#66559F
Closest named color: Twilight (#4E518B). oklch(50.1% 0.115 292.3), rgb(102, 85, 159).
Aa
White text reads best on this color (6.24:1).
About this color
#66559F is a medium-dark, moderately saturated purple. In OKLCH its lightness is 50%, its chroma 0.115 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.052 away. White text reads best on it, at 6.24:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.115) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.36:1 |
| White text | 6.24:1 |
Values
| HEX | #66559F |
| RGB | rgb(102, 85, 159) |
| HSL | hsl(254, 30%, 48%) |
| OKLCH | oklch(50.1% 0.115 292.3) |
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 #66559F | 6.24:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #66559F | 3.36:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #66559F text on white | 6.24:1 | AA | Lc 81.0 | Fine for body text |
| #66559F text on black | 3.36:1 | AA large text | Lc -20.9 | 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
#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
#C1BBE2
oklch(81% 0.055 292.2)
-
Step 400
400
#A296D4
oklch(70.6% 0.09 292.8)
-
Step 500
500
#8C7CC8
oklch(63.2% 0.113 292.5)
-
Step 600
600
#7664B5
oklch(55.7% 0.123 292.1)
-
Step 700
700 (this color)
#66559F
oklch(50.1% 0.115 292.3)
-
Step 800
800
#51447E
oklch(42.8% 0.094 292.2)
-
Step 900
900
#433966
oklch(37.7% 0.076 292.6)
-
Step 950
950
#27223B
oklch(27% 0.046 292.2)
#66559F 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) | #3C62A2 | 0.063 |
| Deuteranopia (no green cones) | #3E5F9D | 0.060 |
| Tritanopia (no blue cones) | #586372 | 0.095 |
| Achromatopsia (no color) | #606060 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66559F
#66559F
oklch(50.1% 0.115 292.3)
- #656900
#656900
oklch(50% 0.111 112.4)
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 #66559F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.052
- Dusky Blue #475F94 ΔE 0.056
- Iris #6258C4 ΔE 0.058
- Dusk #4E5481 ΔE 0.063
- Muted Purple #805B87 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.067
- French Blue #436BAD ΔE 0.070
- Slate Blue #6A5ACD ΔE 0.072
Use #66559F 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.