#557BC3
Closest named color: Windows Blue (#3778BF). oklch(58.8% 0.119 262.2), rgb(85, 123, 195).
Aa
Black text reads best on this color (5.00:1).
About this color
#557BC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.119 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #557BC3 |
| RGB | rgb(85, 123, 195) |
| HSL | hsl(219, 48%, 55%) |
| OKLCH | oklch(58.8% 0.119 262.2) |
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 #557BC3 | 4.19:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #557BC3 | 5.00:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #557BC3 text on white | 4.19:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #557BC3 text on black | 5.00:1 | AA | Lc -32.9 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CFDAED
oklch(88.6% 0.029 261.5)
-
Step 300
300
#AEC1E4
oklch(80.8% 0.054 262.6)
-
Step 400
400
#84A1D7
oklch(70.8% 0.086 262.5)
-
Step 500
500
#6589CC
oklch(63.2% 0.109 262.2)
-
Step 600
600 (this color)
#557BC3
oklch(58.8% 0.119 262.2)
-
Step 700
700
#3D5F9F
oklch(49.1% 0.11 262)
-
Step 800
800
#334E81
oklch(42.8% 0.091 262.1)
-
Step 900
900
#2C4167
oklch(37.7% 0.071 261.6)
-
Step 950
950
#1A263D
oklch(27% 0.046 262.7)
#557BC3 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) | #5D81C6 | 0.020 |
| Deuteranopia (no green cones) | #5077C1 | 0.013 |
| Tritanopia (no blue cones) | #048B96 | 0.106 |
| Achromatopsia (no color) | #7C7C7C | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557BC3
#557BC3
oklch(58.8% 0.119 262.2)
- #9F7408
#9F7408
oklch(58.7% 0.119 82.1)
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 #557BC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- Cool Blue #4984B8 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Off Blue #5684AE ΔE 0.046
- Water Blue #0E87CC ΔE 0.050
- Dusty Blue #5A86AD ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.054
- Faded Blue #658CBB ΔE 0.057
Use #557BC3 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.