#5566AC
Closest named color: French Blue (#436BAD). oklch(52.9% 0.112 271.8), rgb(85, 102, 172).
Aa
White text reads best on this color (5.40:1).
About this color
#5566AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.112 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.023 away. White text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.88:1 |
| White text | 5.40:1 |
Values
| HEX | #5566AC |
| RGB | rgb(85, 102, 172) |
| HSL | hsl(228, 34%, 50%) |
| OKLCH | oklch(52.9% 0.112 271.8) |
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 #5566AC | 5.40:1 | AA | Lc -82.2 | Fine for body text |
| Black text on #5566AC | 3.88:1 | AA large text | Lc 27.2 | Dividers and decoration only |
| #5566AC text on white | 5.40:1 | AA | Lc 76.8 | Fine for body text |
| #5566AC text on black | 3.88:1 | AA large text | Lc -24.9 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B5BFE2
oklch(80.8% 0.051 272.7)
-
Step 400
400
#8F9ED4
oklch(70.8% 0.081 272.2)
-
Step 500
500
#7385C8
oklch(63% 0.103 271.7)
-
Step 600
600 (this color)
#5566AC
oklch(52.9% 0.112 271.8)
-
Step 700
700
#4C5C9B
oklch(49.2% 0.103 271.4)
-
Step 800
800
#3E4B7E
oklch(42.7% 0.086 271.5)
-
Step 900
900
#353F65
oklch(37.7% 0.067 271.7)
-
Step 950
950
#1F253B
oklch(27% 0.042 271.7)
#5566AC 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) | #4A6EAF | 0.024 |
| Deuteranopia (no green cones) | #4267AA | 0.023 |
| Tritanopia (no blue cones) | #307580 | 0.101 |
| Achromatopsia (no color) | #6A6A6A | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5566AC
#5566AC
oklch(52.9% 0.112 271.8)
- #826900
#826900
oklch(53% 0.108 92.4)
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 #5566AC, closest first.
No curated palette has a color within ΔE 0.04 of #5566AC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.045
- Mid Blue #276AB3 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.046
- Muted Blue #3B719F ΔE 0.049
- Dull Blue #49759C ΔE 0.056
- Windows Blue #3778BF ΔE 0.056
- Iris #6258C4 ΔE 0.058
Use #5566AC 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.