#66599C
Closest named color: Dusky Blue (#475F94). oklch(50.7% 0.105 291.1), rgb(102, 89, 156).
Aa
White text reads best on this color (6.04:1).
About this color
#66599C is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.105 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.049 away. White text reads best on it, at 6.04:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.105) |
| Temperature | in between |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.47:1 |
| White text | 6.04:1 |
Values
| HEX | #66599C |
| RGB | rgb(102, 89, 156) |
| HSL | hsl(252, 27%, 48%) |
| OKLCH | oklch(50.7% 0.105 291.1) |
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 #66599C | 6.04:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #66599C | 3.47:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #66599C text on white | 6.04:1 | AA | Lc 80.1 | Fine for body text |
| #66599C text on black | 3.47:1 | AA large text | Lc -21.7 | 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 700.
-
Step 50
50
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#E9E8F3
oklch(93.5% 0.015 290.3)
-
Step 200
200
#D9D6EB
oklch(88.5% 0.029 292.4)
-
Step 300
300
#C0BBE0
oklch(80.8% 0.052 291.4)
-
Step 400
400
#A098D0
oklch(70.7% 0.081 290.7)
-
Step 500
500
#8A7EC3
oklch(63.1% 0.103 291.1)
-
Step 600
600
#7466B0
oklch(55.6% 0.113 291)
-
Step 700
700 (this color)
#66599C
oklch(50.7% 0.105 291.1)
-
Step 800
800
#50457B
oklch(42.7% 0.088 291.6)
-
Step 900
900
#423B63
oklch(37.8% 0.067 290.8)
-
Step 950
950
#27233A
oklch(27.2% 0.042 291.3)
#66599C 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) | #44649F | 0.052 |
| Deuteranopia (no green cones) | #45619A | 0.050 |
| Tritanopia (no blue cones) | #596673 | 0.087 |
| Achromatopsia (no color) | #636363 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66599C
#66599C
oklch(50.7% 0.105 291.1)
- #686A12
#686A12
oklch(50.6% 0.104 111)
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 #66599C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.049
- Twilight #4E518B ΔE 0.052
- Muted Purple #805B87 ΔE 0.057
- Dusk #4E5481 ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.063
- Dusty Purple #825F87 ΔE 0.063
- French Blue #436BAD ΔE 0.064
- Iris #6258C4 ΔE 0.064
Use #66599C 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.