#556DEE
Closest named color: Royal Blue (#4169E1). oklch(58.7% 0.195 271.2), rgb(85, 109, 238).
Aa
Black text reads best on this color (4.80:1).
About this color
#556DEE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.195 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.032 away. Black text reads best on it, at 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.195) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.80:1 |
| White text | 4.36:1 |
Values
| HEX | #556DEE |
| RGB | rgb(85, 109, 238) |
| HSL | hsl(231, 82%, 63%) |
| OKLCH | oklch(58.7% 0.195 271.2) |
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 #556DEE | 4.36:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #556DEE | 4.80:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #556DEE text on white | 4.36:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #556DEE text on black | 4.80:1 | AA | Lc -31.8 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ACBEFA
oklch(80.9% 0.087 271.4)
-
Step 400
400
#819AF8
oklch(70.7% 0.141 271.2)
-
Step 500
500
#637DF4
oklch(63% 0.179 271.1)
-
Step 600
600 (this color)
#556DEE
oklch(58.7% 0.195 271.2)
-
Step 700
700
#3F51C5
oklch(49.1% 0.181 271.4)
-
Step 800
800
#3343A0
oklch(42.7% 0.151 271.1)
-
Step 900
900
#2C3A7F
oklch(37.7% 0.117 271.1)
-
Step 950
950
#1A234A
oklch(27.1% 0.073 271.1)
#556DEE 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) | #0080F2 | 0.060 |
| Deuteranopia (no green cones) | #0072EB | 0.052 |
| Tritanopia (no blue cones) | #008CA3 | 0.163 |
| Achromatopsia (no color) | #797979 | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556DEE
#556DEE
oklch(58.7% 0.195 271.2)
- #977900
#977900
oklch(58.8% 0.12 91.4)
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 #556DEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.032
- Neon Blue #4361EE ΔE 0.038
- Cornflower #6A79F7 ΔE 0.044
- Clear Blue #247AFD ΔE 0.048
- Medium Slate Blue #7B68EE ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.055
- Warm Blue #4B57DB ΔE 0.061
Use #556DEE 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.