#559FD5
Closest named color: Cornflower Blue (#6495ED). oklch(67.7% 0.109 242.4), rgb(85, 159, 213).
Aa
Black text reads best on this color (7.30:1).
About this color
#559FD5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.109 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.052 away. Black text reads best on it, at 7.30:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.30:1 |
| White text | 2.87:1 |
Values
| HEX | #559FD5 |
| RGB | rgb(85, 159, 213) |
| HSL | hsl(205, 60%, 58%) |
| OKLCH | oklch(67.7% 0.109 242.4) |
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 #559FD5 | 2.87:1 | Fails | Lc -60.1 | Content text, not long reading |
| Black text on #559FD5 | 7.30:1 | AAA | Lc 49.3 | Large or bold text, headings |
| #559FD5 text on white | 2.87:1 | Fails | Lc 54.8 | Large or bold text, headings |
| #559FD5 text on black | 7.30:1 | AAA | Lc -47.1 | 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
#C4DDF1
oklch(88.5% 0.038 242.2)
-
Step 300
300
#9AC7EA
oklch(81% 0.069 242.1)
-
Step 400
400 (this color)
#559FD5
oklch(67.7% 0.109 242.4)
-
Step 500
500
#2291D6
oklch(63% 0.14 242.5)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00669D
oklch(49% 0.118 242.7)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950
#062940
oklch(27% 0.058 242.5)
#559FD5 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) | #879FD7 | 0.054 |
| Deuteranopia (no green cones) | #7693D4 | 0.044 |
| Tritanopia (no blue cones) | #00ACB1 | 0.084 |
| Achromatopsia (no color) | #989898 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FD5
#559FD5
oklch(67.7% 0.109 242.4)
- #C7874C
#C7874C
oklch(67.6% 0.109 61.9)
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 #559FD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.054
- Faded Blue #658CBB ΔE 0.057
- Greyblue #77A1B5 ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.070
- Bluegrey #85A3B2 ΔE 0.074
- Silver Lake Blue #778DA9 ΔE 0.074
Use #559FD5 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.