#557FC0
Closest named color: Cool Blue (#4984B8). oklch(59.5% 0.111 258.9), rgb(85, 127, 192).
Aa
Black text reads best on this color (5.18:1).
About this color
#557FC0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.111 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.024 away. Black text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.18:1 |
| White text | 4.05:1 |
Values
| HEX | #557FC0 |
| RGB | rgb(85, 127, 192) |
| HSL | hsl(216, 46%, 54%) |
| OKLCH | oklch(59.5% 0.111 258.9) |
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 #557FC0 | 4.05:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #557FC0 | 5.18:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #557FC0 text on white | 4.05:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #557FC0 text on black | 5.18:1 | AA | Lc -34.1 | 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 500.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#80A2D7
oklch(70.7% 0.087 259.1)
-
Step 500
500 (this color)
#557FC0
oklch(59.5% 0.111 258.9)
-
Step 600
600
#4673B9
oklch(55.7% 0.12 258.9)
-
Step 700
700
#37609F
oklch(49.1% 0.112 258.7)
-
Step 800
800
#2E4F81
oklch(42.8% 0.092 258.5)
-
Step 900
900
#294268
oklch(37.8% 0.072 258.5)
-
Step 950
950
#18273D
oklch(27.1% 0.046 257.8)
#557FC0 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) | #6584C3 | 0.025 |
| Deuteranopia (no green cones) | #577ABF | 0.014 |
| Tritanopia (no blue cones) | #0C8D97 | 0.097 |
| Achromatopsia (no color) | #7E7E7E | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557FC0
#557FC0
oklch(59.5% 0.111 258.9)
- #A27622
#A27622
oklch(59.6% 0.111 79)
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 #557FC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.024
- Steel Blue #4682B4 ΔE 0.027
- Off Blue #5684AE ΔE 0.035
- Windows Blue #3778BF ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.040
- Faded Blue #658CBB ΔE 0.045
- Water Blue #0E87CC ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.056
Use #557FC0 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.