#557ED0
Closest named color: Windows Blue (#3778BF). oklch(60.2% 0.134 262.9), rgb(85, 126, 208).
Aa
Black text reads best on this color (5.28:1).
About this color
#557ED0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.134 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.044 away. Black text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #557ED0 |
| RGB | rgb(85, 126, 208) |
| HSL | hsl(220, 57%, 57%) |
| OKLCH | oklch(60.2% 0.134 262.9) |
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 #557ED0 | 3.97:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #557ED0 | 5.28:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #557ED0 text on white | 3.97:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #557ED0 text on black | 5.28:1 | AA | Lc -34.8 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#ABC1EC
oklch(80.9% 0.066 263.7)
-
Step 400
400
#7EA0E2
oklch(70.7% 0.104 263.1)
-
Step 500
500 (this color)
#557ED0
oklch(60.2% 0.134 262.9)
-
Step 600
600
#446FC7
oklch(55.5% 0.145 262.9)
-
Step 700
700
#365DAC
oklch(49.2% 0.134 262.7)
-
Step 800
800
#2D4C8C
oklch(42.8% 0.112 263)
-
Step 900
900
#284070
oklch(37.8% 0.088 262.8)
-
Step 950
950
#182641
oklch(27.1% 0.054 262.5)
#557ED0 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) | #5B86D3 | 0.023 |
| Deuteranopia (no green cones) | #4A7ACE | 0.017 |
| Tritanopia (no blue cones) | #00909D | 0.116 |
| Achromatopsia (no color) | #808080 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557ED0
#557ED0
oklch(60.2% 0.134 262.9)
- #A47800
#A47800
oklch(60.1% 0.124 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 #557ED0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.044
- Cool Blue #4984B8 ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.047
- Water Blue #0E87CC ΔE 0.049
- Soft Blue #6488EA ΔE 0.049
- Steel Blue #4682B4 ΔE 0.050
- Off Blue #5684AE ΔE 0.059
- Faded Blue #658CBB ΔE 0.060
Use #557ED0 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.