#B63C04
Closest named color: Sinopia (#BB3E03). oklch(52.7% 0.167 39), rgb(182, 60, 4).
Aa
White text reads best on this color (5.77:1).
About this color
#B63C04 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.167 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 5.77:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.63:1 |
| White text | 5.77:1 |
Values
| HEX | #B63C04 |
| RGB | rgb(182, 60, 4) |
| HSL | hsl(19, 96%, 36%) |
| OKLCH | oklch(52.7% 0.167 39) |
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 #B63C04 | 5.77:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #B63C04 | 3.63:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #B63C04 text on white | 5.77:1 | AA | Lc 77.8 | Fine for body text |
| #B63C04 text on black | 3.63:1 | AA large text | Lc -24.0 | 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 600.
-
Step 50
50
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F8E5DF
oklch(93.5% 0.022 38.3)
-
Step 200
200
#F3D0C5
oklch(88.4% 0.042 38.2)
-
Step 300
300
#ECB19D
oklch(81% 0.075 39.5)
-
Step 400
400
#E08567
oklch(70.7% 0.12 39)
-
Step 500
500
#D5633C
oklch(63.2% 0.154 39)
-
Step 600
600 (this color)
#B63C04
oklch(52.7% 0.167 39)
-
Step 700
700
#A53604
oklch(49.1% 0.155 39)
-
Step 800
800
#862E0B
oklch(42.7% 0.128 39)
-
Step 900
900
#6C2A13
oklch(37.6% 0.1 38.9)
-
Step 950
950
#401A0D
oklch(27.1% 0.063 39.2)
#B63C04 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) | #615400 | 0.166 |
| Deuteranopia (no green cones) | #7F7000 | 0.150 |
| Tritanopia (no blue cones) | #C91134 | 0.072 |
| Achromatopsia (no color) | #666666 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63C04
#B63C04
oklch(52.7% 0.167 39)
- #007790
#007790
oklch(52.6% 0.095 219.3)
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 #B63C04, 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 0.029
- Brick Orange #C14A09 ΔE 0.037
- Cinnamon #AC4F06 ΔE 0.039
- Burnt Orange #C04E01 ΔE 0.043
- Burnt Umber #A0450E ΔE 0.043
- Burnt Siena #B75203 ΔE 0.044
- Russet #A13905 ΔE 0.044
Use #B63C04 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.