#559BE5
Closest named color: Cornflower Blue (#6495ED). oklch(67.6% 0.131 251.5), rgb(85, 155, 229).
Aa
Black text reads best on this color (7.20:1).
About this color
#559BE5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.131 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.026 away. Black text reads best on it, at 7.20:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.20:1 |
| White text | 2.91:1 |
Values
| HEX | #559BE5 |
| RGB | rgb(85, 155, 229) |
| HSL | hsl(211, 73%, 62%) |
| OKLCH | oklch(67.6% 0.131 251.5) |
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 #559BE5 | 2.91:1 | Fails | Lc -60.6 | Content text, not long reading |
| Black text on #559BE5 | 7.20:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #559BE5 text on white | 2.91:1 | Fails | Lc 55.3 | Large or bold text, headings |
| #559BE5 text on black | 7.20:1 | AAA | Lc -46.5 | 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
#9AC5F4
oklch(81% 0.081 251.1)
-
Step 400
400 (this color)
#559BE5
oklch(67.6% 0.131 251.5)
-
Step 500
500
#278CEA
oklch(63.2% 0.167 251.4)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#024279
oklch(37.6% 0.11 251.7)
-
Step 950
950
#072747
oklch(26.9% 0.07 252)
#559BE5 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) | #7B9FE8 | 0.043 |
| Deuteranopia (no green cones) | #6791E4 | 0.030 |
| Tritanopia (no blue cones) | #00ACB6 | 0.104 |
| Achromatopsia (no color) | #979797 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BE5
#559BE5
oklch(67.6% 0.131 251.5)
- #C98828
#C98828
oklch(67.7% 0.132 71.6)
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 #559BE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.026
- Chefchaouen Blue #4895EF ΔE 0.027
- Dark Sky Blue #448EE4 ΔE 0.040
- Soft Blue #6488EA ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.064
- Faded Blue #658CBB ΔE 0.066
- Perrywinkle #8F8CE7 ΔE 0.073
- Periwinkle Blue #8F99FB ΔE 0.075
Use #559BE5 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.