#566CB4
Closest named color: French Blue (#436BAD). oklch(54.7% 0.115 269.5), rgb(86, 108, 180).
Aa
White text reads best on this color (5.00:1).
About this color
#566CB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.115 and its hue 269°. 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 (0.115) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #566CB4 |
| RGB | rgb(86, 108, 180) |
| HSL | hsl(226, 39%, 52%) |
| OKLCH | oklch(54.7% 0.115 269.5) |
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 #566CB4 | 5.00:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #566CB4 | 4.19:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #566CB4 text on white | 5.00:1 | AA | Lc 74.4 | Content text, not long reading |
| #566CB4 text on black | 4.19:1 | AA large text | Lc -27.3 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B3C0E3
oklch(80.9% 0.052 269.2)
-
Step 400
400
#8C9FD5
oklch(70.8% 0.082 269.3)
-
Step 500
500
#7086CA
oklch(63.1% 0.106 269.6)
-
Step 600
600 (this color)
#566CB4
oklch(54.7% 0.115 269.5)
-
Step 700
700
#485C9D
oklch(49% 0.107 269.3)
-
Step 800
800
#3C4C80
oklch(42.9% 0.089 269.5)
-
Step 900
900
#333F66
oklch(37.6% 0.069 269.9)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#566CB4 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) | #4F74B7 | 0.022 |
| Deuteranopia (no green cones) | #456CB2 | 0.020 |
| Tritanopia (no blue cones) | #2B7B87 | 0.103 |
| Achromatopsia (no color) | #6F6F6F | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566CB4
#566CB4
oklch(54.7% 0.115 269.5)
- #8B6D00
#8B6D00
oklch(54.9% 0.112 89.6)
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 #566CB4, 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 0.040
- Windows Blue #3778BF ΔE 0.042
- Mid Blue #276AB3 ΔE 0.048
- Muted Blue #3B719F ΔE 0.050
- Dull Blue #49759C ΔE 0.053
- Iris #6258C4 ΔE 0.061
- Steel Blue #4682B4 ΔE 0.062
Use #566CB4 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.