#556DB1
Closest named color: French Blue (#436BAD). oklch(54.7% 0.11 268), rgb(85, 109, 177).
Aa
White text reads best on this color (4.98:1).
About this color
#556DB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.110 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.023 away. White text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.20:1 |
| White text | 4.98:1 |
Values
| HEX | #556DB1 |
| RGB | rgb(85, 109, 177) |
| HSL | hsl(224, 37%, 51%) |
| OKLCH | oklch(54.7% 0.11 268) |
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 #556DB1 | 4.98:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #556DB1 | 4.20:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #556DB1 text on white | 4.98:1 | AA | Lc 74.4 | Content text, not long reading |
| #556DB1 text on black | 4.20:1 | AA large text | Lc -27.3 | 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
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B3C0E2
oklch(80.9% 0.05 268.8)
-
Step 400
400
#8B9FD3
oklch(70.6% 0.08 268.1)
-
Step 500
500
#6F87C7
oklch(63.1% 0.101 267.8)
-
Step 600
600 (this color)
#556DB1
oklch(54.7% 0.11 268)
-
Step 700
700
#485D9B
oklch(49.1% 0.103 268.3)
-
Step 800
800
#3B4C7D
oklch(42.6% 0.084 268.2)
-
Step 900
900
#324065
oklch(37.7% 0.066 267.4)
-
Step 950
950
#1E263B
oklch(27.2% 0.041 267.7)
#556DB1 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) | #5274B4 | 0.019 |
| Deuteranopia (no green cones) | #486CB0 | 0.016 |
| Tritanopia (no blue cones) | #2B7C86 | 0.100 |
| Achromatopsia (no color) | #6F6F6F | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556DB1
#556DB1
oklch(54.7% 0.11 268)
- #8B6C06
#8B6C06
oklch(54.7% 0.11 88.3)
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 #556DB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.035
- Windows Blue #3778BF ΔE 0.041
- Muted Blue #3B719F ΔE 0.044
- Mid Blue #276AB3 ΔE 0.047
- Dull Blue #49759C ΔE 0.047
- Nice Blue #107AB0 ΔE 0.058
- Steel Blue #4682B4 ΔE 0.058
Use #556DB1 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.