#66339B
Closest named color: Rebecca Purple (#663399). oklch(44.2% 0.163 302.8), rgb(102, 51, 155).
Aa
White text reads best on this color (8.36:1).
About this color
#66339B is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.163 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.003 away. White text reads best on it, at 8.36:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.163) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.51:1 |
| White text | 8.36:1 |
Values
| HEX | #66339B |
| RGB | rgb(102, 51, 155) |
| HSL | hsl(269, 50%, 40%) |
| OKLCH | oklch(44.2% 0.163 302.8) |
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 #66339B | 8.36:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #66339B | 2.51:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #66339B text on white | 8.36:1 | AAA | Lc 88.3 | Fine for body text |
| #66339B text on black | 2.51:1 | Fails | Lc -13.9 | 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
#EDE6FA
oklch(93.6% 0.028 301.7)
-
Step 200
200
#E0D1F7
oklch(88.5% 0.054 303.2)
-
Step 300
300
#CCB2F4
oklch(80.9% 0.095 302.4)
-
Step 400
400
#B487EE
oklch(70.8% 0.152 302.9)
-
Step 500
500
#A264E8
oklch(63.1% 0.194 302.9)
-
Step 600
600
#8E46D6
oklch(55.6% 0.211 303)
-
Step 700
700
#7836BA
oklch(49.1% 0.197 302.5)
-
Step 800
800 (this color)
#66339B
oklch(44.2% 0.163 302.8)
-
Step 900
900
#502B78
oklch(37.8% 0.127 302.9)
-
Step 950
950
#2F1A46
oklch(27% 0.081 303.5)
#66339B 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) | #004D9E | 0.124 |
| Deuteranopia (no green cones) | #084D99 | 0.123 |
| Tritanopia (no blue cones) | #5B4A62 | 0.120 |
| Achromatopsia (no color) | #4E4E4E | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66339B
#66339B
oklch(44.2% 0.163 302.8)
- #485C00
#485C00
oklch(44.2% 0.108 123)
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 #66339B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.003
- Blueberry #464196 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.062
- Grape #7209B7 ΔE 0.066
- Chrysanthemum #560BAD ΔE 0.071
- Bluey Purple #6241C7 ΔE 0.076
- Blue With A Hint Of Purple #533CC6 ΔE 0.080
- Blurple #5539CC ΔE 0.086
Use #66339B 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.