#6663AA
Closest named color: French Blue (#436BAD). oklch(53.5% 0.11 284), rgb(102, 99, 170).
Aa
White text reads best on this color (5.34:1).
About this color
#6663AA is a medium-dark, moderately saturated purple. In OKLCH its lightness is 53%, its chroma 0.110 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 5.34:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.93:1 |
| White text | 5.34:1 |
Values
| HEX | #6663AA |
| RGB | rgb(102, 99, 170) |
| HSL | hsl(243, 29%, 53%) |
| OKLCH | oklch(53.5% 0.11 284) |
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 #6663AA | 5.34:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #6663AA | 3.93:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #6663AA text on white | 5.34:1 | AA | Lc 76.5 | Fine for body text |
| #6663AA text on black | 3.93:1 | AA large text | Lc -25.2 | 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
#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
#BCBDE0
oklch(80.9% 0.049 284)
-
Step 400
400
#9A9AD1
oklch(70.6% 0.08 284.2)
-
Step 500
500
#8281C4
oklch(63.1% 0.1 283.8)
-
Step 600
600 (this color)
#6663AA
oklch(53.5% 0.11 284)
-
Step 700
700
#5A5798
oklch(49% 0.102 284)
-
Step 800
800
#4A487B
oklch(42.8% 0.083 284.1)
-
Step 900
900
#3D3C63
oklch(37.6% 0.066 283.9)
-
Step 950
950
#24243A
oklch(27.1% 0.041 283.4)
#6663AA 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) | #4A6DAD | 0.042 |
| Deuteranopia (no green cones) | #4869A8 | 0.042 |
| Tritanopia (no blue cones) | #52717E | 0.095 |
| Achromatopsia (no color) | #6B6B6B | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6663AA
#6663AA
oklch(53.5% 0.11 284)
- #786F0B
#786F0B
oklch(53.3% 0.109 103.7)
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 #6663AA, 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 0.054
- Dusky Blue #475F94 ΔE 0.058
- Dark Lavender #856798 ΔE 0.060
- Slate Blue #6A5ACD ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.063
- Flat Blue #3C73A8 ΔE 0.064
- Light Indigo #6D5ACF ΔE 0.066
Use #6663AA 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.