#559CE5
Closest named color: Cornflower Blue (#6495ED). oklch(67.8% 0.13 250.9), rgb(85, 156, 229).
Aa
Black text reads best on this color (7.27:1).
About this color
#559CE5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.130 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.027 away. Black text reads best on it, at 7.27:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.27:1 |
| White text | 2.88:1 |
Values
| HEX | #559CE5 |
| RGB | rgb(85, 156, 229) |
| HSL | hsl(210, 73%, 62%) |
| OKLCH | oklch(67.8% 0.13 250.9) |
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 #559CE5 | 2.88:1 | Fails | Lc -60.2 | Content text, not long reading |
| Black text on #559CE5 | 7.27:1 | AAA | Lc 49.1 | Large or bold text, headings |
| #559CE5 text on white | 2.88:1 | Fails | Lc 54.9 | Large or bold text, headings |
| #559CE5 text on black | 7.27:1 | AAA | Lc -46.9 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF7
oklch(88.5% 0.045 251.4)
-
Step 300
300
#99C5F4
oklch(80.9% 0.082 250.5)
-
Step 400
400 (this color)
#559CE5
oklch(67.8% 0.13 250.9)
-
Step 500
500
#258CE9
oklch(63.1% 0.166 250.9)
-
Step 600
600
#0075CD
oklch(55.6% 0.161 250.9)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900
#014378
oklch(37.8% 0.108 250.5)
-
Step 950
950
#062746
oklch(26.8% 0.069 250.9)
#559CE5 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) | #7CA0E8 | 0.044 |
| Deuteranopia (no green cones) | #6992E4 | 0.031 |
| Tritanopia (no blue cones) | #00ADB6 | 0.104 |
| Achromatopsia (no color) | #989898 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559CE5
#559CE5
oklch(67.8% 0.13 250.9)
- #CA882C
#CA882C
oklch(67.8% 0.13 70.4)
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 #559CE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.027
- Chefchaouen Blue #4895EF ΔE 0.029
- Dark Sky Blue #448EE4 ΔE 0.043
- Soft Blue #6488EA ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.066
- Faded Blue #658CBB ΔE 0.067
- Perrywinkle #8F8CE7 ΔE 0.074
- Periwinkle Blue #8F99FB ΔE 0.075
Use #559CE5 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.