#66579F
Closest named color: Twilight (#4E518B). oklch(50.5% 0.112 291.4), rgb(102, 87, 159).
Aa
White text reads best on this color (6.12:1).
About this color
#66579F is a medium-dark, moderately saturated purple. In OKLCH its lightness is 50%, its chroma 0.112 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.053 away. White text reads best on it, at 6.12:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.112) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.42:1 |
| White text | 6.12:1 |
Values
| HEX | #66579F |
| RGB | rgb(102, 87, 159) |
| HSL | hsl(252, 29%, 48%) |
| OKLCH | oklch(50.5% 0.112 291.4) |
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 #66579F | 6.12:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #66579F | 3.42:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #66579F text on white | 6.12:1 | AA | Lc 80.4 | Fine for body text |
| #66579F text on black | 3.42:1 | AA large text | Lc -21.4 | 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#EAE8F4
oklch(93.6% 0.016 293.7)
-
Step 200
200
#D9D6EC
oklch(88.5% 0.03 292)
-
Step 300
300
#C0BBE2
oklch(80.9% 0.055 291)
-
Step 400
400
#A197D3
oklch(70.7% 0.087 291.6)
-
Step 500
500
#8A7CC7
oklch(63% 0.111 291.4)
-
Step 600
600
#7565B4
oklch(55.7% 0.12 291.3)
-
Step 700
700 (this color)
#66579F
oklch(50.5% 0.112 291.4)
-
Step 800
800
#50447D
oklch(42.6% 0.093 291.6)
-
Step 900
900
#423A65
oklch(37.7% 0.072 291.1)
-
Step 950
950
#27223B
oklch(27% 0.046 292.2)
#66579F 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) | #3F63A2 | 0.058 |
| Deuteranopia (no green cones) | #40609D | 0.056 |
| Tritanopia (no blue cones) | #586573 | 0.093 |
| Achromatopsia (no color) | #626262 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66579F
#66579F
oklch(50.5% 0.112 291.4)
- #676A00
#676A00
oklch(50.5% 0.111 111.7)
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 #66579F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.053
- Dusky Blue #475F94 ΔE 0.053
- Iris #6258C4 ΔE 0.058
- Muted Purple #805B87 ΔE 0.062
- Dusk #4E5481 ΔE 0.063
- Denim Blue #3B5B92 ΔE 0.065
- French Blue #436BAD ΔE 0.066
- Dusty Purple #825F87 ΔE 0.069
Use #66579F 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.