#559FE4
Closest named color: Cornflower Blue (#6495ED). oklch(68.5% 0.126 248.7), rgb(85, 159, 228).
Aa
Black text reads best on this color (7.46:1).
About this color
#559FE4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.126 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.035 away. Black text reads best on it, at 7.46:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.46:1 |
| White text | 2.81:1 |
Values
| HEX | #559FE4 |
| RGB | rgb(85, 159, 228) |
| HSL | hsl(209, 73%, 61%) |
| OKLCH | oklch(68.5% 0.126 248.7) |
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 #559FE4 | 2.81:1 | Fails | Lc -59.1 | Large or bold text, headings |
| Black text on #559FE4 | 7.46:1 | AAA | Lc 50.2 | Large or bold text, headings |
| #559FE4 text on white | 2.81:1 | Fails | Lc 53.8 | Large or bold text, headings |
| #559FE4 text on black | 7.46:1 | AAA | Lc -48.0 | 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 400.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF9
oklch(93.7% 0.022 248.1)
-
Step 200
200
#C3DCF6
oklch(88.4% 0.045 249.4)
-
Step 300
300
#99C6F2
oklch(81% 0.079 248.3)
-
Step 400
400 (this color)
#559FE4
oklch(68.5% 0.126 248.7)
-
Step 500
500
#1E8EE6
oklch(63.2% 0.162 248.6)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#004475
oklch(37.8% 0.103 248.3)
-
Step 950
950
#052845
oklch(27% 0.066 248.3)
#559FE4 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) | #81A2E7 | 0.048 |
| Deuteranopia (no green cones) | #6E94E3 | 0.035 |
| Tritanopia (no blue cones) | #00AFB7 | 0.099 |
| Achromatopsia (no color) | #9A9A9A | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FE4
#559FE4
oklch(68.5% 0.126 248.7)
- #CC8A36
#CC8A36
oklch(68.5% 0.126 68.9)
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 #559FE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.035
- Chefchaouen Blue #4895EF ΔE 0.037
- Dark Sky Blue #448EE4 ΔE 0.051
- Soft Blue #6488EA ΔE 0.064
- Faded Blue #658CBB ΔE 0.070
- Dodger Blue #1E90FF ΔE 0.073
- Periwinkle Blue #8F99FB ΔE 0.076
- Greyblue #77A1B5 ΔE 0.078
Use #559FE4 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.