#5579D3
Closest named color: Windows Blue (#3778BF). oklch(59.3% 0.144 265.8), rgb(85, 121, 211).
Aa
Black text reads best on this color (5.06:1).
About this color
#5579D3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.144 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.044 away. Black text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #5579D3 |
| RGB | rgb(85, 121, 211) |
| HSL | hsl(223, 59%, 58%) |
| OKLCH | oklch(59.3% 0.144 265.8) |
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 #5579D3 | 4.14:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #5579D3 | 5.06:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #5579D3 text on white | 4.14:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #5579D3 text on black | 5.06:1 | AA | Lc -33.3 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ADC0EB
oklch(80.8% 0.065 266.3)
-
Step 400
400
#829FE2
oklch(70.7% 0.104 265.9)
-
Step 500
500
#6386D9
oklch(63.1% 0.132 265.5)
-
Step 600
600 (this color)
#5579D3
oklch(59.3% 0.144 265.8)
-
Step 700
700
#3C5BAC
oklch(49.1% 0.134 265.9)
-
Step 800
800
#324B8B
oklch(42.7% 0.11 265.9)
-
Step 900
900
#2C3F6F
oklch(37.7% 0.086 266.1)
-
Step 950
950
#1A2541
oklch(27% 0.055 266.6)
#5579D3 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) | #5183D6 | 0.026 |
| Deuteranopia (no green cones) | #3F77D1 | 0.024 |
| Tritanopia (no blue cones) | #008D9C | 0.124 |
| Achromatopsia (no color) | #7C7C7C | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5579D3
#5579D3
oklch(59.3% 0.144 265.8)
- #9E7700
#9E7700
oklch(59.2% 0.121 85.6)
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 #5579D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.044
- Soft Blue #6488EA ΔE 0.054
- Royal Blue #4169E1 ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.057
- Water Blue #0E87CC ΔE 0.057
- Cool Blue #4984B8 ΔE 0.058
- Steel Blue #4682B4 ΔE 0.061
- Cornflower #6A79F7 ΔE 0.061
Use #5579D3 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.