#66379A
Closest named color: Rebecca Purple (#663399). oklch(44.7% 0.156 302.3), rgb(102, 55, 154).
Aa
White text reads best on this color (8.14:1).
About this color
#66379A is a dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.156 and its hue 302°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.008 away. White text reads best on it, at 8.14:1.
| Hue family | Purples |
| Lightness | dark (45%) |
| Chroma | vivid (0.156) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.57:1 |
| White text | 8.14:1 |
Values
| HEX | #66379A |
| RGB | rgb(102, 55, 154) |
| HSL | hsl(268, 47%, 41%) |
| OKLCH | oklch(44.7% 0.156 302.3) |
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 #66379A | 8.14:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #66379A | 2.57:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #66379A text on white | 8.14:1 | AAA | Lc 87.7 | Fine for body text |
| #66379A text on black | 2.57:1 | Fails | Lc -14.4 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F9
oklch(93.6% 0.026 302.6)
-
Step 200
200
#DFD2F6
oklch(88.5% 0.051 301.8)
-
Step 300
300
#CCB3F2
oklch(81% 0.091 302.6)
-
Step 400
400
#B288EB
oklch(70.6% 0.146 302.4)
-
Step 500
500
#A067E5
oklch(63.1% 0.186 302.2)
-
Step 600
600
#8C4AD3
oklch(55.7% 0.202 302.4)
-
Step 700
700
#773AB7
oklch(49.2% 0.188 302.3)
-
Step 800
800 (this color)
#66379A
oklch(44.7% 0.156 302.3)
-
Step 900
900
#4F2D76
oklch(37.8% 0.121 302.4)
-
Step 950
950
#2E1B45
oklch(27% 0.077 302.4)
#66379A 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) | #004F9D | 0.121 |
| Deuteranopia (no green cones) | #164F98 | 0.114 |
| Tritanopia (no blue cones) | #5C4C63 | 0.115 |
| Achromatopsia (no color) | #4F4F4F | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66379A
#66379A
oklch(44.7% 0.156 302.3)
- #4A5D00
#4A5D00
oklch(44.6% 0.109 122.4)
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 #66379A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.008
- Blueberry #464196 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.060
- Grape #7209B7 ΔE 0.073
- Bluey Purple #6241C7 ΔE 0.075
- Chrysanthemum #560BAD ΔE 0.078
- Twilight #4E518B ΔE 0.079
- Blue With A Hint Of Purple #533CC6 ΔE 0.080
Use #66379A 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.