#556FB3
Closest named color: French Blue (#436BAD). oklch(55.3% 0.111 267), rgb(85, 111, 179).
Aa
White text reads best on this color (4.87:1).
About this color
#556FB3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.111 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.027 away. White text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.31:1 |
| White text | 4.87:1 |
Values
| HEX | #556FB3 |
| RGB | rgb(85, 111, 179) |
| HSL | hsl(223, 38%, 52%) |
| OKLCH | oklch(55.3% 0.111 267) |
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 #556FB3 | 4.87:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #556FB3 | 4.31:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #556FB3 text on white | 4.87:1 | AA | Lc 73.6 | Content text, not long reading |
| #556FB3 text on black | 4.31:1 | AA large text | Lc -28.1 | 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
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B2C0E2
oklch(80.8% 0.051 267.6)
-
Step 400
400
#8AA0D3
oklch(70.8% 0.079 266.3)
-
Step 500
500
#6E87C7
oklch(63.1% 0.101 267.2)
-
Step 600
600 (this color)
#556FB3
oklch(55.3% 0.111 267)
-
Step 700
700
#465D9B
oklch(49% 0.104 267.2)
-
Step 800
800
#3A4D7E
oklch(42.8% 0.085 266.8)
-
Step 900
900
#324065
oklch(37.7% 0.066 267.4)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#556FB3 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) | #5476B6 | 0.019 |
| Deuteranopia (no green cones) | #496DB2 | 0.016 |
| Tritanopia (no blue cones) | #287E88 | 0.100 |
| Achromatopsia (no color) | #717171 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556FB3
#556FB3
oklch(55.3% 0.111 267)
- #8E6D08
#8E6D08
oklch(55.2% 0.111 87.1)
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 #556FB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.035
- Windows Blue #3778BF ΔE 0.037
- Muted Blue #3B719F ΔE 0.045
- Dull Blue #49759C ΔE 0.046
- Mid Blue #276AB3 ΔE 0.049
- Steel Blue #4682B4 ΔE 0.054
- Nice Blue #107AB0 ΔE 0.056
Use #556FB3 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.