#B63816
Closest named color: Sinopia (#BB3E03). oklch(52.3% 0.168 35.1), rgb(182, 56, 22).
Aa
White text reads best on this color (5.88:1).
About this color
#B63816 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.168 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.019 away. White text reads best on it, at 5.88:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.168) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.56:1 |
| White text | 5.88:1 |
Values
| HEX | #B63816 |
| RGB | rgb(182, 56, 22) |
| HSL | hsl(13, 78%, 40%) |
| OKLCH | oklch(52.3% 0.168 35.1) |
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 #B63816 | 5.88:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #B63816 | 3.56:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #B63816 text on white | 5.88:1 | AA | Lc 78.3 | Fine for body text |
| #B63816 text on black | 3.56:1 | AA large text | Lc -23.5 | 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
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
#F0AE9D
oklch(80.8% 0.082 35)
-
Step 400
400
#E58167
oklch(70.7% 0.129 35.5)
-
Step 500
500
#DB5C3C
oklch(63.1% 0.167 35.3)
-
Step 600
600
#C63C17
oklch(55.5% 0.181 35)
-
Step 700
700 (this color)
#B63816
oklch(52.3% 0.168 35.1)
-
Step 800
800
#8B270C
oklch(42.7% 0.14 35)
-
Step 900
900
#702614
oklch(37.8% 0.109 34.8)
-
Step 950
950
#42170D
oklch(27% 0.07 34.5)
#B63816 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) | #5E530F | 0.173 |
| Deuteranopia (no green cones) | #7D6F0D | 0.158 |
| Tritanopia (no blue cones) | #C90432 | 0.065 |
| Achromatopsia (no color) | #646464 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63816
#B63816
oklch(52.3% 0.168 35.1)
- #00778B
#00778B
oklch(52.4% 0.092 214.8)
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 #B63816, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.019
- Rusty Red #AF2F0D ΔE 0.022
- Firebrick #B22222 ΔE 0.038
- Dull Red #BB3F3F ΔE 0.039
- Rust Red #AA2704 ΔE 0.040
- Rufous #AE2012 ΔE 0.041
- Russet #A13905 ΔE 0.044
- Brick Orange #C14A09 ΔE 0.045
Use #B63816 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.