#B63C39
Closest named color: Dull Red (#BB3F3F). oklch(53.2% 0.158 25.5), rgb(182, 60, 57).
Aa
White text reads best on this color (5.68:1).
About this color
#B63C39 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.158 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.013 away. White text reads best on it, at 5.68:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.158) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #B63C39 |
| RGB | rgb(182, 60, 57) |
| HSL | hsl(1, 52%, 47%) |
| OKLCH | oklch(53.2% 0.158 25.5) |
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 #B63C39 | 5.68:1 | AA | Lc -82.7 | Fine for body text |
| Black text on #B63C39 | 3.69:1 | AA large text | Lc 26.6 | Dividers and decoration only |
| #B63C39 text on white | 5.68:1 | AA | Lc 77.4 | Fine for body text |
| #B63C39 text on black | 3.69:1 | AA large text | Lc -24.3 | 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
#F8E5E3
oklch(93.7% 0.021 24.8)
-
Step 200
200
#F2D0CC
oklch(88.5% 0.039 25.8)
-
Step 300
300
#EBAFA9
oklch(80.8% 0.071 25.2)
-
Step 400
400
#DF837C
oklch(70.7% 0.115 25)
-
Step 500
500
#D3615A
oklch(63.1% 0.146 25.6)
-
Step 600
600 (this color)
#B63C39
oklch(53.2% 0.158 25.5)
-
Step 700
700
#A43532
oklch(49.2% 0.147 25.7)
-
Step 800
800
#852D2A
oklch(42.7% 0.122 25.6)
-
Step 900
900
#6B2926
oklch(37.6% 0.095 25.3)
-
Step 950
950
#3F1917
oklch(27% 0.06 24.9)
#B63C39 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) | #5D5638 | 0.170 |
| Deuteranopia (no green cones) | #7C7035 | 0.155 |
| Tritanopia (no blue cones) | #C81C3C | 0.048 |
| Achromatopsia (no color) | #676767 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63C39
#B63C39
oklch(53.2% 0.158 25.5)
- #007B86
#007B86
oklch(53.2% 0.091 205.7)
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 #B63C39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.013
- Dusty Red #B9484E ΔE 0.030
- Firebrick #B22222 ΔE 0.041
- Sinopia #BB3E03 ΔE 0.041
- Rusty Red #AF2F0D ΔE 0.041
- Dark Rose #B5485D ΔE 0.046
- Brown #A52A2A ΔE 0.051
- Rufous #AE2012 ΔE 0.051
Use #B63C39 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.