#557DC3
Closest named color: Cool Blue (#4984B8). oklch(59.2% 0.117 261), rgb(85, 125, 195).
Aa
Black text reads best on this color (5.10:1).
About this color
#557DC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.117 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.031 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #557DC3 |
| RGB | rgb(85, 125, 195) |
| HSL | hsl(218, 48%, 55%) |
| OKLCH | oklch(59.2% 0.117 261) |
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 #557DC3 | 4.11:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #557DC3 | 5.10:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #557DC3 text on white | 4.11:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #557DC3 text on black | 5.10:1 | AA | Lc -33.6 | 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 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
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#AEC2E3
oklch(81% 0.052 260.4)
-
Step 400
400
#83A1D5
oklch(70.6% 0.084 261.2)
-
Step 500
500
#6489CA
oklch(63% 0.107 261.2)
-
Step 600
600 (this color)
#557DC3
oklch(59.2% 0.117 261)
-
Step 700
700
#3C5F9E
oklch(49% 0.109 261.3)
-
Step 800
800
#324E80
oklch(42.7% 0.09 261.2)
-
Step 900
900
#2C4167
oklch(37.7% 0.071 261.6)
-
Step 950
950
#1A263C
oklch(26.9% 0.045 261.9)
#557DC3 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) | #6083C6 | 0.022 |
| Deuteranopia (no green cones) | #5378C2 | 0.014 |
| Tritanopia (no blue cones) | #028D97 | 0.105 |
| Achromatopsia (no color) | #7D7D7D | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557DC3
#557DC3
oklch(59.2% 0.117 261)
- #A17513
#A17513
oklch(59.1% 0.117 80.9)
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 #557DC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.034
- Windows Blue #3778BF ΔE 0.034
- Off Blue #5684AE ΔE 0.042
- Water Blue #0E87CC ΔE 0.047
- Dusty Blue #5A86AD ΔE 0.048
- Faded Blue #658CBB ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.056
Use #557DC3 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.