#556DBF
Closest named color: French Blue (#436BAD). oklch(55.5% 0.13 269.5), rgb(85, 109, 191).
Aa
White text reads best on this color (4.85:1).
About this color
#556DBF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.130 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.037 away. White text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.32:1 |
| White text | 4.85:1 |
Values
| HEX | #556DBF |
| RGB | rgb(85, 109, 191) |
| HSL | hsl(226, 45%, 54%) |
| OKLCH | oklch(55.5% 0.13 269.5) |
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 #556DBF | 4.85:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #556DBF | 4.32:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #556DBF text on white | 4.85:1 | AA | Lc 73.5 | Content text, not long reading |
| #556DBF text on black | 4.32:1 | AA large text | Lc -28.2 | 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
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B1C0E7
oklch(80.9% 0.058 268.6)
-
Step 400
400
#899EDC
oklch(70.7% 0.094 269.5)
-
Step 500
500
#6D85D2
oklch(63.2% 0.12 269.6)
-
Step 600
600 (this color)
#556DBF
oklch(55.5% 0.13 269.5)
-
Step 700
700
#465BA5
oklch(49.2% 0.121 269.6)
-
Step 800
800
#394B86
oklch(42.8% 0.1 269.1)
-
Step 900
900
#313F6B
oklch(37.8% 0.078 269.1)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#556DBF 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) | #4A76C2 | 0.025 |
| Deuteranopia (no green cones) | #3D6DBD | 0.027 |
| Tritanopia (no blue cones) | #187F8D | 0.116 |
| Achromatopsia (no color) | #717171 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556DBF
#556DBF
oklch(55.5% 0.13 269.5)
- #8D6F00
#8D6F00
oklch(55.5% 0.113 89.9)
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 #556DBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.037
- Windows Blue #3778BF ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.051
- Mid Blue #276AB3 ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.052
- Iris #6258C4 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.059
- Slate Blue #6A5ACD ΔE 0.060
Use #556DBF 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.