#559FD0
Closest named color: Greyblue (#77A1B5). oklch(67.5% 0.104 239.8), rgb(85, 159, 208).
Aa
Black text reads best on this color (7.25:1).
About this color
#559FD0 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.104 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.053 away. Black text reads best on it, at 7.25:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.25:1 |
| White text | 2.89:1 |
Values
| HEX | #559FD0 |
| RGB | rgb(85, 159, 208) |
| HSL | hsl(204, 57%, 57%) |
| OKLCH | oklch(67.5% 0.104 239.8) |
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 #559FD0 | 2.89:1 | Fails | Lc -60.4 | Content text, not long reading |
| Black text on #559FD0 | 7.25:1 | AAA | Lc 49.0 | Large or bold text, headings |
| #559FD0 text on white | 2.89:1 | Fails | Lc 55.0 | Large or bold text, headings |
| #559FD0 text on black | 7.25:1 | AAA | Lc -46.8 | 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
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C5DDEF
oklch(88.5% 0.036 240.3)
-
Step 300
300
#9BC7E7
oklch(80.9% 0.065 240.2)
-
Step 400
400 (this color)
#559FD0
oklch(67.5% 0.104 239.8)
-
Step 500
500
#2492D1
oklch(63% 0.133 240.2)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557E
oklch(42.8% 0.097 239.2)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#06293E
oklch(26.8% 0.055 240.1)
#559FD0 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) | #899FD2 | 0.057 |
| Deuteranopia (no green cones) | #7892CF | 0.047 |
| Tritanopia (no blue cones) | #00ABB0 | 0.078 |
| Achromatopsia (no color) | #989898 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FD0
#559FD0
oklch(67.5% 0.104 239.8)
- #C68752
#C68752
oklch(67.6% 0.104 59.8)
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 #559FD0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.053
- Faded Blue #658CBB ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.059
- Chefchaouen Blue #4895EF ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.065
- Turquoise Blue #06B1C4 ΔE 0.066
- Bluegrey #85A3B2 ΔE 0.069
- Silver Lake Blue #778DA9 ΔE 0.069
Use #559FD0 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.