#566FBF
Closest named color: Windows Blue (#3778BF). oklch(56% 0.127 268.9), rgb(86, 111, 191).
Aa
White text reads best on this color (4.74:1).
About this color
#566FBF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.127 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #566FBF |
| RGB | rgb(86, 111, 191) |
| HSL | hsl(226, 45%, 54%) |
| OKLCH | oklch(56% 0.127 268.9) |
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 #566FBF | 4.74:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #566FBF | 4.42:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #566FBF text on white | 4.74:1 | AA | Lc 72.8 | Content text, not long reading |
| #566FBF text on black | 4.42:1 | AA large text | Lc -28.9 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B1C0E7
oklch(80.9% 0.058 268.6)
-
Step 400
400
#899EDB
oklch(70.7% 0.093 269.3)
-
Step 500
500
#6C85D1
oklch(63% 0.118 269)
-
Step 600
600 (this color)
#566FBF
oklch(56% 0.127 268.9)
-
Step 700
700
#455BA4
oklch(49% 0.12 269)
-
Step 800
800
#394B85
oklch(42.8% 0.099 269)
-
Step 900
900
#313F6A
oklch(37.7% 0.076 268.9)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#566FBF 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) | #4D78C2 | 0.025 |
| Deuteranopia (no green cones) | #416FBD | 0.024 |
| Tritanopia (no blue cones) | #1C808E | 0.113 |
| Achromatopsia (no color) | #737373 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566FBF
#566FBF
oklch(56% 0.127 268.9)
- #907000
#907000
oklch(56.1% 0.115 88.7)
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 #566FBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- French Blue #436BAD ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.050
- Mid Blue #276AB3 ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.055
- Steel Blue #4682B4 ΔE 0.060
- Iris #6258C4 ΔE 0.061
- Royal Blue #4169E1 ΔE 0.061
Use #566FBF 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.