#566FA9
Closest named color: French Blue (#436BAD). oklch(54.8% 0.096 265.6), rgb(86, 111, 169).
Aa
White text reads best on this color (4.95:1).
About this color
#566FA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.096 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.027 away. White text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.24:1 |
| White text | 4.95:1 |
Values
| HEX | #566FA9 |
| RGB | rgb(86, 111, 169) |
| HSL | hsl(222, 33%, 50%) |
| OKLCH | oklch(54.8% 0.096 265.6) |
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 #566FA9 | 4.95:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #566FA9 | 4.24:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #566FA9 text on white | 4.95:1 | AA | Lc 74.2 | Content text, not long reading |
| #566FA9 text on black | 4.24:1 | AA large text | Lc -27.5 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B3C1DD
oklch(80.9% 0.043 264.3)
-
Step 400
400
#8CA0CC
oklch(70.6% 0.069 265.6)
-
Step 500
500
#7088BF
oklch(63% 0.088 265.8)
-
Step 600
600 (this color)
#566FA9
oklch(54.8% 0.096 265.6)
-
Step 700
700
#485F93
oklch(49.1% 0.088 265.2)
-
Step 800
800
#3C4E78
oklch(42.8% 0.074 265.7)
-
Step 900
900
#334160
oklch(37.7% 0.057 265.2)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#566FA9 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) | #5974AB | 0.015 |
| Deuteranopia (no green cones) | #506DA8 | 0.010 |
| Tritanopia (no blue cones) | #337B84 | 0.086 |
| Achromatopsia (no color) | #707070 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566FA9
#566FA9
oklch(54.8% 0.096 265.6)
- #8A6C24
#8A6C24
oklch(54.7% 0.096 85.5)
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 #566FA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.029
- Dull Blue #49759C ΔE 0.034
- Muted Blue #3B719F ΔE 0.035
- Windows Blue #3778BF ΔE 0.045
- Stormy Blue #507B9C ΔE 0.045
- Cerulean #457B9D ΔE 0.047
- Metallic Blue #4F738E ΔE 0.049
Use #566FA9 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.