#6B66C2
Closest named color: Dark Periwinkle (#665FD1). oklch(55.9% 0.139 283.4), rgb(107, 102, 194).
Aa
White text reads best on this color (4.87:1).
About this color
#6B66C2 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 56%, its chroma 0.139 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.032 away. White text reads best on it, at 4.87:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.30:1 |
| White text | 4.87:1 |
Values
| HEX | #6B66C2 |
| RGB | rgb(107, 102, 194) |
| HSL | hsl(243, 43%, 58%) |
| OKLCH | oklch(55.9% 0.139 283.4) |
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 #6B66C2 | 4.87:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #6B66C2 | 4.30:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #6B66C2 text on white | 4.87:1 | AA | Lc 73.6 | Content text, not long reading |
| #6B66C2 text on black | 4.30:1 | AA large text | Lc -28.1 | 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
#D5D7F0
oklch(88.5% 0.034 282)
-
Step 300
300
#BBBCE9
oklch(81% 0.063 283.9)
-
Step 400
400
#9898DD
oklch(70.6% 0.1 283.5)
-
Step 500
500
#807DD4
oklch(63% 0.129 283.6)
-
Step 600
600 (this color)
#6B66C2
oklch(55.9% 0.139 283.4)
-
Step 700
700
#5953A7
oklch(49.1% 0.131 283.7)
-
Step 800
800
#484587
oklch(42.7% 0.107 283)
-
Step 900
900
#3C3A6C
oklch(37.6% 0.084 283.4)
-
Step 950
950
#23223F
oklch(26.9% 0.053 283.8)
#6B66C2 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) | #4074C5 | 0.059 |
| Deuteranopia (no green cones) | #3C6EC0 | 0.059 |
| Tritanopia (no blue cones) | #4F798B | 0.118 |
| Achromatopsia (no color) | #717171 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B66C2
#6B66C2
oklch(55.9% 0.139 283.4)
- #817600
#817600
oklch(55.8% 0.117 103)
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 #6B66C2, closest first.
No curated palette has a color within ΔE 0.04 of #6B66C2.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.032
- Slate Blue #6A5ACD ΔE 0.036
- Light Indigo #6D5ACF ΔE 0.037
- Iris #6258C4 ΔE 0.040
- Deep Lavender #8D5EB7 ΔE 0.058
- French Blue #436BAD ΔE 0.064
- Royal Blue #4169E1 ΔE 0.069
- Medium Slate Blue #7B68EE ΔE 0.072
Use #6B66C2 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.