#663B59
Closest named color: Purple Brown (#673A3F). oklch(41.5% 0.074 339.1), rgb(102, 59, 89).
Aa
White text reads best on this color (8.99:1).
About this color
#663B59 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.074 and its hue 339°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.043 away. White text reads best on it, at 8.99:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.074) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #663B59 |
| RGB | rgb(102, 59, 89) |
| HSL | hsl(318, 27%, 32%) |
| OKLCH | oklch(41.5% 0.074 339.1) |
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 #663B59 | 8.99:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #663B59 | 2.33:1 | Fails | Lc 13.5 | Not readable |
| #663B59 text on white | 8.99:1 | AAA | Lc 90.5 | Preferred for body text |
| #663B59 text on black | 2.33:1 | Fails | Lc -11.8 | 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
#F8F4F7
oklch(97.1% 0.006 334)
-
Step 100
100
#F0E7ED
oklch(93.7% 0.013 337.5)
-
Step 200
200
#E5D3DE
oklch(88.5% 0.025 340.3)
-
Step 300
300
#D4B6CA
oklch(80.8% 0.044 338.3)
-
Step 400
400
#BE90AF
oklch(70.7% 0.069 338.8)
-
Step 500
500
#AD749B
oklch(63% 0.089 339.1)
-
Step 600
600
#985C86
oklch(55.6% 0.096 338.9)
-
Step 700
700
#824C71
oklch(49.2% 0.089 339.7)
-
Step 800
800 (this color)
#663B59
oklch(41.5% 0.074 339.1)
-
Step 900
900
#56354C
oklch(37.7% 0.059 338.7)
-
Step 950
950
#321F2C
oklch(26.9% 0.037 339)
#663B59 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) | #3C455A | 0.076 |
| Deuteranopia (no green cones) | #474C58 | 0.070 |
| Tritanopia (no blue cones) | #6B3C46 | 0.034 |
| Achromatopsia (no color) | #494949 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B59
#663B59
oklch(41.5% 0.074 339.1)
- #21583D
#21583D
oklch(41.5% 0.074 159.2)
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 #663B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.043
- Brownish Purple #76424E ΔE 0.046
- Dark Mauve #874C62 ΔE 0.082
- Dusty Grape #545775 ΔE 0.082
- Velvet #750851 ΔE 0.088
- Dusk #4E5481 ΔE 0.088
- Charcoal Grey #3C4142 ΔE 0.090
- Grape Purple #5D1451 ΔE 0.091
Use #663B59 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.