#566EA9
Closest named color: French Blue (#436BAD). oklch(54.5% 0.097 266.4), rgb(86, 110, 169).
Aa
White text reads best on this color (5.00:1).
About this color
#566EA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.097 and its hue 266°. 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 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #566EA9 |
| RGB | rgb(86, 110, 169) |
| HSL | hsl(223, 33%, 50%) |
| OKLCH | oklch(54.5% 0.097 266.4) |
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 #566EA9 | 5.00:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #566EA9 | 4.19:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #566EA9 text on white | 5.00:1 | AA | Lc 74.5 | Content text, not long reading |
| #566EA9 text on black | 4.19:1 | AA large text | Lc -27.2 | 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
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C1DE
oklch(81% 0.043 266.3)
-
Step 400
400
#8CA0CD
oklch(70.7% 0.07 266)
-
Step 500
500
#7088C0
oklch(63.1% 0.089 266.1)
-
Step 600
600 (this color)
#566EA9
oklch(54.5% 0.097 266.4)
-
Step 700
700
#495F94
oklch(49.2% 0.089 266.1)
-
Step 800
800
#3C4D78
oklch(42.6% 0.075 266.8)
-
Step 900
900
#334161
oklch(37.8% 0.058 265.6)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#566EA9 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) | #5873AB | 0.014 |
| Deuteranopia (no green cones) | #4F6CA8 | 0.011 |
| Tritanopia (no blue cones) | #347B83 | 0.088 |
| Achromatopsia (no color) | #6F6F6F | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566EA9
#566EA9
oklch(54.5% 0.097 266.4)
- #896C22
#896C22
oklch(54.6% 0.097 86.6)
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 #566EA9, 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 0.030
- Dull Blue #49759C ΔE 0.035
- Muted Blue #3B719F ΔE 0.036
- Windows Blue #3778BF ΔE 0.046
- Stormy Blue #507B9C ΔE 0.048
- Cerulean #457B9D ΔE 0.049
- Metallic Blue #4F738E ΔE 0.050
Use #566EA9 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.