#6C66BB
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.129 284.6), rgb(108, 102, 187).
Aa
White text reads best on this color (4.93:1).
About this color
#6C66BB is a medium-dark, moderately saturated purple. In OKLCH its lightness is 56%, its chroma 0.129 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.042 away. White text reads best on it, at 4.93:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.25:1 |
| White text | 4.93:1 |
Values
| HEX | #6C66BB |
| RGB | rgb(108, 102, 187) |
| HSL | hsl(244, 38%, 57%) |
| OKLCH | oklch(55.5% 0.129 284.6) |
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 #6C66BB | 4.93:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #6C66BB | 4.25:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #6C66BB text on white | 4.93:1 | AA | Lc 74.0 | Content text, not long reading |
| #6C66BB text on black | 4.25:1 | AA large text | Lc -27.7 | 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 600.
-
Step 50
50
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E9F5
oklch(93.7% 0.016 282.3)
-
Step 200
200
#D6D7EE
oklch(88.5% 0.031 283.8)
-
Step 300
300
#BCBCE5
oklch(80.9% 0.058 285)
-
Step 400
400
#9A99D9
oklch(70.8% 0.093 284.5)
-
Step 500
500
#827ECE
oklch(63% 0.119 284.7)
-
Step 600
600 (this color)
#6C66BB
oklch(55.5% 0.129 284.6)
-
Step 700
700
#5A55A1
oklch(49.1% 0.119 284.1)
-
Step 800
800
#4A4583
oklch(42.6% 0.1 285)
-
Step 900
900
#3D3B69
oklch(37.7% 0.077 284)
-
Step 950
950
#24233D
oklch(27.1% 0.048 284.5)
#6C66BB 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) | #4673BE | 0.055 |
| Deuteranopia (no green cones) | #436EB9 | 0.054 |
| Tritanopia (no blue cones) | #547787 | 0.111 |
| Achromatopsia (no color) | #707070 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6C66BB
#6C66BB
oklch(55.5% 0.129 284.6)
- #7E7600
#7E7600
oklch(55.5% 0.118 104.9)
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 #6C66BB, closest first.
No curated palette has a color within ΔE 0.04 of #6C66BB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.042
- Slate Blue #6A5ACD ΔE 0.044
- Iris #6258C4 ΔE 0.044
- Light Indigo #6D5ACF ΔE 0.046
- Deep Lavender #8D5EB7 ΔE 0.055
- French Blue #436BAD ΔE 0.060
- Dark Lavender #856798 ΔE 0.068
- Windows Blue #3778BF ΔE 0.071
Use #6C66BB 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.