#5571B9
Closest named color: Windows Blue (#3778BF). oklch(56% 0.117 266.6), rgb(85, 113, 185).
Aa
White text reads best on this color (4.72:1).
About this color
#5571B9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.117 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. White text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.44:1 |
| White text | 4.72:1 |
Values
| HEX | #5571B9 |
| RGB | rgb(85, 113, 185) |
| HSL | hsl(223, 42%, 53%) |
| OKLCH | oklch(56% 0.117 266.6) |
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 #5571B9 | 4.72:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #5571B9 | 4.44:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #5571B9 text on white | 4.72:1 | AA | Lc 72.6 | Content text, not long reading |
| #5571B9 text on black | 4.44:1 | AA large text | Lc -29.1 | Dividers and decoration only |
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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0D9ED
oklch(88.5% 0.029 266.4)
-
Step 300
300
#B1C0E4
oklch(80.8% 0.054 267.4)
-
Step 400
400
#899FD6
oklch(70.6% 0.085 267.4)
-
Step 500
500
#6C87CB
oklch(63.1% 0.108 266.9)
-
Step 600
600 (this color)
#5571B9
oklch(56% 0.117 266.6)
-
Step 700
700
#445D9E
oklch(49% 0.109 266.6)
-
Step 800
800
#384C80
oklch(42.6% 0.09 266.7)
-
Step 900
900
#304067
oklch(37.7% 0.07 266.2)
-
Step 950
950
#1C263C
oklch(27.1% 0.044 265)
#5571B9 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) | #5478BC | 0.019 |
| Deuteranopia (no green cones) | #486FB7 | 0.017 |
| Tritanopia (no blue cones) | #20818C | 0.105 |
| Achromatopsia (no color) | #737373 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5571B9
#5571B9
oklch(56% 0.117 266.6)
- #926F00
#926F00
oklch(56.1% 0.115 86.6)
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 #5571B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- French Blue #436BAD ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.040
- Steel Blue #4682B4 ΔE 0.051
- Muted Blue #3B719F ΔE 0.052
- Mid Blue #276AB3 ΔE 0.052
- Dull Blue #49759C ΔE 0.053
- Cool Blue #4984B8 ΔE 0.054
Use #5571B9 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.