#559DD3
Closest named color: Faded Blue (#658CBB). oklch(67.2% 0.108 243), rgb(85, 157, 211).
Aa
Black text reads best on this color (7.14:1).
About this color
#559DD3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.108 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.051 away. Black text reads best on it, at 7.14:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.14:1 |
| White text | 2.93:1 |
Values
| HEX | #559DD3 |
| RGB | rgb(85, 157, 211) |
| HSL | hsl(206, 59%, 58%) |
| OKLCH | oklch(67.2% 0.108 243) |
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 #559DD3 | 2.93:1 | Fails | Lc -61.0 | Content text, not long reading |
| Black text on #559DD3 | 7.14:1 | AAA | Lc 48.4 | Large or bold text, headings |
| #559DD3 text on white | 2.93:1 | Fails | Lc 55.6 | Large or bold text, headings |
| #559DD3 text on black | 7.14:1 | AAA | Lc -46.2 | 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 400.
-
Step 50
50
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDF1
oklch(88.6% 0.038 243.3)
-
Step 300
300
#9BC6E9
oklch(80.8% 0.067 243.3)
-
Step 400
400 (this color)
#559DD3
oklch(67.2% 0.108 243)
-
Step 500
500
#2791D6
oklch(63.1% 0.139 243.1)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#02466D
oklch(37.8% 0.089 242.5)
-
Step 950
950
#072940
oklch(27% 0.057 243.1)
#559DD3 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) | #859ED5 | 0.053 |
| Deuteranopia (no green cones) | #7491D2 | 0.042 |
| Tritanopia (no blue cones) | #00AAB0 | 0.083 |
| Achromatopsia (no color) | #979797 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DD3
#559DD3
oklch(67.2% 0.108 243)
- #C5864A
#C5864A
oklch(67.2% 0.109 62.7)
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 #559DD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.057
- Greyblue #77A1B5 ΔE 0.059
- Silver Lake Blue #778DA9 ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.073
- Soft Blue #6488EA ΔE 0.074
Use #559DD3 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.