#663E77
Closest named color: Twilight (#4E518B). oklch(43.5% 0.101 315.1), rgb(102, 62, 119).
Aa
White text reads best on this color (8.33:1).
About this color
#663E77 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.101 and its hue 315°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.064 away. White text reads best on it, at 8.33:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.101) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.52:1 |
| White text | 8.33:1 |
Values
| HEX | #663E77 |
| RGB | rgb(102, 62, 119) |
| HSL | hsl(282, 31%, 35%) |
| OKLCH | oklch(43.5% 0.101 315.1) |
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 #663E77 | 8.33:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #663E77 | 2.52:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #663E77 text on white | 8.33:1 | AAA | Lc 88.5 | Fine for body text |
| #663E77 text on black | 2.52:1 | Fails | Lc -13.6 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EEE7F2
oklch(93.7% 0.016 313.6)
-
Step 200
200
#E2D3E8
oklch(88.5% 0.033 316.4)
-
Step 300
300
#CFB6DB
oklch(80.9% 0.058 314.8)
-
Step 400
400
#B78FC9
oklch(70.8% 0.094 315.1)
-
Step 500
500
#A572BB
oklch(63.2% 0.12 315.2)
-
Step 600
600
#9059A7
oklch(55.6% 0.13 315.3)
-
Step 700
700
#7A4890
oklch(49% 0.123 314.7)
-
Step 800
800 (this color)
#663E77
oklch(43.5% 0.101 315.1)
-
Step 900
900
#51345E
oklch(37.7% 0.078 314.8)
-
Step 950
950
#301E37
oklch(26.9% 0.051 316.1)
#663E77 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) | #334C79 | 0.086 |
| Deuteranopia (no green cones) | #3E4F75 | 0.078 |
| Tritanopia (no blue cones) | #654655 | 0.067 |
| Achromatopsia (no color) | #4E4E4E | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E77
#663E77
oklch(43.5% 0.101 315.1)
- #375D1E
#375D1E
oklch(43.5% 0.102 135)
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 #663E77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.065
- Rebecca Purple #663399 ΔE 0.065
- Dusk #4E5481 ΔE 0.067
- Light Eggplant #894585 ΔE 0.074
- Dusty Grape #545775 ΔE 0.074
- Blueberry #464196 ΔE 0.076
- Brownish Purple #76424E ΔE 0.079
Use #663E77 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.