#66438B
Closest named color: Rebecca Purple (#663399). oklch(45.6% 0.118 304.6), rgb(102, 67, 139).
Aa
White text reads best on this color (7.66:1).
About this color
#66438B is a medium-dark, moderately saturated purple. In OKLCH its lightness is 46%, its chroma 0.118 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.045 away. White text reads best on it, at 7.66:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.118) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.74:1 |
| White text | 7.66:1 |
Values
| HEX | #66438B |
| RGB | rgb(102, 67, 139) |
| HSL | hsl(269, 35%, 40%) |
| OKLCH | oklch(45.6% 0.118 304.6) |
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 #66438B | 7.66:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #66438B | 2.74:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #66438B text on white | 7.66:1 | AAA | Lc 86.4 | Fine for body text |
| #66438B text on black | 2.74:1 | Fails | Lc -15.7 | Dividers and decoration only |
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
#EDE7F5
oklch(93.7% 0.02 305.3)
-
Step 200
200
#DFD3EE
oklch(88.5% 0.039 305.6)
-
Step 300
300
#CAB6E5
oklch(80.9% 0.069 304.3)
-
Step 400
400
#B08FD8
oklch(70.7% 0.11 304.5)
-
Step 500
500
#9D71CD
oklch(63.1% 0.14 304.8)
-
Step 600
600
#8858BA
oklch(55.7% 0.152 304.6)
-
Step 700
700
#7347A1
oklch(49.1% 0.143 304.2)
-
Step 800
800 (this color)
#66438B
oklch(45.6% 0.118 304.6)
-
Step 900
900
#4D3368
oklch(37.7% 0.092 305.1)
-
Step 950
950
#2D1E3D
oklch(26.9% 0.059 305.1)
#66438B 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) | #2D528D | 0.088 |
| Deuteranopia (no green cones) | #375389 | 0.080 |
| Tritanopia (no blue cones) | #605060 | 0.088 |
| Achromatopsia (no color) | #535353 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66438B
#66438B
oklch(45.6% 0.118 304.6)
- #496100
#496100
oklch(45.6% 0.114 124.7)
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 #66438B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.045
- Twilight #4E518B ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.057
- Blueberry #464196 ΔE 0.060
- Dusk #4E5481 ΔE 0.063
- Light Eggplant #894585 ΔE 0.068
- Dusty Grape #545775 ΔE 0.077
- Dusky Blue #475F94 ΔE 0.083
Use #66438B 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.