#556DC3
Closest named color: Windows Blue (#3778BF). oklch(55.8% 0.136 269.8), rgb(85, 109, 195).
Aa
White text reads best on this color (4.81:1).
About this color
#556DC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.136 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.041 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #556DC3 |
| RGB | rgb(85, 109, 195) |
| HSL | hsl(227, 48%, 55%) |
| OKLCH | oklch(55.8% 0.136 269.8) |
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 #556DC3 | 4.81:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #556DC3 | 4.36:1 | AA large text | Lc 30.9 | Non-text elements, placeholder text |
| #556DC3 text on white | 4.81:1 | AA | Lc 73.2 | Content text, not long reading |
| #556DC3 text on black | 4.36:1 | AA large text | Lc -28.5 | 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 600.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1BFE9
oklch(80.8% 0.061 270.5)
-
Step 400
400
#889EDE
oklch(70.7% 0.097 269.3)
-
Step 500
500
#6C84D5
oklch(63.1% 0.125 270)
-
Step 600
600 (this color)
#556DC3
oklch(55.8% 0.136 269.8)
-
Step 700
700
#455AA8
oklch(49.1% 0.127 269.9)
-
Step 800
800
#394A88
oklch(42.7% 0.105 270)
-
Step 900
900
#313E6D
oklch(37.7% 0.082 270.4)
-
Step 950
950
#1C2540
oklch(27.1% 0.052 268.8)
#556DC3 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) | #4777C6 | 0.028 |
| Deuteranopia (no green cones) | #396DC1 | 0.030 |
| Tritanopia (no blue cones) | #0F808E | 0.122 |
| Achromatopsia (no color) | #727272 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556DC3
#556DC3
oklch(55.8% 0.136 269.8)
- #8E7000
#8E7000
oklch(55.9% 0.114 90)
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 #556DC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.041
- French Blue #436BAD ΔE 0.042
- Dark Periwinkle #665FD1 ΔE 0.047
- Royal Blue #4169E1 ΔE 0.053
- Mid Blue #276AB3 ΔE 0.054
- Iris #6258C4 ΔE 0.054
- Flat Blue #3C73A8 ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.056
Use #556DC3 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.