#566DB0
Closest named color: French Blue (#436BAD). oklch(54.7% 0.108 268.4), rgb(86, 109, 176).
Aa
White text reads best on this color (4.98:1).
About this color
#566DB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.108 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.024 away. White text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.21:1 |
| White text | 4.98:1 |
Values
| HEX | #566DB0 |
| RGB | rgb(86, 109, 176) |
| HSL | hsl(225, 36%, 51%) |
| OKLCH | oklch(54.7% 0.108 268.4) |
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 #566DB0 | 4.98:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #566DB0 | 4.21:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #566DB0 text on white | 4.98:1 | AA | Lc 74.4 | Content text, not long reading |
| #566DB0 text on black | 4.21:1 | 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
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B3C0E1
oklch(80.9% 0.049 268.3)
-
Step 400
400
#8C9FD2
oklch(70.7% 0.078 268.6)
-
Step 500
500
#7087C6
oklch(63.2% 0.099 268.2)
-
Step 600
600 (this color)
#566DB0
oklch(54.7% 0.108 268.4)
-
Step 700
700
#485D9A
oklch(49% 0.101 268.2)
-
Step 800
800
#3C4C7D
oklch(42.7% 0.084 269)
-
Step 900
900
#334064
oklch(37.7% 0.064 268.1)
-
Step 950
950
#1E263B
oklch(27.2% 0.041 267.7)
#566DB0 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) | #5374B3 | 0.019 |
| Deuteranopia (no green cones) | #496CAF | 0.016 |
| Tritanopia (no blue cones) | #2E7B86 | 0.097 |
| Achromatopsia (no color) | #707070 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566DB0
#566DB0
oklch(54.7% 0.108 268.4)
- #8B6C0C
#8B6C0C
oklch(54.7% 0.108 87.9)
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 #566DB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.024
- Flat Blue #3C73A8 ΔE 0.035
- Windows Blue #3778BF ΔE 0.042
- Muted Blue #3B719F ΔE 0.044
- Dull Blue #49759C ΔE 0.046
- Mid Blue #276AB3 ΔE 0.048
- Stormy Blue #507B9C ΔE 0.057
- Cerulean #457B9D ΔE 0.058
Use #566DB0 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.