#556FD5
Closest named color: Royal Blue (#4169E1). oklch(57.4% 0.159 270), rgb(85, 111, 213).
Aa
Black text reads best on this color (4.62:1).
About this color
#556FD5 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.159 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.034 away. Black text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.62:1 |
| White text | 4.54:1 |
Values
| HEX | #556FD5 |
| RGB | rgb(85, 111, 213) |
| HSL | hsl(228, 60%, 58%) |
| OKLCH | oklch(57.4% 0.159 270) |
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 #556FD5 | 4.54:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #556FD5 | 4.62:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #556FD5 text on white | 4.54:1 | AA | Lc 71.3 | Content text, not long reading |
| #556FD5 text on black | 4.62:1 | AA | Lc -30.4 | Non-text elements, placeholder text |
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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CFD9F4
oklch(88.6% 0.039 269.4)
-
Step 300
300
#AEBFF0
oklch(80.9% 0.072 269.8)
-
Step 400
400
#859DE8
oklch(70.8% 0.114 269.8)
-
Step 500
500
#6882E1
oklch(63.1% 0.146 270.3)
-
Step 600
600 (this color)
#556FD5
oklch(57.4% 0.159 270)
-
Step 700
700
#4157B3
oklch(49% 0.148 270)
-
Step 800
800
#364891
oklch(42.7% 0.122 270.1)
-
Step 900
900
#2E3D74
oklch(37.7% 0.096 269.9)
-
Step 950
950
#1B2444
oklch(27% 0.061 270.1)
#556FD5 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) | #3C7CD9 | 0.038 |
| Deuteranopia (no green cones) | #2571D3 | 0.042 |
| Tritanopia (no blue cones) | #008698 | 0.137 |
| Achromatopsia (no color) | #767676 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556FD5
#556FD5
oklch(57.4% 0.159 270)
- #937400
#937400
oklch(57.3% 0.117 90)
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 #556FD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Dark Periwinkle #665FD1 ΔE 0.042
- Windows Blue #3778BF ΔE 0.053
- Slate Blue #6A5ACD ΔE 0.055
- Light Indigo #6D5ACF ΔE 0.057
- Neon Blue #4361EE ΔE 0.058
- Iris #6258C4 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.063
Use #556FD5 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.