#6366AA
Closest named color: French Blue (#436BAD). oklch(53.8% 0.106 280.3), rgb(99, 102, 170).
Aa
White text reads best on this color (5.23:1).
About this color
#6366AA is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.106 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.040 away. White text reads best on it, at 5.23:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.01:1 |
| White text | 5.23:1 |
Values
| HEX | #6366AA |
| RGB | rgb(99, 102, 170) |
| HSL | hsl(237, 29%, 53%) |
| OKLCH | oklch(53.8% 0.106 280.3) |
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 #6366AA | 5.23:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #6366AA | 4.01:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #6366AA text on white | 5.23:1 | AA | Lc 75.9 | Fine for body text |
| #6366AA text on black | 4.01:1 | AA large text | Lc -25.8 | 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
#BABEDF
oklch(80.9% 0.047 279.8)
-
Step 400
400
#979CD0
oklch(70.8% 0.076 280)
-
Step 500
500
#7E83C3
oklch(63.2% 0.096 279.8)
-
Step 600
600 (this color)
#6366AA
oklch(53.8% 0.106 280.3)
-
Step 700
700
#575997
oklch(49.1% 0.098 280.7)
-
Step 800
800
#47497A
oklch(42.7% 0.081 280.6)
-
Step 900
900
#3B3D63
oklch(37.6% 0.065 280.5)
-
Step 950
950
#23243A
oklch(27% 0.041 281.3)
#6366AA 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) | #4E6FAD | 0.034 |
| Deuteranopia (no green cones) | #4A6AA8 | 0.034 |
| Tritanopia (no blue cones) | #4D7480 | 0.093 |
| Achromatopsia (no color) | #6C6C6C | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6366AA
#6366AA
oklch(53.8% 0.106 280.3)
- #7C6F13
#7C6F13
oklch(53.8% 0.106 100.6)
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 #6366AA, closest first.
No curated palette has a color within ΔE 0.04 of #6366AA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.040
- Flat Blue #3C73A8 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.056
- Iris #6258C4 ΔE 0.059
- Muted Blue #3B719F ΔE 0.059
- Dull Blue #49759C ΔE 0.060
- Dark Lavender #856798 ΔE 0.061
- Mid Blue #276AB3 ΔE 0.064
Use #6366AA 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.