#B63501
Closest named color: Sinopia (#BB3E03). oklch(51.9% 0.173 37.1), rgb(182, 53, 1).
Aa
White text reads best on this color (6.00:1).
About this color
#B63501 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.173 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.020 away. White text reads best on it, at 6.00:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.173) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.49:1 |
| White text | 6.00:1 |
Values
| HEX | #B63501 |
| RGB | rgb(182, 53, 1) |
| HSL | hsl(17, 99%, 36%) |
| OKLCH | oklch(51.9% 0.173 37.1) |
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 #B63501 | 6.00:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #B63501 | 3.49:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #B63501 text on white | 6.00:1 | AA | Lc 78.7 | Fine for body text |
| #B63501 text on black | 3.49:1 | AA large text | Lc -23.1 | 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
#F6CFC4
oklch(88.5% 0.047 36.3)
-
Step 300
300
#F1AE9A
oklch(80.9% 0.084 37.3)
-
Step 400
400
#E78062
oklch(70.7% 0.134 37.1)
-
Step 500
500
#DC5B34
oklch(63.1% 0.171 37.2)
-
Step 600
600
#C83B00
oklch(55.7% 0.186 37.1)
-
Step 700
700 (this color)
#B63501
oklch(51.9% 0.173 37.1)
-
Step 800
800
#8C2600
oklch(42.7% 0.143 37)
-
Step 900
900
#70250E
oklch(37.6% 0.111 36.8)
-
Step 950
950
#42170A
oklch(26.9% 0.071 37.3)
#B63501 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) | #5D5100 | 0.176 |
| Deuteranopia (no green cones) | #7C6E00 | 0.159 |
| Tritanopia (no blue cones) | #C9002E | 0.066 |
| Achromatopsia (no color) | #636363 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63501
#B63501
oklch(51.9% 0.173 37.1)
- #00758B
#00758B
oklch(51.9% 0.093 216.9)
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 #B63501, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.020
- Rusty Red #AF2F0D ΔE 0.020
- Rust Red #AA2704 ΔE 0.036
- Firebrick #B22222 ΔE 0.039
- Rufous #AE2012 ΔE 0.039
- Russet #A13905 ΔE 0.041
- Burnt Umber #A0450E ΔE 0.047
- Brick Orange #C14A09 ΔE 0.047
Use #B63501 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.