#66397F
Closest named color: Rebecca Purple (#663399). oklch(43.2% 0.12 312.1), rgb(102, 57, 127).
Aa
White text reads best on this color (8.54:1).
About this color
#66397F is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.120 and its hue 312°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.046 away. White text reads best on it, at 8.54:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.45:1 |
| White text | 8.54:1 |
Values
| HEX | #66397F |
| RGB | rgb(102, 57, 127) |
| HSL | hsl(279, 38%, 36%) |
| OKLCH | oklch(43.2% 0.12 312.1) |
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 #66397F | 8.54:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #66397F | 2.45:1 | Fails | Lc 14.9 | Not readable |
| #66397F text on white | 8.54:1 | AAA | Lc 89.1 | Fine for body text |
| #66397F text on black | 2.45:1 | Fails | Lc -13.1 | 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
#F8F4FA
oklch(97.2% 0.009 314.8)
-
Step 100
100
#EEE6F4
oklch(93.5% 0.021 311.1)
-
Step 200
200
#E2D2EC
oklch(88.5% 0.039 312.6)
-
Step 300
300
#D0B4E2
oklch(80.9% 0.07 312.1)
-
Step 400
400
#B88CD3
oklch(70.7% 0.111 312)
-
Step 500
500
#A66DC7
oklch(63% 0.143 312.1)
-
Step 600
600
#9153B4
oklch(55.5% 0.156 311.9)
-
Step 700
700
#7C439B
oklch(49.1% 0.145 312.1)
-
Step 800
800 (this color)
#66397F
oklch(43.2% 0.12 312.1)
-
Step 900
900
#523165
oklch(37.7% 0.093 312)
-
Step 950
950
#301D3B
oklch(27% 0.059 312.1)
#66397F 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) | #264A81 | 0.103 |
| Deuteranopia (no green cones) | #354D7D | 0.091 |
| Tritanopia (no blue cones) | #634556 | 0.083 |
| Achromatopsia (no color) | #4C4C4C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66397F
#66397F
oklch(43.2% 0.12 312.1)
- #365D00
#365D00
oklch(43.2% 0.12 132)
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 #66397F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.058
- Blueberry #464196 ΔE 0.068
- Twilight #4E518B ΔE 0.071
- Light Eggplant #894585 ΔE 0.077
- Dusk #4E5481 ΔE 0.079
- Purple #800080 ΔE 0.086
- Dusty Grape #545775 ΔE 0.090
Use #66397F 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.