#559BDC
Closest named color: Cornflower Blue (#6495ED). oklch(67.2% 0.12 248.4), rgb(85, 155, 220).
Aa
Black text reads best on this color (7.10:1).
About this color
#559BDC is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.120 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.036 away. Black text reads best on it, at 7.10:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.10:1 |
| White text | 2.95:1 |
Values
| HEX | #559BDC |
| RGB | rgb(85, 155, 220) |
| HSL | hsl(209, 66%, 60%) |
| OKLCH | oklch(67.2% 0.12 248.4) |
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 #559BDC | 2.95:1 | Fails | Lc -61.2 | Content text, not long reading |
| Black text on #559BDC | 7.10:1 | AAA | Lc 48.2 | Large or bold text, headings |
| #559BDC text on white | 2.95:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #559BDC text on black | 7.10:1 | AAA | Lc -45.9 | 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
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF4
oklch(88.4% 0.042 248.3)
-
Step 300
300
#9BC5EF
oklch(80.8% 0.075 248.8)
-
Step 400
400 (this color)
#559BDC
oklch(67.2% 0.12 248.4)
-
Step 500
500
#298EE1
oklch(63.1% 0.154 248.5)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#034474
oklch(37.8% 0.101 248.4)
-
Step 950
950
#072844
oklch(27% 0.064 248.5)
#559BDC 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) | #7F9DDF | 0.046 |
| Deuteranopia (no green cones) | #6D90DB | 0.035 |
| Tritanopia (no blue cones) | #00AAB2 | 0.095 |
| Achromatopsia (no color) | #969696 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BDC
#559BDC
oklch(67.2% 0.12 248.4)
- #C68739
#C68739
oklch(67.3% 0.121 68.7)
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 #559BDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.044
- Faded Blue #658CBB ΔE 0.056
- Soft Blue #6488EA ΔE 0.060
- Greyblue #77A1B5 ΔE 0.073
- Dodger Blue #1E90FF ΔE 0.074
- Water Blue #0E87CC ΔE 0.077
Use #559BDC 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.