#B63D0B
Closest named color: Sinopia (#BB3E03). oklch(52.8% 0.165 38.5), rgb(182, 61, 11).
Aa
White text reads best on this color (5.73:1).
About this color
#B63D0B is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.165 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.011 away. White text reads best on it, at 5.73:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.165) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #B63D0B |
| RGB | rgb(182, 61, 11) |
| HSL | hsl(18, 89%, 38%) |
| OKLCH | oklch(52.8% 0.165 38.5) |
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 #B63D0B | 5.73:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #B63D0B | 3.66:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #B63D0B text on white | 5.73:1 | AA | Lc 77.6 | Fine for body text |
| #B63D0B text on black | 3.66:1 | AA large text | Lc -24.2 | 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 600.
-
Step 50
50
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F8E5E0
oklch(93.6% 0.022 35.1)
-
Step 200
200
#F3D1C6
oklch(88.6% 0.041 38.7)
-
Step 300
300
#ECB19E
oklch(81% 0.074 38.6)
-
Step 400
400
#DF8568
oklch(70.6% 0.119 38.6)
-
Step 500
500
#D4633E
oklch(63.1% 0.152 38.5)
-
Step 600
600 (this color)
#B63D0B
oklch(52.8% 0.165 38.5)
-
Step 700
700
#A53609
oklch(49.1% 0.154 38.3)
-
Step 800
800
#862E0E
oklch(42.7% 0.128 38.3)
-
Step 900
900
#6C2B15
oklch(37.8% 0.099 38.6)
-
Step 950
950
#3F1A0D
oklch(27% 0.062 39.6)
#B63D0B 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) | #615500 | 0.167 |
| Deuteranopia (no green cones) | #7F7000 | 0.150 |
| Tritanopia (no blue cones) | #C91535 | 0.071 |
| Achromatopsia (no color) | #666666 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63D0B
#B63D0B
oklch(52.8% 0.165 38.5)
- #007890
#007890
oklch(52.9% 0.095 218.2)
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 #B63D0B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.011
- Rusty Red #AF2F0D ΔE 0.030
- Brick Orange #C14A09 ΔE 0.036
- Cinnamon #AC4F06 ΔE 0.038
- Burnt Orange #C04E01 ΔE 0.042
- Burnt Siena #B75203 ΔE 0.043
- Burnt Umber #A0450E ΔE 0.043
- Dull Red #BB3F3F ΔE 0.044
Use #B63D0B 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.