#559EC4
Closest named color: Greyblue (#77A1B5). oklch(66.7% 0.092 233.2), rgb(85, 158, 196).
Aa
Black text reads best on this color (7.07:1).
About this color
#559EC4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.092 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.043 away. Black text reads best on it, at 7.07:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.07:1 |
| White text | 2.96:1 |
Values
| HEX | #559EC4 |
| RGB | rgb(85, 158, 196) |
| HSL | hsl(201, 48%, 55%) |
| OKLCH | oklch(66.7% 0.092 233.2) |
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 #559EC4 | 2.96:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #559EC4 | 7.07:1 | AAA | Lc 48.0 | Large or bold text, headings |
| #559EC4 text on white | 2.96:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #559EC4 text on black | 7.07:1 | AAA | Lc -45.7 | Large or bold text, headings |
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 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A5C6D9
oklch(80.9% 0.044 233.3)
-
Step 400
400
#72A9C7
oklch(70.8% 0.073 233)
-
Step 500
500 (this color)
#559EC4
oklch(66.7% 0.092 233.2)
-
Step 600
600
#277DA4
oklch(55.7% 0.099 232.5)
-
Step 700
700
#17698D
oklch(49.1% 0.093 233.1)
-
Step 800
800
#175672
oklch(42.8% 0.077 232.2)
-
Step 900
900
#1B475C
oklch(37.7% 0.06 232.2)
-
Step 950
950
#112A36
oklch(27.1% 0.038 231.3)
#559EC4 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) | #8C9CC6 | 0.061 |
| Deuteranopia (no green cones) | #7C91C3 | 0.052 |
| Tritanopia (no blue cones) | #00A8AA | 0.068 |
| Achromatopsia (no color) | #969696 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559EC4
#559EC4
oklch(66.7% 0.092 233.2)
- #C1845D
#C1845D
oklch(66.6% 0.093 53.1)
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 #559EC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.043
- Faded Blue #658CBB ΔE 0.049
- Cadet Blue #5F9EA0 ΔE 0.055
- Silver Lake Blue #778DA9 ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.060
- Bluegrey #85A3B2 ΔE 0.061
- Blue Grey #758DA3 ΔE 0.062
- Bluey Grey #89A0B0 ΔE 0.063
Use #559EC4 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.