#6B66CF
Closest named color: Dark Periwinkle (#665FD1). oklch(56.7% 0.157 282.3), rgb(107, 102, 207).
Aa
White text reads best on this color (4.74:1).
About this color
#6B66CF is a medium-dark, vivid purple. In OKLCH its lightness is 57%, its chroma 0.157 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.020 away. White text reads best on it, at 4.74:1.
| Hue family | Purples |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #6B66CF |
| RGB | rgb(107, 102, 207) |
| HSL | hsl(243, 52%, 61%) |
| OKLCH | oklch(56.7% 0.157 282.3) |
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 #6B66CF | 4.74:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #6B66CF | 4.42:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #6B66CF text on white | 4.74:1 | AA | Lc 72.7 | Content text, not long reading |
| #6B66CF text on black | 4.42:1 | AA large text | Lc -29.0 | 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
#E7E8F8
oklch(93.5% 0.022 283.1)
-
Step 200
200
#D4D7F3
oklch(88.6% 0.039 280.7)
-
Step 300
300
#B9BCEE
oklch(81% 0.07 282)
-
Step 400
400
#9697E5
oklch(70.7% 0.113 282.5)
-
Step 500
500
#7D7CDE
oklch(63.2% 0.145 281.9)
-
Step 600
600 (this color)
#6B66CF
oklch(56.7% 0.157 282.3)
-
Step 700
700
#5751B0
oklch(49.1% 0.146 282.4)
-
Step 800
800
#47438E
oklch(42.7% 0.12 282.4)
-
Step 900
900
#3B3972
oklch(37.7% 0.095 282.4)
-
Step 950
950
#222243
oklch(27% 0.06 281.6)
#6B66CF 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) | #3477D3 | 0.069 |
| Deuteranopia (no green cones) | #2D6FCD | 0.069 |
| Tritanopia (no blue cones) | #477D91 | 0.135 |
| Achromatopsia (no color) | #737373 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B66CF
#6B66CF
oklch(56.7% 0.157 282.3)
- #857800
#857800
oklch(56.7% 0.119 101.9)
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 #6B66CF, closest first.
No curated palette has a color within ΔE 0.04 of #6B66CF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.020
- Light Indigo #6D5ACF ΔE 0.029
- Slate Blue #6A5ACD ΔE 0.029
- Iris #6258C4 ΔE 0.041
- Medium Slate Blue #7B68EE ΔE 0.053
- Royal Blue #4169E1 ΔE 0.057
- Purpley #8756E4 ΔE 0.064
- Warm Blue #4B57DB ΔE 0.065
Use #6B66CF 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.