#B03308
Closest named color: Rusty Red (#AF2F0D). oklch(50.7% 0.168 36.2), rgb(176, 51, 8).
Aa
White text reads best on this color (6.31:1).
About this color
#B03308 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.168 and its hue 36°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.008 away. White text reads best on it, at 6.31:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.168) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.32:1 |
| White text | 6.31:1 |
Values
| HEX | #B03308 |
| RGB | rgb(176, 51, 8) |
| HSL | hsl(15, 91%, 36%) |
| OKLCH | oklch(50.7% 0.168 36.2) |
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 #B03308 | 6.31:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #B03308 | 3.32:1 | AA large text | Lc 23.9 | Dividers and decoration only |
| #B03308 text on white | 6.31:1 | AA | Lc 80.2 | Fine for body text |
| #B03308 text on black | 3.32:1 | AA large text | Lc -21.6 | 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
#F5CFC5
oklch(88.4% 0.045 35.1)
-
Step 300
300
#F0AF9C
oklch(81% 0.081 36.9)
-
Step 400
400
#E58166
oklch(70.7% 0.13 36)
-
Step 500
500
#DB5D3A
oklch(63.2% 0.166 36.3)
-
Step 600
600
#C63D11
oklch(55.6% 0.181 36.2)
-
Step 700
700 (this color)
#B03308
oklch(50.7% 0.168 36.2)
-
Step 800
800
#8B2808
oklch(42.8% 0.139 36.2)
-
Step 900
900
#6F2712
oklch(37.7% 0.107 36.6)
-
Step 950
950
#42180C
oklch(27.1% 0.069 36.7)
#B03308 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 | 0.173 |
| Deuteranopia (no green cones) | #786A00 | 0.156 |
| Tritanopia (no blue cones) | #C2002C | 0.062 |
| Achromatopsia (no color) | #606060 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03308
#B03308
oklch(50.7% 0.168 36.2)
- #007186
#007186
oklch(50.6% 0.09 216.6)
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 #B03308, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.008
- Rust Red #AA2704 ΔE 0.024
- Rufous #AE2012 ΔE 0.029
- Russet #A13905 ΔE 0.030
- Firebrick #B22222 ΔE 0.032
- Sinopia #BB3E03 ΔE 0.032
- Brick #A03623 ΔE 0.034
- Brown #A52A2A ΔE 0.041
Use #B03308 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.