#559FD4
Closest named color: Cornflower Blue (#6495ED). oklch(67.7% 0.108 241.9), rgb(85, 159, 212).
Aa
Black text reads best on this color (7.29:1).
About this color
#559FD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.108 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.053 away. Black text reads best on it, at 7.29:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.29:1 |
| White text | 2.87:1 |
Values
| HEX | #559FD4 |
| RGB | rgb(85, 159, 212) |
| HSL | hsl(205, 60%, 58%) |
| OKLCH | oklch(67.7% 0.108 241.9) |
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 #559FD4 | 2.87:1 | Fails | Lc -60.1 | Content text, not long reading |
| Black text on #559FD4 | 7.29:1 | AAA | Lc 49.2 | Large or bold text, headings |
| #559FD4 text on white | 2.87:1 | Fails | Lc 54.8 | Large or bold text, headings |
| #559FD4 text on black | 7.29:1 | AAA | Lc -47.0 | 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
#C4DDF0
oklch(88.5% 0.037 240.7)
-
Step 300
300
#9AC7E9
oklch(80.9% 0.068 241.3)
-
Step 400
400 (this color)
#559FD4
oklch(67.7% 0.108 241.9)
-
Step 500
500
#2392D5
oklch(63.2% 0.138 241.7)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#062940
oklch(27% 0.058 242.5)
#559FD4 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) | #879FD6 | 0.054 |
| Deuteranopia (no green cones) | #7693D3 | 0.044 |
| Tritanopia (no blue cones) | #00ACB1 | 0.083 |
| Achromatopsia (no color) | #989898 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FD4
#559FD4
oklch(67.7% 0.108 241.9)
- #C7874D
#C7874D
oklch(67.6% 0.108 61.5)
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 #559FD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.055
- Faded Blue #658CBB ΔE 0.056
- Greyblue #77A1B5 ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.069
- Bluegrey #85A3B2 ΔE 0.073
- Silver Lake Blue #778DA9 ΔE 0.073
Use #559FD4 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.