#557DD3
Closest named color: Windows Blue (#3778BF). oklch(60.1% 0.139 263.9), rgb(85, 125, 211).
Aa
Black text reads best on this color (5.26:1).
About this color
#557DD3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.139 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.046 away. Black text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.26:1 |
| White text | 3.99:1 |
Values
| HEX | #557DD3 |
| RGB | rgb(85, 125, 211) |
| HSL | hsl(221, 59%, 58%) |
| OKLCH | oklch(60.1% 0.139 263.9) |
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 #557DD3 | 3.99:1 | AA large text | Lc -72.5 | Content text, not long reading |
| Black text on #557DD3 | 5.26:1 | AA | Lc 37.1 | Non-text elements, placeholder text |
| #557DD3 text on white | 3.99:1 | AA large text | Lc 67.0 | Content text, not long reading |
| #557DD3 text on black | 5.26:1 | AA | Lc -34.6 | 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 500.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDDAF3
oklch(88.6% 0.037 263.6)
-
Step 300
300
#AAC1ED
oklch(80.9% 0.067 263.3)
-
Step 400
400
#7EA0E5
oklch(70.8% 0.108 263.8)
-
Step 500
500 (this color)
#557DD3
oklch(60.1% 0.139 263.9)
-
Step 600
600
#446ECB
oklch(55.6% 0.152 263.9)
-
Step 700
700
#365CAF
oklch(49.2% 0.139 263.6)
-
Step 800
800
#2D4B8E
oklch(42.7% 0.117 264)
-
Step 900
900
#283F71
oklch(37.6% 0.091 264)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#557DD3 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) | #5785D6 | 0.022 |
| Deuteranopia (no green cones) | #467AD1 | 0.019 |
| Tritanopia (no blue cones) | #00909E | 0.120 |
| Achromatopsia (no color) | #7F7F7F | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557DD3
#557DD3
oklch(60.1% 0.139 263.9)
- #A37900
#A37900
oklch(60.1% 0.123 84.2)
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 #557DD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.046
- Soft Blue #6488EA ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.048
- Water Blue #0E87CC ΔE 0.051
- Cool Blue #4984B8 ΔE 0.052
- Steel Blue #4682B4 ΔE 0.056
- Cornflower #6A79F7 ΔE 0.063
- Royal Blue #4169E1 ΔE 0.065
Use #557DD3 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.