#559CDB
Closest named color: Cornflower Blue (#6495ED). oklch(67.3% 0.118 247.3), rgb(85, 156, 219).
Aa
Black text reads best on this color (7.16:1).
About this color
#559CDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.118 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.039 away. Black text reads best on it, at 7.16:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.16:1 |
| White text | 2.93:1 |
Values
| HEX | #559CDB |
| RGB | rgb(85, 156, 219) |
| HSL | hsl(208, 65%, 60%) |
| OKLCH | oklch(67.3% 0.118 247.3) |
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 #559CDB | 2.93:1 | Fails | Lc -60.9 | Content text, not long reading |
| Black text on #559CDB | 7.16:1 | AAA | Lc 48.5 | Large or bold text, headings |
| #559CDB text on white | 2.93:1 | Fails | Lc 55.5 | Large or bold text, headings |
| #559CDB text on black | 7.16:1 | AAA | Lc -46.3 | 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
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF3
oklch(88.4% 0.041 247.1)
-
Step 300
300
#9BC6EE
oklch(81% 0.073 246.9)
-
Step 400
400 (this color)
#559CDB
oklch(67.3% 0.118 247.3)
-
Step 500
500
#278FDF
oklch(63.2% 0.151 247.2)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#024472
oklch(37.6% 0.098 247.2)
-
Step 950
950
#072843
oklch(26.9% 0.063 247.7)
#559CDB 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) | #819EDE | 0.048 |
| Deuteranopia (no green cones) | #6F91DA | 0.037 |
| Tritanopia (no blue cones) | #00ABB2 | 0.094 |
| Achromatopsia (no color) | #979797 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559CDB
#559CDB
oklch(67.3% 0.118 247.3)
- #C6873D
#C6873D
oklch(67.3% 0.118 67.6)
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 #559CDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.039
- Chefchaouen Blue #4895EF ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.048
- Faded Blue #658CBB ΔE 0.056
- Soft Blue #6488EA ΔE 0.063
- Greyblue #77A1B5 ΔE 0.070
- Dodger Blue #1E90FF ΔE 0.077
- Water Blue #0E87CC ΔE 0.079
Use #559CDB 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.