#566CA4
Closest named color: French Blue (#436BAD). oklch(53.8% 0.092 267), rgb(86, 108, 164).
Aa
White text reads best on this color (5.15:1).
About this color
#566CA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.092 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.026 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #566CA4 |
| RGB | rgb(86, 108, 164) |
| HSL | hsl(223, 31%, 49%) |
| OKLCH | oklch(53.8% 0.092 267) |
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 #566CA4 | 5.15:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #566CA4 | 4.07:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #566CA4 text on white | 5.15:1 | AA | Lc 75.4 | Fine for body text |
| #566CA4 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B5C0DC
oklch(80.8% 0.041 268.5)
-
Step 400
400
#8EA0CB
oklch(70.7% 0.066 267)
-
Step 500
500
#7288BD
oklch(63.1% 0.084 266.7)
-
Step 600
600 (this color)
#566CA4
oklch(53.8% 0.092 267)
-
Step 700
700
#4B5F92
oklch(49.2% 0.086 267)
-
Step 800
800
#3D4D76
oklch(42.6% 0.071 267.1)
-
Step 900
900
#34415F
oklch(37.8% 0.054 265.9)
-
Step 950
950
#1F2638
oklch(27.1% 0.035 267.7)
#566CA4 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) | #5771A6 | 0.014 |
| Deuteranopia (no green cones) | #4F6AA3 | 0.011 |
| Tritanopia (no blue cones) | #387880 | 0.083 |
| Achromatopsia (no color) | #6D6D6D | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566CA4
#566CA4
oklch(53.8% 0.092 267)
- #856A26
#856A26
oklch(53.8% 0.092 86.8)
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 #566CA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.031
- Muted Blue #3B719F ΔE 0.034
- Dull Blue #49759C ΔE 0.034
- Metallic Blue #4F738E ΔE 0.046
- Dusky Blue #475F94 ΔE 0.048
- Stormy Blue #507B9C ΔE 0.049
- Cerulean #457B9D ΔE 0.050
Use #566CA4 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.