#663B4E
Closest named color: Purple Brown (#673A3F). oklch(41.1% 0.066 352.4), rgb(102, 59, 78).
Aa
White text reads best on this color (9.12:1).
About this color
#663B4E is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.066 and its hue 352°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.024 away. White text reads best on it, at 9.12:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.066) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.30:1 |
| White text | 9.12:1 |
Values
| HEX | #663B4E |
| RGB | rgb(102, 59, 78) |
| HSL | hsl(333, 27%, 32%) |
| OKLCH | oklch(41.1% 0.066 352.4) |
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 #663B4E | 9.12:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #663B4E | 2.30:1 | Fails | Lc 13.1 | Not readable |
| #663B4E text on white | 9.12:1 | AAA | Lc 90.8 | Preferred for body text |
| #663B4E text on black | 2.30:1 | Fails | Lc -11.5 | Not readable |
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 800.
-
Step 50
50
#F8F4F6
oklch(97.1% 0.005 345.3)
-
Step 100
100
#F0E7EA
oklch(93.6% 0.011 354.9)
-
Step 200
200
#E5D4DA
oklch(88.5% 0.02 354.1)
-
Step 300
300
#D6B7C3
oklch(81% 0.039 352.7)
-
Step 400
400
#C091A4
oklch(70.7% 0.062 352.7)
-
Step 500
500
#AF768E
oklch(63.2% 0.078 352.7)
-
Step 600
600
#9A5E78
oklch(55.7% 0.085 352.7)
-
Step 700
700
#834D65
oklch(49% 0.079 352.3)
-
Step 800
800 (this color)
#663B4E
oklch(41.1% 0.066 352.4)
-
Step 900
900
#573644
oklch(37.7% 0.051 352.8)
-
Step 950
950
#332028
oklch(27.1% 0.032 352.5)
#663B4E 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) | #40444F | 0.070 |
| Deuteranopia (no green cones) | #4A4B4D | 0.066 |
| Tritanopia (no blue cones) | #6C3942 | 0.022 |
| Achromatopsia (no color) | #484848 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B4E
#663B4E
oklch(41.1% 0.066 352.4)
- #1B5647
#1B5647
oklch(41% 0.066 173)
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 #663B4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.024
- Brownish Purple #76424E ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.082
- Dark Mauve #874C62 ΔE 0.084
- Dusty Grape #545775 ΔE 0.089
- Chestnut #742802 ΔE 0.091
- Red Purple #820747 ΔE 0.092
- Velvet #750851 ΔE 0.093
Use #663B4E 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.