#6B66BD
Closest named color: Dark Periwinkle (#665FD1). oklch(55.6% 0.132 283.8), rgb(107, 102, 189).
Aa
White text reads best on this color (4.92:1).
About this color
#6B66BD is a medium-dark, moderately saturated purple. In OKLCH its lightness is 56%, its chroma 0.132 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.039 away. White text reads best on it, at 4.92:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #6B66BD |
| RGB | rgb(107, 102, 189) |
| HSL | hsl(243, 40%, 57%) |
| OKLCH | oklch(55.6% 0.132 283.8) |
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 #6B66BD | 4.92:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #6B66BD | 4.26:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #6B66BD text on white | 4.92:1 | AA | Lc 74.0 | Content text, not long reading |
| #6B66BD text on black | 4.26:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F5
oklch(93.7% 0.016 282.3)
-
Step 200
200
#D6D7EF
oklch(88.6% 0.033 283.8)
-
Step 300
300
#BBBCE6
oklch(80.8% 0.059 283.9)
-
Step 400
400
#9999DA
oklch(70.8% 0.094 283.7)
-
Step 500
500
#817ED0
oklch(63.1% 0.122 284)
-
Step 600
600 (this color)
#6B66BD
oklch(55.6% 0.132 283.8)
-
Step 700
700
#5954A3
oklch(49% 0.123 283.7)
-
Step 800
800
#494584
oklch(42.6% 0.102 284.1)
-
Step 900
900
#3D3B6A
oklch(37.8% 0.079 283.9)
-
Step 950
950
#23233E
oklch(27% 0.05 282.6)
#6B66BD 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) | #4473C0 | 0.055 |
| Deuteranopia (no green cones) | #416EBB | 0.054 |
| Tritanopia (no blue cones) | #527888 | 0.114 |
| Achromatopsia (no color) | #707070 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B66BD
#6B66BD
oklch(55.6% 0.132 283.8)
- #7F7600
#7F7600
oklch(55.6% 0.118 104.3)
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 #6B66BD, closest first.
No curated palette has a color within ΔE 0.04 of #6B66BD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.039
- Slate Blue #6A5ACD ΔE 0.041
- Iris #6258C4 ΔE 0.042
- Light Indigo #6D5ACF ΔE 0.043
- Deep Lavender #8D5EB7 ΔE 0.057
- French Blue #436BAD ΔE 0.060
- Windows Blue #3778BF ΔE 0.070
- Dark Lavender #856798 ΔE 0.071
Use #6B66BD 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.