#666391
Closest named color: Muted Purple (#805B87). oklch(52.1% 0.072 286.6), rgb(102, 99, 145).
Aa
White text reads best on this color (5.58:1).
About this color
#666391 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.072 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Purple (#805B87), ΔE 0.046 away. White text reads best on it, at 5.58:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Muted Purple (#805B87) |
| Black text | 3.75:1 |
| White text | 5.58:1 |
Values
| HEX | #666391 |
| RGB | rgb(102, 99, 145) |
| HSL | hsl(244, 19%, 48%) |
| OKLCH | oklch(52.1% 0.072 286.6) |
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 #666391 | 5.58:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #666391 | 3.75:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #666391 text on white | 5.58:1 | AA | Lc 77.9 | Fine for body text |
| #666391 text on black | 3.75:1 | AA large text | Lc -23.9 | 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 700.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D8D7E6
oklch(88.4% 0.02 289)
-
Step 300
300
#BEBED7
oklch(80.9% 0.035 285.6)
-
Step 400
400
#9D9CC2
oklch(70.7% 0.055 286.1)
-
Step 500
500
#8683B3
oklch(63.1% 0.072 287)
-
Step 600
600
#706C9F
oklch(55.6% 0.078 287.1)
-
Step 700
700 (this color)
#666391
oklch(52.1% 0.072 286.6)
-
Step 800
800
#4C4A6E
oklch(42.7% 0.059 286.1)
-
Step 900
900
#403E59
oklch(37.8% 0.046 287.4)
-
Step 950
950
#252434
oklch(26.9% 0.03 287.1)
#666391 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) | #566993 | 0.026 |
| Deuteranopia (no green cones) | #556790 | 0.026 |
| Tritanopia (no blue cones) | #5C6B73 | 0.062 |
| Achromatopsia (no color) | #686868 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666391
#666391
oklch(52.1% 0.072 286.6)
- #6E6C39
#6E6C39
oklch(52.1% 0.072 106.7)
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 #666391, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Purple #805B87 ΔE 0.046
- Dusky Blue #475F94 ΔE 0.047
- Dusty Purple #825F87 ΔE 0.047
- Dark Lavender #856798 ΔE 0.053
- Metallic Blue #4F738E ΔE 0.055
- Grey Purple #826D8C ΔE 0.057
- Dull Purple #84597E ΔE 0.057
- Dull Blue #49759C ΔE 0.058
Use #666391 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.