#559FDC
Closest named color: Cornflower Blue (#6495ED). oklch(68.1% 0.117 245.6), rgb(85, 159, 220).
Aa
Black text reads best on this color (7.37:1).
About this color
#559FDC is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.117 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 7.37:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.37:1 |
| White text | 2.84:1 |
Values
| HEX | #559FDC |
| RGB | rgb(85, 159, 220) |
| HSL | hsl(207, 66%, 60%) |
| OKLCH | oklch(68.1% 0.117 245.6) |
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 #559FDC | 2.84:1 | Fails | Lc -59.6 | Large or bold text, headings |
| Black text on #559FDC | 7.37:1 | AAA | Lc 49.7 | Large or bold text, headings |
| #559FDC text on white | 2.84:1 | Fails | Lc 54.3 | Large or bold text, headings |
| #559FDC text on black | 7.37:1 | AAA | Lc -47.5 | 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
#C4DDF3
oklch(88.6% 0.04 244.8)
-
Step 300
300
#9AC6ED
oklch(80.9% 0.072 245.6)
-
Step 400
400 (this color)
#559FDC
oklch(68.1% 0.117 245.6)
-
Step 500
500
#2090DD
oklch(63.2% 0.149 245.3)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#062942
oklch(27.1% 0.061 244.7)
#559FDC 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) | #84A1DF | 0.051 |
| Deuteranopia (no green cones) | #7293DB | 0.040 |
| Tritanopia (no blue cones) | #00AEB4 | 0.092 |
| Achromatopsia (no color) | #999999 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FDC
#559FDC
oklch(68.1% 0.117 245.6)
- #C98842
#C98842
oklch(67.9% 0.117 65.4)
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 #559FDC, 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 0.046
- Dark Sky Blue #448EE4 ΔE 0.055
- Faded Blue #658CBB ΔE 0.062
- Greyblue #77A1B5 ΔE 0.067
- Soft Blue #6488EA ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.077
- Dodger Blue #1E90FF ΔE 0.081
Use #559FDC 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.