#556FAC
Closest named color: French Blue (#436BAD). oklch(54.9% 0.1 265.7), rgb(85, 111, 172).
Aa
White text reads best on this color (4.93:1).
About this color
#556FAC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.100 and its hue 266°. 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 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.25:1 |
| White text | 4.93:1 |
Values
| HEX | #556FAC |
| RGB | rgb(85, 111, 172) |
| HSL | hsl(222, 34%, 50%) |
| OKLCH | oklch(54.9% 0.1 265.7) |
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 #556FAC | 4.93:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #556FAC | 4.25:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #556FAC text on white | 4.93:1 | AA | Lc 74.1 | Content text, not long reading |
| #556FAC text on black | 4.25:1 | AA large text | Lc -27.6 | 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
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B3C1DF
oklch(81% 0.045 265.5)
-
Step 400
400
#8BA0CF
oklch(70.7% 0.073 265.9)
-
Step 500
500
#6F88C2
oklch(63.1% 0.093 266)
-
Step 600
600 (this color)
#556FAC
oklch(54.9% 0.1 265.7)
-
Step 700
700
#475F96
oklch(49.2% 0.093 265.3)
-
Step 800
800
#3B4D7A
oklch(42.7% 0.078 266.6)
-
Step 900
900
#324162
oklch(37.8% 0.06 265)
-
Step 950
950
#1D2639
oklch(27% 0.038 264.5)
#556FAC 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) | #5875AF | 0.018 |
| Deuteranopia (no green cones) | #4E6DAB | 0.011 |
| Tritanopia (no blue cones) | #2F7C85 | 0.090 |
| Achromatopsia (no color) | #707070 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556FAC
#556FAC
oklch(54.9% 0.1 265.7)
- #8B6C1E
#8B6C1E
oklch(54.8% 0.1 85.8)
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 #556FAC, 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 0.029
- Dull Blue #49759C ΔE 0.037
- Muted Blue #3B719F ΔE 0.037
- Windows Blue #3778BF ΔE 0.041
- Stormy Blue #507B9C ΔE 0.048
- Cerulean #457B9D ΔE 0.049
- Mid Blue #276AB3 ΔE 0.050
Use #556FAC 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.