#559CE2
Closest named color: Cornflower Blue (#6495ED). oklch(67.7% 0.127 249.9), rgb(85, 156, 226).
Aa
Black text reads best on this color (7.23:1).
About this color
#559CE2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.127 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.031 away. Black text reads best on it, at 7.23:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.23:1 |
| White text | 2.90:1 |
Values
| HEX | #559CE2 |
| RGB | rgb(85, 156, 226) |
| HSL | hsl(210, 71%, 61%) |
| OKLCH | oklch(67.7% 0.127 249.9) |
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 #559CE2 | 2.90:1 | Fails | Lc -60.4 | Content text, not long reading |
| Black text on #559CE2 | 7.23:1 | AAA | Lc 48.9 | Large or bold text, headings |
| #559CE2 text on white | 2.90:1 | Fails | Lc 55.1 | Large or bold text, headings |
| #559CE2 text on black | 7.23:1 | AAA | Lc -46.7 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF6
oklch(88.5% 0.044 250.4)
-
Step 300
300
#9AC5F2
oklch(80.9% 0.079 250)
-
Step 400
400 (this color)
#559CE2
oklch(67.7% 0.127 249.9)
-
Step 500
500
#258DE6
oklch(63.1% 0.162 249.8)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#014377
oklch(37.7% 0.106 250.1)
-
Step 950
950
#072845
oklch(27.1% 0.066 249.3)
#559CE2 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) | #7E9FE5 | 0.045 |
| Deuteranopia (no green cones) | #6B91E1 | 0.034 |
| Tritanopia (no blue cones) | #00ACB5 | 0.100 |
| Achromatopsia (no color) | #989898 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559CE2
#559CE2
oklch(67.7% 0.127 249.9)
- #C98831
#C98831
oklch(67.8% 0.127 69.9)
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 #559CE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.031
- Chefchaouen Blue #4895EF ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.044
- Soft Blue #6488EA ΔE 0.057
- Faded Blue #658CBB ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.069
- Perrywinkle #8F8CE7 ΔE 0.076
- Periwinkle Blue #8F99FB ΔE 0.077
Use #559CE2 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.