#663F50
Closest named color: Purple Brown (#673A3F). oklch(41.9% 0.059 352.3), rgb(102, 63, 80).
Aa
White text reads best on this color (8.78:1).
About this color
#663F50 is a dark, muted red. In OKLCH its lightness is 42%, its chroma 0.059 and its hue 352°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.027 away. White text reads best on it, at 8.78:1.
| Hue family | Reds |
| Lightness | dark (42%) |
| Chroma | muted (0.059) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.39:1 |
| White text | 8.78:1 |
Values
| HEX | #663F50 |
| RGB | rgb(102, 63, 80) |
| HSL | hsl(334, 24%, 32%) |
| OKLCH | oklch(41.9% 0.059 352.3) |
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 #663F50 | 8.78:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #663F50 | 2.39:1 | Fails | Lc 14.0 | Not readable |
| #663F50 text on white | 8.78:1 | AAA | Lc 89.9 | Fine for body text |
| #663F50 text on black | 2.39:1 | 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
#D4B8C3
oklch(81% 0.035 352.2)
-
Step 400
400
#BD93A4
oklch(70.8% 0.055 352.4)
-
Step 500
500
#AC788E
oklch(63.2% 0.071 352.3)
-
Step 600
600
#976078
oklch(55.6% 0.078 352.2)
-
Step 700
700
#804F65
oklch(49% 0.072 351.6)
-
Step 800
800 (this color)
#663F50
oklch(41.9% 0.059 352.3)
-
Step 900
900
#553744
oklch(37.6% 0.047 352)
-
Step 950
950
#322128
oklch(27.1% 0.029 352.7)
#663F50 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) | #434751 | 0.064 |
| Deuteranopia (no green cones) | #4D4D4F | 0.058 |
| Tritanopia (no blue cones) | #6C3E45 | 0.020 |
| Achromatopsia (no color) | #4B4B4B | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F50
#663F50
oklch(41.9% 0.059 352.3)
- #255749
#255749
oklch(41.8% 0.059 172.5)
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 #663F50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.027
- Brownish Purple #76424E ΔE 0.034
- Dark Mauve #874C62 ΔE 0.078
- Dusty Grape #545775 ΔE 0.080
- Charcoal Grey #3C4142 ΔE 0.081
- Dusk #4E5481 ΔE 0.092
- Chestnut #742802 ΔE 0.095
- Dark Slate Gray #2F4F4F ΔE 0.097
Use #663F50 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.