#6366AC
Closest named color: French Blue (#436BAD). oklch(53.9% 0.108 280.2), rgb(99, 102, 172).
Aa
White text reads best on this color (5.21:1).
About this color
#6366AC is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.108 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 5.21:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.02:1 |
| White text | 5.21:1 |
Values
| HEX | #6366AC |
| RGB | rgb(99, 102, 172) |
| HSL | hsl(238, 31%, 53%) |
| OKLCH | oklch(53.9% 0.108 280.2) |
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 #6366AC | 5.21:1 | AA | Lc -81.1 | Fine for body text |
| Black text on #6366AC | 4.02:1 | AA large text | Lc 28.3 | Dividers and decoration only |
| #6366AC text on white | 5.21:1 | AA | Lc 75.8 | Fine for body text |
| #6366AC text on black | 4.02:1 | AA large text | Lc -26.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D5D8EB
oklch(88.6% 0.026 278.7)
-
Step 300
300
#BABEE0
oklch(80.9% 0.048 280)
-
Step 400
400
#979CD1
oklch(70.8% 0.077 280)
-
Step 500
500
#7E82C5
oklch(63.1% 0.1 280.5)
-
Step 600
600 (this color)
#6366AC
oklch(53.9% 0.108 280.2)
-
Step 700
700
#565999
oklch(49.1% 0.101 279.9)
-
Step 800
800
#47497C
oklch(42.8% 0.084 280.5)
-
Step 900
900
#3B3D63
oklch(37.6% 0.065 280.5)
-
Step 950
950
#23243A
oklch(27% 0.041 281.3)
#6366AC 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) | #4D6FAF | 0.035 |
| Deuteranopia (no green cones) | #496AAA | 0.035 |
| Tritanopia (no blue cones) | #4C7481 | 0.094 |
| Achromatopsia (no color) | #6C6C6C | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6366AC
#6366AC
oklch(53.9% 0.108 280.2)
- #7D6F0C
#7D6F0C
oklch(53.9% 0.108 100.2)
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 #6366AC, closest first.
No curated palette has a color within ΔE 0.04 of #6366AC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.041
- Iris #6258C4 ΔE 0.056
- Flat Blue #3C73A8 ΔE 0.056
- Dusky Blue #475F94 ΔE 0.058
- Muted Blue #3B719F ΔE 0.061
- Dull Blue #49759C ΔE 0.062
- Dark Lavender #856798 ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.063
Use #6366AC 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.