#556599
Closest named color: Dusky Blue (#475F94). oklch(51.6% 0.085 270.2), rgb(85, 101, 153).
Aa
White text reads best on this color (5.66:1).
About this color
#556599 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.085 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.027 away. White text reads best on it, at 5.66:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.70:1 |
| White text | 5.66:1 |
Values
| HEX | #556599 |
| RGB | rgb(85, 101, 153) |
| HSL | hsl(226, 29%, 47%) |
| OKLCH | oklch(51.6% 0.085 270.2) |
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 #556599 | 5.66:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #556599 | 3.70:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #556599 text on white | 5.66:1 | AA | Lc 78.3 | Fine for body text |
| #556599 text on black | 3.70:1 | AA large text | Lc -23.5 | 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 700.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF2
oklch(93.7% 0.011 269.5)
-
Step 200
200
#D3D9E9
oklch(88.6% 0.023 269.4)
-
Step 300
300
#B6C0DC
oklch(80.9% 0.041 269.9)
-
Step 400
400
#919FCA
oklch(70.7% 0.065 270.6)
-
Step 500
500
#7687BD
oklch(63.1% 0.084 270.4)
-
Step 600
600
#5F70A9
oklch(55.6% 0.091 270.6)
-
Step 700
700 (this color)
#556599
oklch(51.6% 0.085 270.2)
-
Step 800
800
#404D76
oklch(42.8% 0.07 269.9)
-
Step 900
900
#36405F
oklch(37.7% 0.055 269.9)
-
Step 950
950
#202638
oklch(27.1% 0.035 269.8)
#556599 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) | #536A9B | 0.014 |
| Deuteranopia (no green cones) | #4C6498 | 0.013 |
| Tritanopia (no blue cones) | #3D7078 | 0.076 |
| Achromatopsia (no color) | #676767 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556599
#556599
oklch(51.6% 0.085 270.2)
- #7B6527
#7B6527
oklch(51.6% 0.085 89.4)
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 #556599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.027
- French Blue #436BAD ΔE 0.036
- Denim #3B638C ΔE 0.040
- Muted Blue #3B719F ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.046
- Dull Blue #49759C ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.047
- Metallic Blue #4F738E ΔE 0.049
Use #556599 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.