#559DCB
Closest named color: Faded Blue (#658CBB). oklch(66.8% 0.1 238.7), rgb(85, 157, 203).
Aa
Black text reads best on this color (7.07:1).
About this color
#559DCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.100 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.047 away. Black text reads best on it, at 7.07:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.07:1 |
| White text | 2.96:1 |
Values
| HEX | #559DCB |
| RGB | rgb(85, 157, 203) |
| HSL | hsl(203, 53%, 56%) |
| OKLCH | oklch(66.8% 0.1 238.7) |
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 #559DCB | 2.96:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #559DCB | 7.07:1 | AAA | Lc 48.0 | Large or bold text, headings |
| #559DCB text on white | 2.96:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #559DCB text on black | 7.07:1 | 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 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A4C6DD
oklch(80.9% 0.049 237.8)
-
Step 400
400
#72A8CC
oklch(70.7% 0.078 238.5)
-
Step 500
500 (this color)
#559DCB
oklch(66.8% 0.1 238.7)
-
Step 600
600
#277BAB
oklch(55.6% 0.108 238.7)
-
Step 700
700
#186793
oklch(49% 0.101 239.2)
-
Step 800
800
#185577
oklch(42.8% 0.082 238.1)
-
Step 900
900
#1B4660
oklch(37.7% 0.065 238.5)
-
Step 950
950
#112938
oklch(26.9% 0.041 238.3)
#559DCB 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) | #889CCD | 0.056 |
| Deuteranopia (no green cones) | #7890CA | 0.048 |
| Tritanopia (no blue cones) | #00A9AC | 0.077 |
| Achromatopsia (no color) | #969696 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DCB
#559DCB
oklch(66.8% 0.1 238.7)
- #C28554
#C28554
oklch(66.8% 0.099 58.7)
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 #559DCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.047
- Greyblue #77A1B5 ΔE 0.050
- Silver Lake Blue #778DA9 ΔE 0.063
- Cornflower Blue #6495ED ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.064
- Dark Sky Blue #448EE4 ΔE 0.065
- Cadet Blue #5F9EA0 ΔE 0.066
- Turquoise Blue #06B1C4 ΔE 0.066
Use #559DCB 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.