#566DBB
Closest named color: French Blue (#436BAD). oklch(55.4% 0.124 269.6), rgb(86, 109, 187).
Aa
White text reads best on this color (4.88:1).
About this color
#566DBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.124 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.033 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.30:1 |
| White text | 4.88:1 |
Values
| HEX | #566DBB |
| RGB | rgb(86, 109, 187) |
| HSL | hsl(226, 43%, 54%) |
| OKLCH | oklch(55.4% 0.124 269.6) |
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 #566DBB | 4.88:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #566DBB | 4.30:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #566DBB text on white | 4.88:1 | AA | Lc 73.7 | Content text, not long reading |
| #566DBB text on black | 4.30:1 | AA large text | Lc -28.0 | 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
#D1D9EE
oklch(88.6% 0.03 269.1)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#8A9ED9
oklch(70.6% 0.09 269.6)
-
Step 500
500
#6E85CF
oklch(63.1% 0.115 269.8)
-
Step 600
600 (this color)
#566DBB
oklch(55.4% 0.124 269.6)
-
Step 700
700
#475BA2
oklch(49% 0.116 269.9)
-
Step 800
800
#3A4B83
oklch(42.7% 0.095 269.3)
-
Step 900
900
#323F69
oklch(37.7% 0.074 269.6)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#566DBB 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) | #4D76BE | 0.025 |
| Deuteranopia (no green cones) | #416DB9 | 0.024 |
| Tritanopia (no blue cones) | #227E8B | 0.111 |
| Achromatopsia (no color) | #717171 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566DBB
#566DBB
oklch(55.4% 0.124 269.6)
- #8D6E00
#8D6E00
oklch(55.3% 0.113 89.1)
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 #566DBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.033
- Windows Blue #3778BF ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.050
- Dark Periwinkle #665FD1 ΔE 0.056
- Muted Blue #3B719F ΔE 0.058
- Iris #6258C4 ΔE 0.058
- Dull Blue #49759C ΔE 0.061
Use #566DBB 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.