#556FE4
Closest named color: Royal Blue (#4169E1). oklch(58.4% 0.179 270.5), rgb(85, 111, 228).
Aa
Black text reads best on this color (4.78:1).
About this color
#556FE4 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.179 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.029 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.78:1 |
| White text | 4.39:1 |
Values
| HEX | #556FE4 |
| RGB | rgb(85, 111, 228) |
| HSL | hsl(229, 73%, 61%) |
| OKLCH | oklch(58.4% 0.179 270.5) |
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 #556FE4 | 4.39:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #556FE4 | 4.78:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #556FE4 text on white | 4.39:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #556FE4 text on black | 4.78:1 | AA | Lc -31.5 | 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
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBFF6
oklch(81% 0.081 270.5)
-
Step 400
400
#829BF1
oklch(70.6% 0.129 270.5)
-
Step 500
500
#6580EC
oklch(63.2% 0.164 270.5)
-
Step 600
600 (this color)
#556FE4
oklch(58.4% 0.179 270.5)
-
Step 700
700
#3F54BE
oklch(49.1% 0.168 270.6)
-
Step 800
800
#344699
oklch(42.8% 0.137 270.4)
-
Step 900
900
#2D3B7A
oklch(37.6% 0.108 271)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#556FE4 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) | #297FE8 | 0.049 |
| Deuteranopia (no green cones) | #0072E2 | 0.053 |
| Tritanopia (no blue cones) | #008A9F | 0.151 |
| Achromatopsia (no color) | #787878 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556FE4
#556FE4
oklch(58.4% 0.179 270.5)
- #967700
#967700
oklch(58.3% 0.119 90.5)
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 #556FE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.029
- Neon Blue #4361EE ΔE 0.045
- Cornflower #6A79F7 ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.048
- Clear Blue #247AFD ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.055
- Medium Slate Blue #7B68EE ΔE 0.055
- Warm Blue #4B57DB ΔE 0.061
Use #556FE4 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.