#663F4F
Closest named color: Purple Brown (#673A3F). oklch(41.9% 0.059 353.7), rgb(102, 63, 79).
Aa
White text reads best on this color (8.79:1).
About this color
#663F4F is a dark, muted red. In OKLCH its lightness is 42%, its chroma 0.059 and its hue 354°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.025 away. White text reads best on it, at 8.79:1.
| Hue family | Reds |
| Lightness | dark (42%) |
| Chroma | muted (0.059) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.38:1 |
| White text | 8.79:1 |
Values
| HEX | #663F4F |
| RGB | rgb(102, 63, 79) |
| HSL | hsl(335, 24%, 32%) |
| OKLCH | oklch(41.9% 0.059 353.7) |
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 #663F4F | 8.79:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #663F4F | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #663F4F text on white | 8.79:1 | AAA | Lc 90.0 | Fine for body text |
| #663F4F text on black | 2.38:1 | Fails | Lc -12.3 | 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
#E4D4DA
oklch(88.5% 0.019 352.7)
-
Step 300
300
#D4B8C2
oklch(80.9% 0.035 354.3)
-
Step 400
400
#BD93A3
oklch(70.7% 0.055 353.8)
-
Step 500
500
#AC788C
oklch(63.1% 0.07 354.5)
-
Step 600
600
#976077
oklch(55.6% 0.078 353.2)
-
Step 700
700
#804F64
oklch(49% 0.072 352.8)
-
Step 800
800 (this color)
#663F4F
oklch(41.9% 0.059 353.7)
-
Step 900
900
#553743
oklch(37.6% 0.046 353.9)
-
Step 950
950
#322127
oklch(27.1% 0.028 356.2)
#663F4F 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) | #434650 | 0.063 |
| Deuteranopia (no green cones) | #4D4D4E | 0.058 |
| Tritanopia (no blue cones) | #6C3D45 | 0.019 |
| Achromatopsia (no color) | #4B4B4B | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F4F
#663F4F
oklch(41.9% 0.059 353.7)
- #25574A
#25574A
oklch(41.8% 0.059 173.9)
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 #663F4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.025
- Brownish Purple #76424E ΔE 0.033
- Dark Mauve #874C62 ΔE 0.079
- Charcoal Grey #3C4142 ΔE 0.080
- Dusty Grape #545775 ΔE 0.081
- Dusk #4E5481 ΔE 0.093
- Chestnut #742802 ΔE 0.094
- Mud Brown #60460F ΔE 0.095
Use #663F4F 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.