#566FC3
Closest named color: Windows Blue (#3778BF). oklch(56.3% 0.133 269.3), rgb(86, 111, 195).
Aa
White text reads best on this color (4.71:1).
About this color
#566FC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.133 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.038 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #566FC3 |
| RGB | rgb(86, 111, 195) |
| HSL | hsl(226, 48%, 55%) |
| OKLCH | oklch(56.3% 0.133 269.3) |
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 #566FC3 | 4.71:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #566FC3 | 4.45:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #566FC3 text on white | 4.71:1 | AA | Lc 72.5 | Content text, not long reading |
| #566FC3 text on black | 4.45:1 | AA large text | Lc -29.2 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1C0E8
oklch(81% 0.059 268.9)
-
Step 400
400
#889EDD
oklch(70.7% 0.096 269.1)
-
Step 500
500
#6C85D4
oklch(63.2% 0.123 269.4)
-
Step 600
600 (this color)
#566FC3
oklch(56.3% 0.133 269.3)
-
Step 700
700
#455BA6
oklch(49.2% 0.123 269.2)
-
Step 800
800
#394A87
oklch(42.7% 0.103 269.9)
-
Step 900
900
#303F6C
oklch(37.8% 0.08 268.5)
-
Step 950
950
#1C253F
oklch(27% 0.05 268.4)
#566FC3 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) | #4B79C6 | 0.027 |
| Deuteranopia (no green cones) | #3D6FC1 | 0.027 |
| Tritanopia (no blue cones) | #14818F | 0.119 |
| Achromatopsia (no color) | #737373 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566FC3
#566FC3
oklch(56.3% 0.133 269.3)
- #907100
#907100
oklch(56.3% 0.115 89.5)
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 #566FC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.038
- French Blue #436BAD ΔE 0.043
- Dark Periwinkle #665FD1 ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.056
- Mid Blue #276AB3 ΔE 0.056
- Iris #6258C4 ΔE 0.059
- Slate Blue #6A5ACD ΔE 0.060
Use #566FC3 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.