#566BB8
Closest named color: French Blue (#436BAD). oklch(54.8% 0.123 270.4), rgb(86, 107, 184).
Aa
White text reads best on this color (5.01:1).
About this color
#566BB8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.123 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.029 away. White text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.19:1 |
| White text | 5.01:1 |
Values
| HEX | #566BB8 |
| RGB | rgb(86, 107, 184) |
| HSL | hsl(227, 41%, 53%) |
| OKLCH | oklch(54.8% 0.123 270.4) |
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 #566BB8 | 5.01:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #566BB8 | 4.19:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #566BB8 text on white | 5.01:1 | AA | Lc 74.5 | Content text, not long reading |
| #566BB8 text on black | 4.19:1 | AA large text | Lc -27.2 | 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
#E6EAF5
oklch(93.7% 0.015 270)
-
Step 200
200
#D1D9EE
oklch(88.6% 0.03 269.1)
-
Step 300
300
#B3C0E5
oklch(81% 0.054 269.9)
-
Step 400
400
#8B9ED8
oklch(70.7% 0.088 270.1)
-
Step 500
500
#7085CE
oklch(63.1% 0.113 270.7)
-
Step 600
600 (this color)
#566BB8
oklch(54.8% 0.123 270.4)
-
Step 700
700
#485BA1
oklch(49% 0.114 270.3)
-
Step 800
800
#3B4B82
oklch(42.7% 0.094 269.9)
-
Step 900
900
#333F69
oklch(37.8% 0.074 270.5)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#566BB8 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) | #4B74BB | 0.025 |
| Deuteranopia (no green cones) | #406BB6 | 0.026 |
| Tritanopia (no blue cones) | #277C88 | 0.111 |
| Achromatopsia (no color) | #6F6F6F | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566BB8
#566BB8
oklch(54.8% 0.123 270.4)
- #8A6D00
#8A6D00
oklch(54.8% 0.112 90.2)
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 #566BB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.029
- Windows Blue #3778BF ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.048
- Iris #6258C4 ΔE 0.055
- Muted Blue #3B719F ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.056
- Dull Blue #49759C ΔE 0.060
Use #566BB8 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.