#559DD5
Closest named color: Cornflower Blue (#6495ED). oklch(67.3% 0.11 244), rgb(85, 157, 213).
Aa
Black text reads best on this color (7.16:1).
About this color
#559DD5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.110 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.049 away. Black text reads best on it, at 7.16:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.16:1 |
| White text | 2.92:1 |
Values
| HEX | #559DD5 |
| RGB | rgb(85, 157, 213) |
| HSL | hsl(206, 60%, 58%) |
| OKLCH | oklch(67.3% 0.11 244) |
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 #559DD5 | 2.92:1 | Fails | Lc -60.8 | Content text, not long reading |
| Black text on #559DD5 | 7.16:1 | AAA | Lc 48.5 | Large or bold text, headings |
| #559DD5 text on white | 2.92:1 | Fails | Lc 55.5 | Large or bold text, headings |
| #559DD5 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DDF1
oklch(88.6% 0.038 243.3)
-
Step 300
300
#9BC6EB
oklch(80.9% 0.07 244.8)
-
Step 400
400 (this color)
#559DD5
oklch(67.3% 0.11 244)
-
Step 500
500
#2791D8
oklch(63.2% 0.141 243.8)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#01456E
oklch(37.6% 0.092 243.9)
-
Step 950
950
#072941
oklch(27.1% 0.059 244.2)
#559DD5 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) | #849ED8 | 0.051 |
| Deuteranopia (no green cones) | #7391D4 | 0.042 |
| Tritanopia (no blue cones) | #00ABB0 | 0.087 |
| Achromatopsia (no color) | #979797 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DD5
#559DD5
oklch(67.3% 0.11 244)
- #C58748
#C58748
oklch(67.3% 0.11 64.4)
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 #559DD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.049
- Chefchaouen Blue #4895EF ΔE 0.050
- Faded Blue #658CBB ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.055
- Greyblue #77A1B5 ΔE 0.061
- Soft Blue #6488EA ΔE 0.072
- Silver Lake Blue #778DA9 ΔE 0.073
- Turquoise Blue #06B1C4 ΔE 0.074
Use #559DD5 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.