#559DD9
Closest named color: Cornflower Blue (#6495ED). oklch(67.5% 0.115 245.8), rgb(85, 157, 217).
Aa
Black text reads best on this color (7.21:1).
About this color
#559DD9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.115 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.043 away. Black text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.21:1 |
| White text | 2.91:1 |
Values
| HEX | #559DD9 |
| RGB | rgb(85, 157, 217) |
| HSL | hsl(207, 63%, 59%) |
| OKLCH | oklch(67.5% 0.115 245.8) |
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 #559DD9 | 2.91:1 | Fails | Lc -60.6 | Content text, not long reading |
| Black text on #559DD9 | 7.21:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #559DD9 text on white | 2.91:1 | Fails | Lc 55.3 | Large or bold text, headings |
| #559DD9 text on black | 7.21:1 | AAA | Lc -46.5 | 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 400.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C4DCF3
oklch(88.4% 0.041 247.1)
-
Step 300
300
#9AC6ED
oklch(80.9% 0.072 245.6)
-
Step 400
400 (this color)
#559DD9
oklch(67.5% 0.115 245.8)
-
Step 500
500
#2690DC
oklch(63.2% 0.147 245.6)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#014571
oklch(37.8% 0.096 245.7)
-
Step 950
950
#072942
oklch(27.1% 0.06 245.2)
#559DD9 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) | #839FDC | 0.051 |
| Deuteranopia (no green cones) | #7191D8 | 0.040 |
| Tritanopia (no blue cones) | #00ABB2 | 0.089 |
| Achromatopsia (no color) | #979797 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DD9
#559DD9
oklch(67.5% 0.115 245.8)
- #C68742
#C68742
oklch(67.4% 0.115 66)
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 #559DD9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.043
- Chefchaouen Blue #4895EF ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.052
- Faded Blue #658CBB ΔE 0.056
- Greyblue #77A1B5 ΔE 0.066
- Soft Blue #6488EA ΔE 0.068
- Silver Lake Blue #778DA9 ΔE 0.077
- Turquoise Blue #06B1C4 ΔE 0.078
Use #559DD9 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.