#556DB4
Closest named color: French Blue (#436BAD). oklch(54.9% 0.115 268.4), rgb(85, 109, 180).
Aa
White text reads best on this color (4.96:1).
About this color
#556DB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.115 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.025 away. White text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.23:1 |
| White text | 4.96:1 |
Values
| HEX | #556DB4 |
| RGB | rgb(85, 109, 180) |
| HSL | hsl(225, 39%, 52%) |
| OKLCH | oklch(54.9% 0.115 268.4) |
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 #556DB4 | 4.96:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #556DB4 | 4.23:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #556DB4 text on white | 4.96:1 | AA | Lc 74.2 | Content text, not long reading |
| #556DB4 text on black | 4.23:1 | AA large text | Lc -27.5 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E3
oklch(80.9% 0.052 268)
-
Step 400
400
#8B9FD5
oklch(70.7% 0.083 268.6)
-
Step 500
500
#6E86CA
oklch(63% 0.107 268.5)
-
Step 600
600 (this color)
#556DB4
oklch(54.9% 0.115 268.4)
-
Step 700
700
#475D9D
oklch(49.2% 0.106 268)
-
Step 800
800
#3B4C7F
oklch(42.7% 0.088 268.6)
-
Step 900
900
#324066
oklch(37.8% 0.068 267.7)
-
Step 950
950
#1D253C
oklch(26.9% 0.045 268.7)
#556DB4 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) | #5174B7 | 0.019 |
| Deuteranopia (no green cones) | #466CB2 | 0.019 |
| Tritanopia (no blue cones) | #277C88 | 0.102 |
| Achromatopsia (no color) | #707070 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556DB4
#556DB4
oklch(54.9% 0.115 268.4)
- #8C6C00
#8C6C00
oklch(54.8% 0.112 88.1)
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 #556DB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.038
- Windows Blue #3778BF ΔE 0.039
- Mid Blue #276AB3 ΔE 0.047
- Muted Blue #3B719F ΔE 0.048
- Dull Blue #49759C ΔE 0.051
- Steel Blue #4682B4 ΔE 0.059
- Nice Blue #107AB0 ΔE 0.060
Use #556DB4 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.