#B33018
Closest named color: Rusty Red (#AF2F0D). oklch(51% 0.171 32.5), rgb(179, 48, 24).
Aa
White text reads best on this color (6.26:1).
About this color
#B33018 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.171 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.011 away. White text reads best on it, at 6.26:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.35:1 |
| White text | 6.26:1 |
Values
| HEX | #B33018 |
| RGB | rgb(179, 48, 24) |
| HSL | hsl(9, 76%, 40%) |
| OKLCH | oklch(51% 0.171 32.5) |
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 #B33018 | 6.26:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #B33018 | 3.35:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #B33018 text on white | 6.26:1 | AA | Lc 79.9 | Fine for body text |
| #B33018 text on black | 3.35:1 | AA large text | Lc -21.9 | 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 700.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#F9E4E0
oklch(93.5% 0.024 30.5)
-
Step 200
200
#F6CFC6
oklch(88.5% 0.046 33.2)
-
Step 300
300
#F1AD9F
oklch(80.8% 0.083 31.9)
-
Step 400
400
#E77F6A
oklch(70.7% 0.133 32.5)
-
Step 500
500
#DD5941
oklch(63.1% 0.17 32.3)
-
Step 600
600
#C8391F
oklch(55.6% 0.184 32.5)
-
Step 700
700 (this color)
#B33018
oklch(51% 0.171 32.5)
-
Step 800
800
#8C2512
oklch(42.7% 0.142 32.6)
-
Step 900
900
#712517
oklch(37.8% 0.11 32.6)
-
Step 950
950
#42170E
oklch(27% 0.069 33.5)
#B33018 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) | #584E13 | 0.181 |
| Deuteranopia (no green cones) | #786B0F | 0.164 |
| Tritanopia (no blue cones) | #C6002C | 0.054 |
| Achromatopsia (no color) | #606060 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33018
#B33018
oklch(51% 0.171 32.5)
- #007384
#007384
oklch(51% 0.089 212.5)
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 #B33018, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.011
- Firebrick #B22222 ΔE 0.023
- Rufous #AE2012 ΔE 0.025
- Rust Red #AA2704 ΔE 0.026
- Sinopia #BB3E03 ΔE 0.034
- Brick #A03623 ΔE 0.037
- Brown #A52A2A ΔE 0.037
- Russet #A13905 ΔE 0.040
Use #B33018 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.