#6663AB
Closest named color: French Blue (#436BAD). oklch(53.5% 0.111 283.9), rgb(102, 99, 171).
Aa
White text reads best on this color (5.33:1).
About this color
#6663AB is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.111 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.047 away. White text reads best on it, at 5.33:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #6663AB |
| RGB | rgb(102, 99, 171) |
| HSL | hsl(243, 30%, 53%) |
| OKLCH | oklch(53.5% 0.111 283.9) |
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 #6663AB | 5.33:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #6663AB | 3.93:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #6663AB text on white | 5.33:1 | AA | Lc 76.4 | Fine for body text |
| #6663AB text on black | 3.93:1 | AA large text | Lc -25.3 | 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D6D7EB
oklch(88.4% 0.027 283.5)
-
Step 300
300
#BCBDE1
oklch(80.9% 0.051 284)
-
Step 400
400
#9A9AD1
oklch(70.6% 0.08 284.2)
-
Step 500
500
#8281C5
oklch(63.2% 0.101 283.8)
-
Step 600
600 (this color)
#6663AB
oklch(53.5% 0.111 283.9)
-
Step 700
700
#5A5799
oklch(49% 0.104 283.9)
-
Step 800
800
#4A487C
oklch(42.8% 0.085 284)
-
Step 900
900
#3D3C64
oklch(37.6% 0.068 283.8)
-
Step 950
950
#24233A
oklch(26.9% 0.042 285.2)
#6663AB 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) | #4A6DAE | 0.042 |
| Deuteranopia (no green cones) | #4769A9 | 0.043 |
| Tritanopia (no blue cones) | #52717F | 0.095 |
| Achromatopsia (no color) | #6B6B6B | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6663AB
#6663AB
oklch(53.5% 0.111 283.9)
- #797006
#797006
oklch(53.7% 0.111 103.8)
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 #6663AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.047
- Iris #6258C4 ΔE 0.052
- Dusky Blue #475F94 ΔE 0.059
- Dark Lavender #856798 ΔE 0.061
- Slate Blue #6A5ACD ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.062
- Flat Blue #3C73A8 ΔE 0.064
- Light Indigo #6D5ACF ΔE 0.064
Use #6663AB 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.