#559DE3
Closest named color: Cornflower Blue (#6495ED). oklch(68% 0.127 249.6), rgb(85, 157, 227).
Aa
Black text reads best on this color (7.31:1).
About this color
#559DE3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.127 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.031 away. Black text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.31:1 |
| White text | 2.86:1 |
Values
| HEX | #559DE3 |
| RGB | rgb(85, 157, 227) |
| HSL | hsl(210, 72%, 61%) |
| OKLCH | oklch(68% 0.127 249.6) |
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 #559DE3 | 2.86:1 | Fails | Lc -60.0 | Large or bold text, headings |
| Black text on #559DE3 | 7.31:1 | AAA | Lc 49.4 | Large or bold text, headings |
| #559DE3 text on white | 2.86:1 | Fails | Lc 54.7 | Large or bold text, headings |
| #559DE3 text on black | 7.31:1 | AAA | Lc -47.2 | 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
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF6
oklch(88.5% 0.044 250.4)
-
Step 300
300
#99C5F2
oklch(80.8% 0.079 249.4)
-
Step 400
400 (this color)
#559DE3
oklch(68% 0.127 249.6)
-
Step 500
500
#238DE6
oklch(63.1% 0.162 249.5)
-
Step 600
600
#0076C9
oklch(55.6% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950
#062845
oklch(27% 0.066 248.8)
#559DE3 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) | #7FA0E6 | 0.046 |
| Deuteranopia (no green cones) | #6B92E2 | 0.034 |
| Tritanopia (no blue cones) | #00ADB6 | 0.100 |
| Achromatopsia (no color) | #989898 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DE3
#559DE3
oklch(68% 0.127 249.6)
- #CA8832
#CA8832
oklch(67.9% 0.127 69.2)
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 #559DE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.031
- Chefchaouen Blue #4895EF ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.046
- Soft Blue #6488EA ΔE 0.059
- Faded Blue #658CBB ΔE 0.066
- Dodger Blue #1E90FF ΔE 0.070
- Perrywinkle #8F8CE7 ΔE 0.076
- Periwinkle Blue #8F99FB ΔE 0.077
Use #559DE3 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.