#559BD0
Closest named color: Faded Blue (#658CBB). oklch(66.6% 0.106 243.2), rgb(85, 155, 208).
Aa
Black text reads best on this color (6.98:1).
About this color
#559BD0 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.106 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.045 away. Black text reads best on it, at 6.98:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.98:1 |
| White text | 3.00:1 |
Values
| HEX | #559BD0 |
| RGB | rgb(85, 155, 208) |
| HSL | hsl(206, 57%, 57%) |
| OKLCH | oklch(66.6% 0.106 243.2) |
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 #559BD0 | 3.00:1 | AA large text | Lc -61.9 | Content text, not long reading |
| Black text on #559BD0 | 6.98:1 | AA | Lc 47.5 | Large or bold text, headings |
| #559BD0 text on white | 3.00:1 | AA large text | Lc 56.6 | Large or bold text, headings |
| #559BD0 text on black | 6.98:1 | AA | Lc -45.2 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A4C5E0
oklch(80.8% 0.052 243.1)
-
Step 400
400
#72A7D1
oklch(70.7% 0.083 243.2)
-
Step 500
500 (this color)
#559BD0
oklch(66.6% 0.106 243.2)
-
Step 600
600
#287AB1
oklch(55.7% 0.115 242.7)
-
Step 700
700
#1A6698
oklch(49.1% 0.107 243.2)
-
Step 800
800
#19537C
oklch(42.6% 0.09 244)
-
Step 900
900
#1C4563
oklch(37.6% 0.069 243.3)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#559BD0 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) | #849CD2 | 0.052 |
| Deuteranopia (no green cones) | #738FCF | 0.042 |
| Tritanopia (no blue cones) | #00A8AD | 0.084 |
| Achromatopsia (no color) | #959595 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BD0
#559BD0
oklch(66.6% 0.106 243.2)
- #C2854A
#C2854A
oklch(66.6% 0.106 63.3)
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 #559BD0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.045
- Cornflower Blue #6495ED ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.055
- Greyblue #77A1B5 ΔE 0.059
- Silver Lake Blue #778DA9 ΔE 0.066
- Dusty Blue #5A86AD ΔE 0.069
- Cool Blue #4984B8 ΔE 0.070
Use #559BD0 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.