#559DF4
Closest named color: Cornflower Blue (#6495ED). oklch(68.9% 0.148 254.4), rgb(85, 157, 244).
Aa
Black text reads best on this color (7.51:1).
About this color
#559DF4 is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.148 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.023 away. Black text reads best on it, at 7.51:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.51:1 |
| White text | 2.79:1 |
Values
| HEX | #559DF4 |
| RGB | rgb(85, 157, 244) |
| HSL | hsl(213, 88%, 65%) |
| OKLCH | oklch(68.9% 0.148 254.4) |
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 #559DF4 | 2.79:1 | Fails | Lc -58.8 | Large or bold text, headings |
| Black text on #559DF4 | 7.51:1 | AAA | Lc 50.5 | Large or bold text, headings |
| #559DF4 text on white | 2.79:1 | Fails | Lc 53.5 | Large or bold text, headings |
| #559DF4 text on black | 7.51:1 | AAA | Lc -48.3 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DCFB
oklch(88.6% 0.051 253.9)
-
Step 300
300
#98C4FC
oklch(80.9% 0.093 254.7)
-
Step 400
400 (this color)
#559DF4
oklch(68.9% 0.148 254.4)
-
Step 500
500
#1F88F8
oklch(63% 0.19 254.6)
-
Step 600
600
#0071D8
oklch(55.5% 0.179 254.5)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800
#004E98
oklch(42.8% 0.138 254.3)
-
Step 900
900
#004080
oklch(37.6% 0.123 254.7)
-
Step 950
950
#05264B
oklch(26.9% 0.078 254.4)
#559DF4 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) | #77A3F8 | 0.040 |
| Deuteranopia (no green cones) | #6094F2 | 0.024 |
| Tritanopia (no blue cones) | #00B1BD | 0.118 |
| Achromatopsia (no color) | #9B9B9B | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559DF4
#559DF4
oklch(68.9% 0.148 254.4)
- #CF8B00
#CF8B00
oklch(68.8% 0.146 74.4)
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 #559DF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.023
- Chefchaouen Blue #4895EF ΔE 0.026
- Dark Sky Blue #448EE4 ΔE 0.048
- Soft Blue #6488EA ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.056
- Periwinkle Blue #8F99FB ΔE 0.065
- Perrywinkle #8F8CE7 ΔE 0.073
- Lavender Blue #8B88F8 ΔE 0.077
Use #559DF4 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.