#566CB5
Closest named color: French Blue (#436BAD). oklch(54.8% 0.117 269.6), rgb(86, 108, 181).
Aa
White text reads best on this color (4.99:1).
About this color
#566CB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.117 and its hue 270°. 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 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.20:1 |
| White text | 4.99:1 |
Values
| HEX | #566CB5 |
| RGB | rgb(86, 108, 181) |
| HSL | hsl(226, 39%, 52%) |
| OKLCH | oklch(54.8% 0.117 269.6) |
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 #566CB5 | 4.99:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #566CB5 | 4.20:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #566CB5 text on white | 4.99:1 | AA | Lc 74.4 | Content text, not long reading |
| #566CB5 text on black | 4.20:1 | 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
#B3C0E4
oklch(81% 0.053 269.6)
-
Step 400
400
#8C9ED6
oklch(70.6% 0.085 270.4)
-
Step 500
500
#7086CB
oklch(63.2% 0.107 269.7)
-
Step 600
600 (this color)
#566CB5
oklch(54.8% 0.117 269.6)
-
Step 700
700
#485C9E
oklch(49.1% 0.109 269.4)
-
Step 800
800
#3B4B80
oklch(42.6% 0.09 269.6)
-
Step 900
900
#333F67
oklch(37.7% 0.07 270.1)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#566CB5 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) | #4F74B8 | 0.022 |
| Deuteranopia (no green cones) | #446CB3 | 0.021 |
| Tritanopia (no blue cones) | #2A7C88 | 0.104 |
| Achromatopsia (no color) | #6F6F6F | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566CB5
#566CB5
oklch(54.8% 0.117 269.6)
- #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 #566CB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.027
- Windows Blue #3778BF ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.041
- Mid Blue #276AB3 ΔE 0.048
- Muted Blue #3B719F ΔE 0.051
- Dull Blue #49759C ΔE 0.054
- Iris #6258C4 ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.062
Use #566CB5 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.