#557BC5
Closest named color: Windows Blue (#3778BF). oklch(58.9% 0.122 262.6), rgb(85, 123, 197).
Aa
Black text reads best on this color (5.02:1).
About this color
#557BC5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.122 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. Black text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.02:1 |
| White text | 4.17:1 |
Values
| HEX | #557BC5 |
| RGB | rgb(85, 123, 197) |
| HSL | hsl(220, 49%, 55%) |
| OKLCH | oklch(58.9% 0.122 262.6) |
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 #557BC5 | 4.17:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #557BC5 | 5.02:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #557BC5 text on white | 4.17:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #557BC5 text on black | 5.02:1 | AA | Lc -33.0 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
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
#AEC1E5
oklch(80.9% 0.055 263.2)
-
Step 400
400
#83A1D8
oklch(70.7% 0.088 262.2)
-
Step 500
500
#6488CD
oklch(63% 0.112 262.6)
-
Step 600
600 (this color)
#557BC5
oklch(58.9% 0.122 262.6)
-
Step 700
700
#3D5EA1
oklch(49% 0.114 263.1)
-
Step 800
800
#324D82
oklch(42.6% 0.094 262.7)
-
Step 900
900
#2C4168
oklch(37.7% 0.072 262)
-
Step 950
950
#1A263D
oklch(27% 0.046 262.7)
#557BC5 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) | #5C82C8 | 0.022 |
| Deuteranopia (no green cones) | #4E77C3 | 0.014 |
| Tritanopia (no blue cones) | #008B96 | 0.109 |
| Achromatopsia (no color) | #7C7C7C | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557BC5
#557BC5
oklch(58.9% 0.122 262.6)
- #A07500
#A07500
oklch(59% 0.121 82.8)
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 #557BC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Cool Blue #4984B8 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.039
- Off Blue #5684AE ΔE 0.049
- Water Blue #0E87CC ΔE 0.050
- Dusty Blue #5A86AD ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.057
- Faded Blue #658CBB ΔE 0.059
Use #557BC5 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.