#66379D
Closest named color: Rebecca Purple (#663399). oklch(44.9% 0.159 301.4), rgb(102, 55, 157).
Aa
White text reads best on this color (8.08:1).
About this color
#66379D is a dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.159 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.010 away. White text reads best on it, at 8.08:1.
| Hue family | Purples |
| Lightness | dark (45%) |
| Chroma | vivid (0.159) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.59:1 |
| White text | 8.08:1 |
Values
| HEX | #66379D |
| RGB | rgb(102, 55, 157) |
| HSL | hsl(268, 48%, 42%) |
| OKLCH | oklch(44.9% 0.159 301.4) |
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 #66379D | 8.08:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #66379D | 2.59:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #66379D text on white | 8.08:1 | AAA | Lc 87.5 | Fine for body text |
| #66379D text on black | 2.59:1 | Fails | Lc -14.6 | 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
#F7F4FD
oklch(97.2% 0.012 301.3)
-
Step 100
100
#EDE6F9
oklch(93.6% 0.026 302.6)
-
Step 200
200
#DFD2F7
oklch(88.6% 0.052 301.3)
-
Step 300
300
#CBB3F4
oklch(81% 0.093 301.3)
-
Step 400
400
#B188EE
oklch(70.6% 0.15 301.2)
-
Step 500
500
#9F66E8
oklch(63.1% 0.191 301.4)
-
Step 600
600
#8B49D6
oklch(55.7% 0.207 301.4)
-
Step 700
700
#7639B9
oklch(49.1% 0.192 301.4)
-
Step 800
800 (this color)
#66379D
oklch(44.9% 0.159 301.4)
-
Step 900
900
#4E2C77
oklch(37.6% 0.124 301.6)
-
Step 950
950
#2E1B46
oklch(27.1% 0.079 301.8)
#66379D 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) | #004FA0 | 0.120 |
| Deuteranopia (no green cones) | #0F4F9B | 0.117 |
| Tritanopia (no blue cones) | #5B4D65 | 0.118 |
| Achromatopsia (no color) | #505050 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66379D
#66379D
oklch(44.9% 0.159 301.4)
- #4C5D00
#4C5D00
oklch(44.8% 0.108 121.2)
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 #66379D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.010
- Blueberry #464196 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.062
- Grape #7209B7 ΔE 0.069
- Bluey Purple #6241C7 ΔE 0.070
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
- Chrysanthemum #560BAD ΔE 0.076
- Twilight #4E518B ΔE 0.081
Use #66379D 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.