#66388C
Closest named color: Rebecca Purple (#663399). oklch(43.8% 0.137 306.9), rgb(102, 56, 140).
Aa
White text reads best on this color (8.36:1).
About this color
#66388C is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.137 and its hue 307°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.025 away. White text reads best on it, at 8.36:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.137) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.50:1 |
| White text | 8.36:1 |
Values
| HEX | #66388C |
| RGB | rgb(102, 56, 140) |
| HSL | hsl(273, 43%, 38%) |
| OKLCH | oklch(43.8% 0.137 306.9) |
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 #66388C | 8.36:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #66388C | 2.50:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #66388C text on white | 8.36:1 | AAA | Lc 88.5 | Fine for body text |
| #66388C text on black | 2.50:1 | Fails | Lc -13.7 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EEE6F6
oklch(93.6% 0.023 308.2)
-
Step 200
200
#E1D2F1
oklch(88.5% 0.045 307.2)
-
Step 300
300
#CEB3EA
oklch(80.8% 0.081 306.9)
-
Step 400
400
#B58ADF
oklch(70.6% 0.128 306.6)
-
Step 500
500
#A46AD6
oklch(63.1% 0.165 307.1)
-
Step 600
600
#8F4FC3
oklch(55.6% 0.178 307)
-
Step 700
700
#7A3FA8
oklch(49.1% 0.165 307.2)
-
Step 800
800 (this color)
#66388C
oklch(43.8% 0.137 306.9)
-
Step 900
900
#512F6D
oklch(37.8% 0.107 307.4)
-
Step 950
950
#2F1C40
oklch(27% 0.068 306.8)
#66388C 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) | #164C8F | 0.114 |
| Deuteranopia (no green cones) | #2A4E8A | 0.102 |
| Tritanopia (no blue cones) | #60485C | 0.099 |
| Achromatopsia (no color) | #4E4E4E | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66388C
#66388C
oklch(43.8% 0.137 306.9)
- #415D00
#415D00
oklch(43.9% 0.114 127.2)
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 #66388C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.025
- Dark Slate Blue #483D8B ΔE 0.055
- Blueberry #464196 ΔE 0.060
- Twilight #4E518B ΔE 0.072
- Light Eggplant #894585 ΔE 0.080
- Purple #800080 ΔE 0.084
- Dusk #4E5481 ΔE 0.085
- Grape #7209B7 ΔE 0.092
Use #66388C 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.