#666398
Closest named color: Dusky Blue (#475F94). oklch(52.5% 0.083 285.8), rgb(102, 99, 152).
Aa
White text reads best on this color (5.52:1).
About this color
#666398 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.083 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.047 away. White text reads best on it, at 5.52:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.80:1 |
| White text | 5.52:1 |
Values
| HEX | #666398 |
| RGB | rgb(102, 99, 152) |
| HSL | hsl(243, 21%, 49%) |
| OKLCH | oklch(52.5% 0.083 285.8) |
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 #666398 | 5.52:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #666398 | 3.80:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #666398 text on white | 5.52:1 | AA | Lc 77.5 | Fine for body text |
| #666398 text on black | 3.80:1 | AA large text | Lc -24.2 | 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 600.
-
Step 50
50
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E9F1
oklch(93.6% 0.011 286.2)
-
Step 200
200
#D7D7E7
oklch(88.4% 0.022 285.9)
-
Step 300
300
#BEBED8
oklch(81% 0.036 285.6)
-
Step 400
400
#9D9CC5
oklch(70.8% 0.059 285.9)
-
Step 500
500
#8583B6
oklch(63.1% 0.076 285.8)
-
Step 600
600 (this color)
#666398
oklch(52.5% 0.083 285.8)
-
Step 700
700
#5D5A8A
oklch(49.1% 0.076 286.1)
-
Step 800
800
#4C4A70
oklch(42.8% 0.062 285.8)
-
Step 900
900
#3F3E5B
oklch(37.8% 0.049 285.4)
-
Step 950
950
#252435
oklch(26.9% 0.031 286.8)
#666398 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) | #536A9A | 0.031 |
| Deuteranopia (no green cones) | #526797 | 0.029 |
| Tritanopia (no blue cones) | #5A6D76 | 0.072 |
| Achromatopsia (no color) | #696969 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666398
#666398
oklch(52.5% 0.083 285.8)
- #716D30
#716D30
oklch(52.5% 0.082 105.5)
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 #666398, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.047
- Muted Purple #805B87 ΔE 0.049
- Dusty Purple #825F87 ΔE 0.051
- Dark Lavender #856798 ΔE 0.052
- French Blue #436BAD ΔE 0.054
- Dull Blue #49759C ΔE 0.059
- Metallic Blue #4F738E ΔE 0.059
- Muted Blue #3B719F ΔE 0.060
Use #666398 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.