#556FDC
Closest named color: Royal Blue (#4169E1). oklch(57.8% 0.168 270.3), rgb(85, 111, 220).
Aa
Black text reads best on this color (4.69:1).
About this color
#556FDC is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.168 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.030 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #556FDC |
| RGB | rgb(85, 111, 220) |
| HSL | hsl(228, 66%, 60%) |
| OKLCH | oklch(57.8% 0.168 270.3) |
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 #556FDC | 4.47:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #556FDC | 4.69:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #556FDC text on white | 4.47:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #556FDC text on black | 4.69:1 | AA | Lc -30.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED8F6
oklch(88.4% 0.043 270.9)
-
Step 300
300
#AEBFF2
oklch(80.9% 0.075 270.3)
-
Step 400
400
#849CEC
oklch(70.7% 0.121 270.4)
-
Step 500
500
#6681E6
oklch(63.1% 0.155 270.2)
-
Step 600
600 (this color)
#556FDC
oklch(57.8% 0.168 270.3)
-
Step 700
700
#4056B8
oklch(49.1% 0.156 270.2)
-
Step 800
800
#354795
oklch(42.8% 0.129 270.3)
-
Step 900
900
#2E3C77
oklch(37.7% 0.102 270.8)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#556FDC 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) | #347DE0 | 0.042 |
| Deuteranopia (no green cones) | #1471DA | 0.049 |
| Tritanopia (no blue cones) | #00889B | 0.144 |
| Achromatopsia (no color) | #777777 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556FDC
#556FDC
oklch(57.8% 0.168 270.3)
- #957600
#957600
oklch(57.9% 0.118 90.3)
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 #556FDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.030
- Dark Periwinkle #665FD1 ΔE 0.044
- Neon Blue #4361EE ΔE 0.051
- Cornflower #6A79F7 ΔE 0.055
- Slate Blue #6A5ACD ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.059
- Medium Slate Blue #7B68EE ΔE 0.060
Use #556FDC 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.