#559FC2
Closest named color: Greyblue (#77A1B5). oklch(66.9% 0.09 230.7), rgb(85, 159, 194).
Aa
Black text reads best on this color (7.12:1).
About this color
#559FC2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.090 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.040 away. Black text reads best on it, at 7.12:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.12:1 |
| White text | 2.94:1 |
Values
| HEX | #559FC2 |
| RGB | rgb(85, 159, 194) |
| HSL | hsl(199, 47%, 55%) |
| OKLCH | oklch(66.9% 0.09 230.7) |
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 #559FC2 | 2.94:1 | Fails | Lc -61.1 | Content text, not long reading |
| Black text on #559FC2 | 7.12:1 | AAA | Lc 48.2 | Large or bold text, headings |
| #559FC2 text on white | 2.94:1 | Fails | Lc 55.8 | Large or bold text, headings |
| #559FC2 text on black | 7.12:1 | AAA | Lc -46.0 | 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
#CADDE7
oklch(88.6% 0.025 230.5)
-
Step 300
300
#A5C6D8
oklch(80.8% 0.044 231.9)
-
Step 400
400
#72A9C5
oklch(70.7% 0.071 231.2)
-
Step 500
500 (this color)
#559FC2
oklch(66.9% 0.09 230.7)
-
Step 600
600
#267DA2
oklch(55.6% 0.098 231)
-
Step 700
700
#16698B
oklch(49% 0.092 231.4)
-
Step 800
800
#175671
oklch(42.7% 0.076 231.3)
-
Step 900
900
#1B475B
oklch(37.7% 0.059 230.9)
-
Step 950
950
#112A35
oklch(27.1% 0.037 229)
#559FC2 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) | #8D9DC4 | 0.062 |
| Deuteranopia (no green cones) | #7E91C2 | 0.055 |
| Tritanopia (no blue cones) | #00A9AA | 0.065 |
| Achromatopsia (no color) | #969696 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FC2
#559FC2
oklch(66.9% 0.09 230.7)
- #C28461
#C28461
oklch(66.8% 0.091 50.1)
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 #559FC2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.040
- Cadet Blue #5F9EA0 ΔE 0.051
- Faded Blue #658CBB ΔE 0.052
- Turquoise Blue #06B1C4 ΔE 0.056
- Bluegrey #85A3B2 ΔE 0.058
- Silver Lake Blue #778DA9 ΔE 0.059
- Bluey Grey #89A0B0 ΔE 0.061
- Blue Grey #758DA3 ΔE 0.062
Use #559FC2 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.