#5566AE
Closest named color: French Blue (#436BAD). oklch(53% 0.115 272), rgb(85, 102, 174).
Aa
White text reads best on this color (5.38:1).
About this color
#5566AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.115 and its hue 272°. 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 5.38:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.89:1 |
| White text | 5.38:1 |
Values
| HEX | #5566AE |
| RGB | rgb(85, 102, 174) |
| HSL | hsl(229, 35%, 51%) |
| OKLCH | oklch(53% 0.115 272) |
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 #5566AE | 5.38:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #5566AE | 3.89:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #5566AE text on white | 5.38:1 | AA | Lc 76.7 | Fine for body text |
| #5566AE text on black | 3.89:1 | AA large text | Lc -25.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D2D8ED
oklch(88.4% 0.03 273.1)
-
Step 300
300
#B5BFE3
oklch(80.9% 0.052 273)
-
Step 400
400
#8E9ED5
oklch(70.7% 0.083 271.6)
-
Step 500
500
#7385CA
oklch(63.1% 0.106 271.9)
-
Step 600
600 (this color)
#5566AE
oklch(53% 0.115 272)
-
Step 700
700
#4C5B9D
oklch(49.1% 0.107 272.3)
-
Step 800
800
#3E4B7F
oklch(42.7% 0.088 271.6)
-
Step 900
900
#353F66
oklch(37.8% 0.068 271.9)
-
Step 950
950
#1F253C
oklch(27% 0.044 272.1)
#5566AE 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) | #496EB1 | 0.024 |
| Deuteranopia (no green cones) | #4067AC | 0.025 |
| Tritanopia (no blue cones) | #2F7581 | 0.102 |
| Achromatopsia (no color) | #6A6A6A | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5566AE
#5566AE
oklch(53% 0.115 272)
- #836900
#836900
oklch(53.1% 0.109 91.7)
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 #5566AE, closest first.
No curated palette has a color within ΔE 0.04 of #5566AE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.024
- Mid Blue #276AB3 ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.046
- Dusky Blue #475F94 ΔE 0.048
- Muted Blue #3B719F ΔE 0.051
- Windows Blue #3778BF ΔE 0.055
- Iris #6258C4 ΔE 0.055
- Dull Blue #49759C ΔE 0.058
Use #5566AE 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.