#6366A3
Closest named color: French Blue (#436BAD). oklch(53.4% 0.095 280.5), rgb(99, 102, 163).
Aa
White text reads best on this color (5.30:1).
About this color
#6366A3 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 53%, its chroma 0.095 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.042 away. White text reads best on it, at 5.30:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Values
| HEX | #6366A3 |
| RGB | rgb(99, 102, 163) |
| HSL | hsl(237, 26%, 51%) |
| OKLCH | oklch(53.4% 0.095 280.5) |
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 #6366A3 | 5.30:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #6366A3 | 3.95:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #6366A3 text on white | 5.30:1 | AA | Lc 76.3 | Fine for body text |
| #6366A3 text on black | 3.95:1 | AA large text | Lc -25.4 | 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
#E8E9F2
oklch(93.6% 0.012 281.1)
-
Step 200
200
#D6D8E9
oklch(88.6% 0.023 280.6)
-
Step 300
300
#BBBEDC
oklch(80.9% 0.042 280.9)
-
Step 400
400
#989CCB
oklch(70.6% 0.069 280.7)
-
Step 500
500
#7F83BE
oklch(63% 0.089 280.5)
-
Step 600
600 (this color)
#6366A3
oklch(53.4% 0.095 280.5)
-
Step 700
700
#585A92
oklch(49.1% 0.089 281)
-
Step 800
800
#484A76
oklch(42.7% 0.073 280.9)
-
Step 900
900
#3C3E5F
oklch(37.7% 0.056 280.7)
-
Step 950
950
#232438
oklch(26.9% 0.037 281.4)
#6366A3 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) | #526EA5 | 0.029 |
| Deuteranopia (no green cones) | #4E69A2 | 0.029 |
| Tritanopia (no blue cones) | #50727D | 0.083 |
| Achromatopsia (no color) | #6B6B6B | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6366A3
#6366A3
oklch(53.4% 0.095 280.5)
- #7A6E23
#7A6E23
oklch(53.5% 0.095 100.1)
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 #6366A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.042
- Dusky Blue #475F94 ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.054
- Dull Blue #49759C ΔE 0.055
- Muted Blue #3B719F ΔE 0.055
- Dark Lavender #856798 ΔE 0.057
- Metallic Blue #4F738E ΔE 0.062
- Muted Purple #805B87 ΔE 0.063
Use #6366A3 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.