#B63A3B
Closest named color: Dull Red (#BB3F3F). oklch(53% 0.16 24), rgb(182, 58, 59).
Aa
White text reads best on this color (5.74:1).
About this color
#B63A3B is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.160 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.015 away. White text reads best on it, at 5.74:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.160) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.65:1 |
| White text | 5.74:1 |
Values
| HEX | #B63A3B |
| RGB | rgb(182, 58, 59) |
| HSL | hsl(360, 52%, 47%) |
| OKLCH | oklch(53% 0.16 24) |
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 #B63A3B | 5.74:1 | AA | Lc -83.0 | Fine for body text |
| Black text on #B63A3B | 3.65:1 | AA large text | Lc 26.4 | Dividers and decoration only |
| #B63A3B text on white | 5.74:1 | AA | Lc 77.7 | Fine for body text |
| #B63A3B text on black | 3.65:1 | AA large text | Lc -24.1 | 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 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
#F3D0CC
oklch(88.6% 0.04 25.6)
-
Step 300
300
#ECAFAA
oklch(80.9% 0.072 24.1)
-
Step 400
400
#DF837D
oklch(70.7% 0.114 24.3)
-
Step 500
500
#D4605C
oklch(63.1% 0.148 24.2)
-
Step 600
600 (this color)
#B63A3B
oklch(53% 0.16 24)
-
Step 700
700
#A43334
oklch(49% 0.149 24)
-
Step 800
800
#862C2C
oklch(42.8% 0.124 23.9)
-
Step 900
900
#6C2927
oklch(37.8% 0.096 24.5)
-
Step 950
950
#3F1917
oklch(27% 0.06 24.9)
#B63A3B 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) | #5C553A | 0.172 |
| Deuteranopia (no green cones) | #7B7037 | 0.159 |
| Tritanopia (no blue cones) | #C8183C | 0.047 |
| Achromatopsia (no color) | #666666 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63A3B
#B63A3B
oklch(53% 0.16 24)
- #007A84
#007A84
oklch(52.9% 0.09 204.8)
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 #B63A3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.015
- Dusty Red #B9484E ΔE 0.031
- Firebrick #B22222 ΔE 0.039
- Rusty Red #AF2F0D ΔE 0.043
- Dark Rose #B5485D ΔE 0.044
- Sinopia #BB3E03 ΔE 0.045
- Light Burgundy #A8415B ΔE 0.049
- Brown #A52A2A ΔE 0.049
Use #B63A3B 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.