#559FE5
Closest named color: Cornflower Blue (#6495ED). oklch(68.5% 0.128 249), rgb(85, 159, 229).
Aa
Black text reads best on this color (7.47:1).
About this color
#559FE5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.128 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.034 away. Black text reads best on it, at 7.47:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.47:1 |
| White text | 2.80:1 |
Values
| HEX | #559FE5 |
| RGB | rgb(85, 159, 229) |
| HSL | hsl(209, 73%, 62%) |
| OKLCH | oklch(68.5% 0.128 249) |
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 #559FE5 | 2.80:1 | Fails | Lc -59.0 | Large or bold text, headings |
| Black text on #559FE5 | 7.47:1 | AAA | Lc 50.3 | Large or bold text, headings |
| #559FE5 text on white | 2.80:1 | Fails | Lc 53.8 | Large or bold text, headings |
| #559FE5 text on black | 7.47:1 | AAA | Lc -48.1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFECF9
oklch(93.7% 0.022 248.1)
-
Step 200
200
#C3DCF6
oklch(88.4% 0.045 249.4)
-
Step 300
300
#99C5F2
oklch(80.8% 0.079 249.4)
-
Step 400
400 (this color)
#559FE5
oklch(68.5% 0.128 249)
-
Step 500
500
#1E8DE7
oklch(63% 0.164 249.3)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004376
oklch(37.6% 0.105 249.5)
-
Step 950
950
#052846
oklch(27.1% 0.068 249.1)
#559FE5 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) | #81A2E8 | 0.048 |
| Deuteranopia (no green cones) | #6D94E4 | 0.035 |
| Tritanopia (no blue cones) | #00AFB8 | 0.099 |
| Achromatopsia (no color) | #9A9A9A | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559FE5
#559FE5
oklch(68.5% 0.128 249)
- #CC8A34
#CC8A34
oklch(68.5% 0.127 69.4)
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 #559FE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.037
- Dark Sky Blue #448EE4 ΔE 0.051
- Soft Blue #6488EA ΔE 0.063
- Faded Blue #658CBB ΔE 0.071
- Dodger Blue #1E90FF ΔE 0.072
- Periwinkle Blue #8F99FB ΔE 0.075
- Perrywinkle #8F8CE7 ΔE 0.078
Use #559FE5 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.