#5566B2
Closest named color: French Blue (#436BAD). oklch(53.3% 0.121 272.2), rgb(85, 102, 178).
Aa
White text reads best on this color (5.34:1).
About this color
#5566B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.121 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.026 away. White text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.92:1 |
| White text | 5.34:1 |
Values
| HEX | #5566B2 |
| RGB | rgb(85, 102, 178) |
| HSL | hsl(229, 38%, 52%) |
| OKLCH | oklch(53.3% 0.121 272.2) |
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 #5566B2 | 5.34:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #5566B2 | 3.92:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #5566B2 text on white | 5.34:1 | AA | Lc 76.5 | Fine for body text |
| #5566B2 text on black | 3.92:1 | AA large text | Lc -25.3 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B4BFE5
oklch(80.9% 0.055 272.4)
-
Step 400
400
#8E9DD7
oklch(70.6% 0.087 272.8)
-
Step 500
500
#7284CD
oklch(63% 0.112 272.3)
-
Step 600
600 (this color)
#5566B2
oklch(53.3% 0.121 272.2)
-
Step 700
700
#4B5BA0
oklch(49.2% 0.112 271.9)
-
Step 800
800
#3E4A82
oklch(42.7% 0.094 272.7)
-
Step 900
900
#343E68
oklch(37.6% 0.073 272.3)
-
Step 950
950
#1F253D
oklch(27.1% 0.046 272.4)
#5566B2 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) | #476FB5 | 0.027 |
| Deuteranopia (no green cones) | #3D67B0 | 0.028 |
| Tritanopia (no blue cones) | #2B7683 | 0.107 |
| Achromatopsia (no color) | #6B6B6B | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5566B2
#5566B2
oklch(53.3% 0.121 272.2)
- #836A00
#836A00
oklch(53.3% 0.109 92.5)
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 #5566B2, closest first.
No curated palette has a color within ΔE 0.04 of #5566B2.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.026
- Mid Blue #276AB3 ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.049
- Iris #6258C4 ΔE 0.051
- Windows Blue #3778BF ΔE 0.054
- Dusky Blue #475F94 ΔE 0.054
- Muted Blue #3B719F ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.059
Use #5566B2 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.