#B63D37
Closest named color: Dull Red (#BB3F3F). oklch(53.2% 0.158 26.7), rgb(182, 61, 55).
Aa
White text reads best on this color (5.65:1).
About this color
#B63D37 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.158 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.014 away. White text reads best on it, at 5.65:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.158) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #B63D37 |
| RGB | rgb(182, 61, 55) |
| HSL | hsl(3, 54%, 46%) |
| OKLCH | oklch(53.2% 0.158 26.7) |
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 #B63D37 | 5.65:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #B63D37 | 3.71:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #B63D37 text on white | 5.65:1 | AA | Lc 77.3 | Fine for body text |
| #B63D37 text on black | 3.71:1 | AA large text | Lc -24.4 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F7E5E3
oklch(93.6% 0.02 25.2)
-
Step 200
200
#F2D0CB
oklch(88.5% 0.039 27.8)
-
Step 300
300
#EBB0A8
oklch(81% 0.07 27.5)
-
Step 400
400
#DF847A
oklch(70.8% 0.114 27)
-
Step 500
500
#D36158
oklch(63.1% 0.146 26.6)
-
Step 600
600 (this color)
#B63D37
oklch(53.2% 0.158 26.7)
-
Step 700
700
#A43530
oklch(49.1% 0.147 26.6)
-
Step 800
800
#852D28
oklch(42.7% 0.122 26.8)
-
Step 900
900
#6B2A25
oklch(37.7% 0.094 26.9)
-
Step 950
950
#3F1916
oklch(27% 0.06 26.4)
#B63D37 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) | #5E5635 | 0.168 |
| Deuteranopia (no green cones) | #7C7133 | 0.155 |
| Tritanopia (no blue cones) | #C81D3D | 0.050 |
| Achromatopsia (no color) | #676767 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63D37
#B63D37
oklch(53.2% 0.158 26.7)
- #007B87
#007B87
oklch(53.3% 0.091 206.7)
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 #B63D37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.014
- Dusty Red #B9484E ΔE 0.031
- Sinopia #BB3E03 ΔE 0.038
- Rusty Red #AF2F0D ΔE 0.040
- Firebrick #B22222 ΔE 0.042
- Dark Rose #B5485D ΔE 0.048
- Rufous #AE2012 ΔE 0.052
- Brown #A52A2A ΔE 0.052
Use #B63D37 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.