#557FC3
Closest named color: Cool Blue (#4984B8). oklch(59.6% 0.115 259.7), rgb(85, 127, 195).
Aa
Black text reads best on this color (5.21:1).
About this color
#557FC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.115 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.027 away. Black text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.21:1 |
| White text | 4.03:1 |
Values
| HEX | #557FC3 |
| RGB | rgb(85, 127, 195) |
| HSL | hsl(217, 48%, 55%) |
| OKLCH | oklch(59.6% 0.115 259.7) |
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 #557FC3 | 4.03:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #557FC3 | 5.21:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #557FC3 text on white | 4.03:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #557FC3 text on black | 5.21:1 | AA | Lc -34.2 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ACC2E5
oklch(80.9% 0.055 259.6)
-
Step 400
400
#7FA2D9
oklch(70.8% 0.09 259.2)
-
Step 500
500 (this color)
#557FC3
oklch(59.6% 0.115 259.7)
-
Step 600
600
#4572BB
oklch(55.5% 0.124 259.6)
-
Step 700
700
#375FA2
oklch(49% 0.117 260.1)
-
Step 800
800
#2E4E83
oklch(42.7% 0.096 260)
-
Step 900
900
#294169
oklch(37.6% 0.075 260.1)
-
Step 950
950
#18263D
oklch(26.8% 0.047 260)
#557FC3 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) | #6384C6 | 0.023 |
| Deuteranopia (no green cones) | #557AC2 | 0.014 |
| Tritanopia (no blue cones) | #018E98 | 0.102 |
| Achromatopsia (no color) | #7F7F7F | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557FC3
#557FC3
oklch(59.6% 0.115 259.7)
- #A3761B
#A3761B
oklch(59.6% 0.115 79.5)
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 #557FC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.027
- Steel Blue #4682B4 ΔE 0.031
- Windows Blue #3778BF ΔE 0.037
- Off Blue #5684AE ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.044
- Water Blue #0E87CC ΔE 0.046
- Faded Blue #658CBB ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.057
Use #557FC3 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.