#559BD8
Closest named color: Cornflower Blue (#6495ED). oklch(67% 0.115 246.9), rgb(85, 155, 216).
Aa
Black text reads best on this color (7.06:1).
About this color
#559BD8 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.115 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.042 away. Black text reads best on it, at 7.06:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.06:1 |
| White text | 2.97:1 |
Values
| HEX | #559BD8 |
| RGB | rgb(85, 155, 216) |
| HSL | hsl(208, 63%, 59%) |
| OKLCH | oklch(67% 0.115 246.9) |
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 #559BD8 | 2.97:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #559BD8 | 7.06:1 | AAA | Lc 48.0 | Large or bold text, headings |
| #559BD8 text on white | 2.97:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #559BD8 text on black | 7.06:1 | AAA | Lc -45.7 | 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
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9BC6ED
oklch(80.9% 0.072 246.2)
-
Step 400
400 (this color)
#559BD8
oklch(67% 0.115 246.9)
-
Step 500
500
#2A8FDD
oklch(63.1% 0.148 246.9)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0065A5
oklch(49.2% 0.128 246.7)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#044471
oklch(37.6% 0.096 247.1)
-
Step 950
950
#082842
oklch(26.9% 0.061 247.3)
#559BD8 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) | #819DDB | 0.049 |
| Deuteranopia (no green cones) | #6F90D7 | 0.037 |
| Tritanopia (no blue cones) | #00A9B0 | 0.091 |
| Achromatopsia (no color) | #969696 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BD8
#559BD8
oklch(67% 0.115 246.9)
- #C4863F
#C4863F
oklch(66.9% 0.115 67.1)
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 #559BD8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.042
- Chefchaouen Blue #4895EF ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.047
- Faded Blue #658CBB ΔE 0.052
- Soft Blue #6488EA ΔE 0.064
- Greyblue #77A1B5 ΔE 0.068
- Silver Lake Blue #778DA9 ΔE 0.075
- Cool Blue #4984B8 ΔE 0.075
Use #559BD8 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.