#B3300B
Closest named color: Rusty Red (#AF2F0D). oklch(50.9% 0.173 34.7), rgb(179, 48, 11).
Aa
White text reads best on this color (6.27:1).
About this color
#B3300B is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.173 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.009 away. White text reads best on it, at 6.27:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.173) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.34:1 |
| White text | 6.27:1 |
Values
| HEX | #B3300B |
| RGB | rgb(179, 48, 11) |
| HSL | hsl(13, 88%, 37%) |
| OKLCH | oklch(50.9% 0.173 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 #B3300B | 6.27:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #B3300B | 3.34:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #B3300B text on white | 6.27:1 | AA | Lc 79.9 | Fine for body text |
| #B3300B text on black | 3.34:1 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FAE5DF
oklch(93.7% 0.025 36.5)
-
Step 200
200
#F6CFC5
oklch(88.5% 0.046 34.7)
-
Step 300
300
#F1AE9C
oklch(80.9% 0.083 35.6)
-
Step 400
400
#E77F66
oklch(70.6% 0.134 34.5)
-
Step 500
500
#DD5A3A
oklch(63.1% 0.171 34.9)
-
Step 600
600
#C83912
oklch(55.5% 0.186 34.8)
-
Step 700
700 (this color)
#B3300B
oklch(50.9% 0.173 34.7)
-
Step 800
800
#8C2509
oklch(42.7% 0.143 34.8)
-
Step 900
900
#712512
oklch(37.8% 0.112 35)
-
Step 950
950
#42170C
oklch(27% 0.07 35.4)
#B3300B 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) | #594D01 | 0.180 |
| Deuteranopia (no green cones) | #796B00 | 0.163 |
| Tritanopia (no blue cones) | #C6002A | 0.057 |
| Achromatopsia (no color) | #606060 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B3300B
#B3300B
oklch(50.9% 0.173 34.7)
- #007286
#007286
oklch(50.8% 0.09 215.5)
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 #B3300B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.009
- Rust Red #AA2704 ΔE 0.025
- Rufous #AE2012 ΔE 0.027
- Firebrick #B22222 ΔE 0.028
- Sinopia #BB3E03 ΔE 0.032
- Russet #A13905 ΔE 0.037
- Brick #A03623 ΔE 0.038
- Brown #A52A2A ΔE 0.041
Use #B3300B 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.