#6B66C4
Closest named color: Dark Periwinkle (#665FD1). oklch(56% 0.142 283.2), rgb(107, 102, 196).
Aa
White text reads best on this color (4.85:1).
About this color
#6B66C4 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.142 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.030 away. White text reads best on it, at 4.85:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.32:1 |
| White text | 4.85:1 |
Values
| HEX | #6B66C4 |
| RGB | rgb(107, 102, 196) |
| HSL | hsl(243, 44%, 58%) |
| OKLCH | oklch(56% 0.142 283.2) |
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 #6B66C4 | 4.85:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #6B66C4 | 4.32:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #6B66C4 text on white | 4.85:1 | AA | Lc 73.5 | Content text, not long reading |
| #6B66C4 text on black | 4.32:1 | AA large text | Lc -28.2 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F6
oklch(93.7% 0.018 282.5)
-
Step 200
200
#D5D7F1
oklch(88.6% 0.036 282.1)
-
Step 300
300
#BABCE9
oklch(80.9% 0.063 282.9)
-
Step 400
400
#9898DF
oklch(70.7% 0.103 283.5)
-
Step 500
500
#807DD5
oklch(63.1% 0.13 283.6)
-
Step 600
600 (this color)
#6B66C4
oklch(56% 0.142 283.2)
-
Step 700
700
#5853A8
oklch(49% 0.132 283)
-
Step 800
800
#484488
oklch(42.6% 0.11 283.4)
-
Step 900
900
#3C3A6D
oklch(37.7% 0.086 283.3)
-
Step 950
950
#232240
oklch(26.9% 0.055 283.6)
#6B66C4 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) | #3F74C7 | 0.059 |
| Deuteranopia (no green cones) | #3A6EC2 | 0.060 |
| Tritanopia (no blue cones) | #4E7A8C | 0.121 |
| Achromatopsia (no color) | #717171 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B66C4
#6B66C4
oklch(56% 0.142 283.2)
- #817700
#817700
oklch(56.1% 0.118 103.7)
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 #6B66C4, closest first.
No curated palette has a color within ΔE 0.04 of #6B66C4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.034
- Light Indigo #6D5ACF ΔE 0.035
- Iris #6258C4 ΔE 0.039
- Deep Lavender #8D5EB7 ΔE 0.059
- French Blue #436BAD ΔE 0.066
- Royal Blue #4169E1 ΔE 0.067
- Medium Slate Blue #7B68EE ΔE 0.069
Use #6B66C4 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.