#557AC3
Closest named color: Windows Blue (#3778BF). oklch(58.6% 0.12 262.9), rgb(85, 122, 195).
Aa
Black text reads best on this color (4.95:1).
About this color
#557AC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.120 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #557AC3 |
| RGB | rgb(85, 122, 195) |
| HSL | hsl(220, 48%, 55%) |
| OKLCH | oklch(58.6% 0.12 262.9) |
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 #557AC3 | 4.23:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #557AC3 | 4.95:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #557AC3 text on white | 4.23:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #557AC3 text on black | 4.95:1 | AA | Lc -32.6 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CFDAEE
oklch(88.6% 0.03 262.5)
-
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
#6588CC
oklch(63% 0.111 262.9)
-
Step 600
600 (this color)
#557AC3
oklch(58.6% 0.12 262.9)
-
Step 700
700
#3E5EA0
oklch(49% 0.113 263.3)
-
Step 800
800
#334D81
oklch(42.6% 0.092 263)
-
Step 900
900
#2D4168
oklch(37.8% 0.072 262.8)
-
Step 950
950
#1A263D
oklch(27% 0.046 262.7)
#557AC3 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) | #5C80C6 | 0.019 |
| Deuteranopia (no green cones) | #4E76C1 | 0.014 |
| Tritanopia (no blue cones) | #058A95 | 0.108 |
| Achromatopsia (no color) | #7B7B7B | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557AC3
#557AC3
oklch(58.6% 0.12 262.9)
- #9E7401
#9E7401
oklch(58.5% 0.12 83.2)
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 #557AC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Cool Blue #4984B8 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.039
- Off Blue #5684AE ΔE 0.048
- Water Blue #0E87CC ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.054
- Dusty Blue #5A86AD ΔE 0.055
- French Blue #436BAD ΔE 0.056
Use #557AC3 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.