#6366A6
Closest named color: French Blue (#436BAD). oklch(53.6% 0.1 280.4), rgb(99, 102, 166).
Aa
White text reads best on this color (5.27:1).
About this color
#6366A6 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.100 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.041 away. White text reads best on it, at 5.27:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.98:1 |
| White text | 5.27:1 |
Values
| HEX | #6366A6 |
| RGB | rgb(99, 102, 166) |
| HSL | hsl(237, 27%, 52%) |
| OKLCH | oklch(53.6% 0.1 280.4) |
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 #6366A6 | 5.27:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #6366A6 | 3.98:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #6366A6 text on white | 5.27:1 | AA | Lc 76.1 | Fine for body text |
| #6366A6 text on black | 3.98:1 | AA large text | Lc -25.6 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D5D8EA
oklch(88.5% 0.025 278.3)
-
Step 300
300
#BBBEDE
oklch(81% 0.045 281.1)
-
Step 400
400
#989CCD
oklch(70.7% 0.072 280.8)
-
Step 500
500
#7F83C0
oklch(63.1% 0.092 280.5)
-
Step 600
600 (this color)
#6366A6
oklch(53.6% 0.1 280.4)
-
Step 700
700
#575A94
oklch(49.1% 0.092 280.2)
-
Step 800
800
#474A78
oklch(42.8% 0.076 279.8)
-
Step 900
900
#3C3E61
oklch(37.8% 0.06 280.6)
-
Step 950
950
#232439
oklch(27% 0.039 281.4)
#6366A6 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) | #506EA9 | 0.031 |
| Deuteranopia (no green cones) | #4D69A4 | 0.030 |
| Tritanopia (no blue cones) | #4F737E | 0.088 |
| Achromatopsia (no color) | #6C6C6C | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6366A6
#6366A6
oklch(53.6% 0.1 280.4)
- #7B6F1D
#7B6F1D
oklch(53.7% 0.1 100.7)
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 #6366A6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.041
- Dusky Blue #475F94 ΔE 0.053
- Flat Blue #3C73A8 ΔE 0.054
- Dull Blue #49759C ΔE 0.057
- Muted Blue #3B719F ΔE 0.057
- Dark Lavender #856798 ΔE 0.058
- Iris #6258C4 ΔE 0.064
- Metallic Blue #4F738E ΔE 0.065
Use #6366A6 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.