#B33100
Closest named color: Rusty Red (#AF2F0D). oklch(51% 0.173 36.3), rgb(179, 49, 0).
Aa
White text reads best on this color (6.25:1).
About this color
#B33100 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.173 and its hue 36°. 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 6.25:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.173) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.35:1 |
| White text | 6.25:1 |
Values
| HEX | #B33100 |
| RGB | rgb(179, 49, 0) |
| HSL | hsl(16, 100%, 35%) |
| OKLCH | oklch(51% 0.173 36.3) |
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 #B33100 | 6.25:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #B33100 | 3.35:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #B33100 text on white | 6.25:1 | AA | Lc 79.8 | Fine for body text |
| #B33100 text on black | 3.35:1 | AA large text | Lc -22.0 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F6CFC4
oklch(88.5% 0.047 36.3)
-
Step 300
300
#F1AE9B
oklch(80.9% 0.084 36.5)
-
Step 400
400
#E78063
oklch(70.7% 0.134 36.6)
-
Step 500
500
#DD5A36
oklch(63.1% 0.172 36.1)
-
Step 600
600
#C83A06
oklch(55.6% 0.186 36.3)
-
Step 700
700 (this color)
#B33100
oklch(51% 0.173 36.3)
-
Step 800
800
#8C2502
oklch(42.6% 0.144 36.2)
-
Step 900
900
#71250F
oklch(37.7% 0.112 36.3)
-
Step 950
950
#42170B
oklch(26.9% 0.07 36.4)
#B33100 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) | #594E00 | 0.179 |
| Deuteranopia (no green cones) | #796B00 | 0.160 |
| Tritanopia (no blue cones) | #C6002A | 0.061 |
| Achromatopsia (no color) | #606060 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33100
#B33100
oklch(51% 0.173 36.3)
- #007287
#007287
oklch(50.9% 0.091 216.4)
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 #B33100, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.011
- Rust Red #AA2704 ΔE 0.027
- Sinopia #BB3E03 ΔE 0.030
- Rufous #AE2012 ΔE 0.030
- Firebrick #B22222 ΔE 0.033
- Russet #A13905 ΔE 0.036
- Brick #A03623 ΔE 0.040
- Brown #A52A2A ΔE 0.045
Use #B33100 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.