#559BD4
Closest named color: Cornflower Blue (#6495ED). oklch(66.8% 0.111 245.1), rgb(85, 155, 212).
Aa
Black text reads best on this color (7.02:1).
About this color
#559BD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.111 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.047 away. Black text reads best on it, at 7.02:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.02:1 |
| White text | 2.98:1 |
Values
| HEX | #559BD4 |
| RGB | rgb(85, 155, 212) |
| HSL | hsl(207, 60%, 58%) |
| OKLCH | oklch(66.8% 0.111 245.1) |
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 #559BD4 | 2.98:1 | Fails | Lc -61.7 | Content text, not long reading |
| Black text on #559BD4 | 7.02:1 | AAA | Lc 47.7 | Large or bold text, headings |
| #559BD4 text on white | 2.98:1 | Fails | Lc 56.3 | Large or bold text, headings |
| #559BD4 text on black | 7.02:1 | AAA | Lc -45.4 | 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 500.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A4C5E2
oklch(80.9% 0.054 245.1)
-
Step 400
400
#72A6D3
oklch(70.6% 0.086 245.5)
-
Step 500
500 (this color)
#559BD4
oklch(66.8% 0.111 245.1)
-
Step 600
600
#2879B5
oklch(55.7% 0.121 245.2)
-
Step 700
700
#19659B
oklch(49% 0.112 245.2)
-
Step 800
800
#18537E
oklch(42.7% 0.093 244.9)
-
Step 900
900
#1B4565
oklch(37.7% 0.072 244.5)
-
Step 950
950
#11283B
oklch(26.8% 0.046 245.6)
#559BD4 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) | #829CD7 | 0.050 |
| Deuteranopia (no green cones) | #7190D3 | 0.038 |
| Tritanopia (no blue cones) | #00A9AF | 0.087 |
| Achromatopsia (no color) | #959595 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BD4
#559BD4
oklch(66.8% 0.111 245.1)
- #C38545
#C38545
oklch(66.7% 0.111 64.7)
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 #559BD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.047
- Chefchaouen Blue #4895EF ΔE 0.048
- Faded Blue #658CBB ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.051
- Greyblue #77A1B5 ΔE 0.063
- Soft Blue #6488EA ΔE 0.068
- Silver Lake Blue #778DA9 ΔE 0.070
- Dusty Blue #5A86AD ΔE 0.072
Use #559BD4 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.