#559FEF
Closest named color: Cornflower Blue (#6495ED). oklch(69% 0.14 252.1), rgb(85, 159, 239).
Aa
Black text reads best on this color (7.59:1).
About this color
#559FEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.140 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.028 away. Black text reads best on it, at 7.59:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.59:1 |
| White text | 2.76:1 |
Values
| HEX | #559FEF |
| RGB | rgb(85, 159, 239) |
| HSL | hsl(211, 83%, 64%) |
| OKLCH | oklch(69% 0.14 252.1) |
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 #559FEF | 2.76:1 | Fails | Lc -58.4 | Large or bold text, headings |
| Black text on #559FEF | 7.59:1 | AAA | Lc 50.9 | Large or bold text, headings |
| #559FEF text on white | 2.76:1 | Fails | Lc 53.1 | Large or bold text, headings |
| #559FEF text on black | 7.59:1 | AAA | Lc -48.7 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCF9
oklch(88.5% 0.048 252.2)
-
Step 300
300
#98C5F8
oklch(81% 0.087 252)
-
Step 400
400 (this color)
#559FEF
oklch(69% 0.14 252.1)
-
Step 500
500
#1B8BF1
oklch(63.2% 0.179 252)
-
Step 600
600
#0074D1
oklch(55.7% 0.167 252.1)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#00427B
oklch(37.7% 0.113 252.1)
-
Step 950
950
#052749
oklch(27% 0.074 252.3)
#559FEF 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) | #7CA3F2 | 0.043 |
| Deuteranopia (no green cones) | #6795ED | 0.029 |
| Tritanopia (no blue cones) | #00B2BC | 0.111 |
| Achromatopsia (no color) | #9B9B9B | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FEF
#559FEF
oklch(69% 0.14 252.1)
- #D08B1D
#D08B1D
oklch(69% 0.14 72)
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 #559FEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.051
- Soft Blue #6488EA ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.063
- Periwinkle Blue #8F99FB ΔE 0.068
- Perrywinkle #8F8CE7 ΔE 0.075
- Lavender Blue #8B88F8 ΔE 0.082
Use #559FEF 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.