#557CC0
Closest named color: Cool Blue (#4984B8). oklch(58.8% 0.114 260.9), rgb(85, 124, 192).
Aa
Black text reads best on this color (5.03:1).
About this color
#557CC0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.114 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.030 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.03:1 |
| White text | 4.17:1 |
Values
| HEX | #557CC0 |
| RGB | rgb(85, 124, 192) |
| HSL | hsl(218, 46%, 54%) |
| OKLCH | oklch(58.8% 0.114 260.9) |
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 #557CC0 | 4.17:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #557CC0 | 5.03:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #557CC0 text on white | 4.17:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #557CC0 text on black | 5.03:1 | AA | Lc -33.1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AEC2E2
oklch(81% 0.05 259.8)
-
Step 400
400
#84A1D4
oklch(70.6% 0.082 261.5)
-
Step 500
500
#6589C9
oklch(63% 0.105 261.4)
-
Step 600
600 (this color)
#557CC0
oklch(58.8% 0.114 260.9)
-
Step 700
700
#3D609C
oklch(49.2% 0.105 260.6)
-
Step 800
800
#334E7F
oklch(42.7% 0.088 261.5)
-
Step 900
900
#2C4166
oklch(37.6% 0.069 261.2)
-
Step 950
950
#1A263C
oklch(26.9% 0.045 261.9)
#557CC0 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) | #6081C3 | 0.020 |
| Deuteranopia (no green cones) | #5377BF | 0.014 |
| Tritanopia (no blue cones) | #0E8B95 | 0.102 |
| Achromatopsia (no color) | #7C7C7C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557CC0
#557CC0
oklch(58.8% 0.114 260.9)
- #9F7418
#9F7418
oklch(58.7% 0.114 80.7)
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 #557CC0, closest first.
No curated palette has a color within ΔE 0.04 of #557CC0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.030
- Steel Blue #4682B4 ΔE 0.032
- Windows Blue #3778BF ΔE 0.033
- Off Blue #5684AE ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.047
- Water Blue #0E87CC ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.052
- Faded Blue #658CBB ΔE 0.053
Use #557CC0 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.