#556AC4
Closest named color: Dark Periwinkle (#665FD1). oklch(55.2% 0.141 271.2), rgb(85, 106, 196).
Aa
White text reads best on this color (4.94:1).
About this color
#556AC4 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.141 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.041 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #556AC4 |
| RGB | rgb(85, 106, 196) |
| HSL | hsl(229, 48%, 55%) |
| OKLCH | oklch(55.2% 0.141 271.2) |
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 #556AC4 | 4.94:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #556AC4 | 4.24:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #556AC4 text on white | 4.94:1 | AA | Lc 74.0 | Content text, not long reading |
| #556AC4 text on black | 4.24:1 | AA large text | Lc -27.7 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F1
oklch(88.4% 0.035 271.5)
-
Step 300
300
#B1BFEB
oklch(80.9% 0.064 271.1)
-
Step 400
400
#899DE0
oklch(70.7% 0.101 270.9)
-
Step 500
500
#6D83D8
oklch(63.1% 0.13 271.3)
-
Step 600
600 (this color)
#556AC4
oklch(55.2% 0.141 271.2)
-
Step 700
700
#4659AA
oklch(49.1% 0.131 271)
-
Step 800
800
#3A498A
oklch(42.7% 0.109 271.4)
-
Step 900
900
#313E6E
oklch(37.7% 0.084 270.5)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#556AC4 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) | #4175C7 | 0.033 |
| Deuteranopia (no green cones) | #326CC2 | 0.036 |
| Tritanopia (no blue cones) | #0E7E8D | 0.127 |
| Achromatopsia (no color) | #707070 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556AC4
#556AC4
oklch(55.2% 0.141 271.2)
- #8B6F00
#8B6F00
oklch(55.3% 0.113 91.2)
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 #556AC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.041
- French Blue #436BAD ΔE 0.043
- Iris #6258C4 ΔE 0.046
- Windows Blue #3778BF ΔE 0.047
- Royal Blue #4169E1 ΔE 0.049
- Slate Blue #6A5ACD ΔE 0.050
- Light Indigo #6D5ACF ΔE 0.053
- Mid Blue #276AB3 ΔE 0.054
Use #556AC4 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.