#6366B2
Closest named color: French Blue (#436BAD). oklch(54.3% 0.117 280), rgb(99, 102, 178).
Aa
White text reads best on this color (5.15:1).
About this color
#6366B2 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.117 and its hue 280°. 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 5.15:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #6366B2 |
| RGB | rgb(99, 102, 178) |
| HSL | hsl(238, 34%, 54%) |
| OKLCH | oklch(54.3% 0.117 280) |
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 #6366B2 | 5.15:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #6366B2 | 4.07:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #6366B2 text on white | 5.15:1 | AA | Lc 75.4 | Fine for body text |
| #6366B2 text on black | 4.07:1 | AA large text | Lc -26.3 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D5D7ED
oklch(88.4% 0.03 281.6)
-
Step 300
300
#B9BEE3
oklch(81% 0.052 279.1)
-
Step 400
400
#969BD5
oklch(70.7% 0.085 280.2)
-
Step 500
500
#7D81CA
oklch(63% 0.109 280.4)
-
Step 600
600 (this color)
#6366B2
oklch(54.3% 0.117 280)
-
Step 700
700
#55589D
oklch(49.1% 0.109 279.7)
-
Step 800
800
#46487F
oklch(42.7% 0.09 280.3)
-
Step 900
900
#3A3D66
oklch(37.7% 0.07 279.3)
-
Step 950
950
#22243C
oklch(27.1% 0.045 279.3)
#6366B2 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) | #4A70B5 | 0.038 |
| Deuteranopia (no green cones) | #456AB0 | 0.039 |
| Tritanopia (no blue cones) | #497683 | 0.104 |
| Achromatopsia (no color) | #6D6D6D | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6366B2
#6366B2
oklch(54.3% 0.117 280)
- #7F7000
#7F7000
oklch(54.2% 0.113 100)
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 #6366B2, closest first.
No curated palette has a color within ΔE 0.04 of #6366B2.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.042
- Iris #6258C4 ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.056
- Light Indigo #6D5ACF ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.060
- Windows Blue #3778BF ΔE 0.063
- Mid Blue #276AB3 ΔE 0.064
Use #6366B2 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.