#6D66BF
Closest named color: Dark Periwinkle (#665FD1). oklch(55.9% 0.135 284.7), rgb(109, 102, 191).
Aa
White text reads best on this color (4.88:1).
About this color
#6D66BF is a medium-dark, moderately saturated purple. In OKLCH its lightness is 56%, its chroma 0.135 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.037 away. White text reads best on it, at 4.88:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.30:1 |
| White text | 4.88:1 |
Values
| HEX | #6D66BF |
| RGB | rgb(109, 102, 191) |
| HSL | hsl(245, 41%, 57%) |
| OKLCH | oklch(55.9% 0.135 284.7) |
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 #6D66BF | 4.88:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #6D66BF | 4.30:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #6D66BF text on white | 4.88:1 | AA | Lc 73.7 | Content text, not long reading |
| #6D66BF text on black | 4.30:1 | AA large text | Lc -28.0 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D7EF
oklch(88.6% 0.033 283.8)
-
Step 300
300
#BCBCE7
oklch(81% 0.06 285)
-
Step 400
400
#9A98DB
oklch(70.7% 0.097 285)
-
Step 500
500
#827DD1
oklch(63% 0.124 284.9)
-
Step 600
600 (this color)
#6D66BF
oklch(55.9% 0.135 284.7)
-
Step 700
700
#5B54A4
oklch(49.2% 0.125 284.8)
-
Step 800
800
#4A4585
oklch(42.8% 0.103 284.7)
-
Step 900
900
#3D3A6A
oklch(37.6% 0.081 284.7)
-
Step 950
950
#24223E
oklch(26.9% 0.051 285.7)
#6D66BF 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) | #4374C2 | 0.059 |
| Deuteranopia (no green cones) | #406EBD | 0.058 |
| Tritanopia (no blue cones) | #547889 | 0.115 |
| Achromatopsia (no color) | #717171 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6D66BF
#6D66BF
oklch(55.9% 0.135 284.7)
- #7F7700
#7F7700
oklch(55.9% 0.118 104.9)
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 #6D66BF, closest first.
No curated palette has a color within ΔE 0.04 of #6D66BF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.037
- Slate Blue #6A5ACD ΔE 0.040
- Light Indigo #6D5ACF ΔE 0.041
- Iris #6258C4 ΔE 0.042
- Deep Lavender #8D5EB7 ΔE 0.054
- French Blue #436BAD ΔE 0.064
- Deep Lilac #966EBD ΔE 0.071
- Dark Lavender #856798 ΔE 0.072
Use #6D66BF 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.