#6B66CD
Closest named color: Dark Periwinkle (#665FD1). oklch(56.6% 0.154 282.5), rgb(107, 102, 205).
Aa
White text reads best on this color (4.76:1).
About this color
#6B66CD is a medium-dark, vivid purple. In OKLCH its lightness is 57%, its chroma 0.154 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.021 away. White text reads best on it, at 4.76:1.
| Hue family | Purples |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #6B66CD |
| RGB | rgb(107, 102, 205) |
| HSL | hsl(243, 51%, 60%) |
| OKLCH | oklch(56.6% 0.154 282.5) |
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 #6B66CD | 4.76:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #6B66CD | 4.40:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #6B66CD text on white | 4.76:1 | AA | Lc 72.9 | Content text, not long reading |
| #6B66CD text on black | 4.40:1 | AA large text | Lc -28.8 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F7
oklch(93.5% 0.02 282.9)
-
Step 200
200
#D5D7F3
oklch(88.6% 0.038 282.3)
-
Step 300
300
#B9BCED
oklch(81% 0.069 282)
-
Step 400
400
#9697E4
oklch(70.6% 0.112 282.6)
-
Step 500
500
#7E7CDC
oklch(63.1% 0.142 282.5)
-
Step 600
600 (this color)
#6B66CD
oklch(56.6% 0.154 282.5)
-
Step 700
700
#5751AE
oklch(49% 0.144 282.6)
-
Step 800
800
#47438D
oklch(42.6% 0.119 282.6)
-
Step 900
900
#3B3971
oklch(37.6% 0.094 282.5)
-
Step 950
950
#222242
oklch(27% 0.059 281.7)
#6B66CD 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) | #3676D1 | 0.066 |
| Deuteranopia (no green cones) | #306FCB | 0.067 |
| Tritanopia (no blue cones) | #487C90 | 0.132 |
| Achromatopsia (no color) | #737373 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B66CD
#6B66CD
oklch(56.6% 0.154 282.5)
- #847800
#847800
oklch(56.6% 0.119 102.5)
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 #6B66CD, closest first.
No curated palette has a color within ΔE 0.04 of #6B66CD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.021
- Light Indigo #6D5ACF ΔE 0.029
- Slate Blue #6A5ACD ΔE 0.029
- Iris #6258C4 ΔE 0.040
- Medium Slate Blue #7B68EE ΔE 0.056
- Royal Blue #4169E1 ΔE 0.059
- Deep Lavender #8D5EB7 ΔE 0.064
- Warm Blue #4B57DB ΔE 0.066
Use #6B66CD 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.