#66407C
Closest named color: Twilight (#4E518B). oklch(44.2% 0.104 312), rgb(102, 64, 124).
Aa
White text reads best on this color (8.11:1).
About this color
#66407C is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.104 and its hue 312°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.059 away. White text reads best on it, at 8.11:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.104) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.58:1 |
| White text | 8.11:1 |
Values
| HEX | #66407C |
| RGB | rgb(102, 64, 124) |
| HSL | hsl(278, 32%, 37%) |
| OKLCH | oklch(44.2% 0.104 312) |
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 #66407C | 8.11:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #66407C | 2.58:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #66407C text on white | 8.11:1 | AAA | Lc 87.9 | Fine for body text |
| #66407C text on black | 2.58:1 | Fails | Lc -14.3 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EEE7F3
oklch(93.7% 0.018 311.6)
-
Step 200
200
#E1D3EA
oklch(88.5% 0.035 312.4)
-
Step 300
300
#CEB6DE
oklch(80.9% 0.061 311.8)
-
Step 400
400
#B58FCD
oklch(70.7% 0.097 311.9)
-
Step 500
500
#A372BF
oklch(63.1% 0.124 312.5)
-
Step 600
600
#8D59AC
oklch(55.6% 0.135 311.6)
-
Step 700
700
#784993
oklch(49.1% 0.124 311.9)
-
Step 800
800 (this color)
#66407C
oklch(44.2% 0.104 312)
-
Step 900
900
#503460
oklch(37.7% 0.08 312.3)
-
Step 950
950
#2F1F38
oklch(27.1% 0.05 312.7)
#66407C 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) | #334E7E | 0.085 |
| Deuteranopia (no green cones) | #3D517A | 0.078 |
| Tritanopia (no blue cones) | #644958 | 0.072 |
| Achromatopsia (no color) | #505050 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66407C
#66407C
oklch(44.2% 0.104 312)
- #3C5E1A
#3C5E1A
oklch(44% 0.103 132.2)
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 #66407C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.059
- Rebecca Purple #663399 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.062
- Dusk #4E5481 ΔE 0.063
- Light Eggplant #894585 ΔE 0.070
- Blueberry #464196 ΔE 0.071
- Dusty Grape #545775 ΔE 0.072
- Brownish Purple #76424E ΔE 0.085
Use #66407C 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.