#B33709
Closest named color: Rusty Red (#AF2F0D). oklch(51.6% 0.167 37.1), rgb(179, 55, 9).
Aa
White text reads best on this color (6.05:1).
About this color
#B33709 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.167 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.017 away. White text reads best on it, at 6.05:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.46:1 |
| White text | 6.05:1 |
Values
| HEX | #B33709 |
| RGB | rgb(179, 55, 9) |
| HSL | hsl(16, 90%, 37%) |
| OKLCH | oklch(51.6% 0.167 37.1) |
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 #B33709 | 6.05:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #B33709 | 3.46:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #B33709 text on white | 6.05:1 | AA | Lc 79.1 | Fine for body text |
| #B33709 text on black | 3.46:1 | AA large text | Lc -22.7 | 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 700.
-
Step 50
50
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F5D0C4
oklch(88.6% 0.045 38.8)
-
Step 300
300
#F0AF9C
oklch(81% 0.081 36.9)
-
Step 400
400
#E58165
oklch(70.7% 0.13 36.5)
-
Step 500
500
#DA5D38
oklch(63.1% 0.166 37)
-
Step 600
600
#C63E0C
oklch(55.7% 0.18 37.1)
-
Step 700
700 (this color)
#B33709
oklch(51.6% 0.167 37.1)
-
Step 800
800
#8A2805
oklch(42.6% 0.139 36.9)
-
Step 900
900
#6F2711
oklch(37.7% 0.108 37)
-
Step 950
950
#41180C
oklch(26.9% 0.067 37)
#B33709 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) | #5D5100 | 0.170 |
| Deuteranopia (no green cones) | #7B6D00 | 0.155 |
| Tritanopia (no blue cones) | #C60230 | 0.068 |
| Achromatopsia (no color) | #626262 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33709
#B33709
oklch(51.6% 0.167 37.1)
- #00748A
#00748A
oklch(51.5% 0.092 217.1)
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 #B33709, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.017
- Sinopia #BB3E03 ΔE 0.023
- Rust Red #AA2704 ΔE 0.034
- Russet #A13905 ΔE 0.036
- Rufous #AE2012 ΔE 0.038
- Firebrick #B22222 ΔE 0.039
- Burnt Umber #A0450E ΔE 0.041
- Brick #A03623 ΔE 0.042
Use #B33709 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.