this color
#B33A1C is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.162 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.021 away. White text reads best on it, at 5.93:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.162) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.53:1 |
| White text | 5.93:1 |
Values
| HEX | #B33A1C |
| RGB | rgb(179, 58, 28) |
| HSL | hsl(12, 73%, 41%) |
| OKLCH | oklch(52.1% 0.162 34.7) |
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 #B33A1C | 5.93:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #B33A1C | 3.53:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #B33A1C text on white | 5.93:1 | AA | Lc 78.6 | Fine for body text |
| #B33A1C text on black | 3.53:1 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F4D0C6
oklch(88.5% 0.043 36)
-
Step 300
300
#EFAF9F
oklch(81% 0.079 34.5)
-
Step 400
400
#E3826A
oklch(70.7% 0.125 34.8)
-
Step 500
500
#D85E41
oklch(63% 0.16 34.7)
-
Step 600
600
#C4401F
oklch(55.7% 0.174 34.8)
-
Step 700
700 (this color)
#B33A1C
oklch(52.1% 0.162 34.7)
-
Step 800
800
#892A12
oklch(42.7% 0.134 34.9)
-
Step 900
900
#6E2817
oklch(37.7% 0.104 34.9)
-
Step 950
950
#41180E
oklch(27% 0.067 34.9)
#B33A1C 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) | #5E5317 | 0.166 |
| Deuteranopia (no green cones) | #7B6E15 | 0.153 |
| Tritanopia (no blue cones) | #C51134 | 0.062 |
| Achromatopsia (no color) | #646464 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33A1C
#B33A1C
oklch(52.1% 0.162 34.7)
- #00768A
#00768A
oklch(52.1% 0.092 214.9)
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 #B33A1C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.021
- Sinopia #BB3E03 ΔE 0.023
- Firebrick #B22222 ΔE 0.038
- Rust Red #AA2704 ΔE 0.038
- Dull Red #BB3F3F ΔE 0.038
- Russet #A13905 ΔE 0.040
- Rufous #AE2012 ΔE 0.040
- Brick #A03623 ΔE 0.041
Use #B33A1C 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.