#557CD3
Closest named color: Windows Blue (#3778BF). oklch(59.9% 0.14 264.4), rgb(85, 124, 211).
Aa
Black text reads best on this color (5.20:1).
About this color
#557CD3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.140 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.045 away. Black text reads best on it, at 5.20:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.20:1 |
| White text | 4.03:1 |
Values
| HEX | #557CD3 |
| RGB | rgb(85, 124, 211) |
| HSL | hsl(221, 59%, 58%) |
| OKLCH | oklch(59.9% 0.14 264.4) |
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 #557CD3 | 4.03:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #557CD3 | 5.20:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #557CD3 text on white | 4.03:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #557CD3 text on black | 5.20:1 | AA | Lc -34.3 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ABC1EE
oklch(81% 0.068 264.5)
-
Step 400
400
#7E9FE5
oklch(70.6% 0.11 264.5)
-
Step 500
500 (this color)
#557CD3
oklch(59.9% 0.14 264.4)
-
Step 600
600
#456ECB
oklch(55.6% 0.151 264.2)
-
Step 700
700
#375BB0
oklch(49.1% 0.142 264.5)
-
Step 800
800
#2E4B8E
oklch(42.7% 0.116 264.4)
-
Step 900
900
#293F72
oklch(37.7% 0.092 264.8)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#557CD3 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) | #5685D6 | 0.024 |
| Deuteranopia (no green cones) | #4479D1 | 0.020 |
| Tritanopia (no blue cones) | #008F9D | 0.121 |
| Achromatopsia (no color) | #7F7F7F | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557CD3
#557CD3
oklch(59.9% 0.14 264.4)
- #A27800
#A27800
oklch(59.8% 0.123 84)
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 #557CD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.045
- Soft Blue #6488EA ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.050
- Water Blue #0E87CC ΔE 0.053
- Cool Blue #4984B8 ΔE 0.053
- Steel Blue #4682B4 ΔE 0.057
- Cornflower #6A79F7 ΔE 0.062
- Royal Blue #4169E1 ΔE 0.062
Use #557CD3 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.