#557CBA
Closest named color: Cool Blue (#4984B8). oklch(58.5% 0.105 259.3), rgb(85, 124, 186).
Aa
Black text reads best on this color (4.97:1).
About this color
#557CBA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.105 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.025 away. Black text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 4.97:1 |
| White text | 4.21:1 |
Values
| HEX | #557CBA |
| RGB | rgb(85, 124, 186) |
| HSL | hsl(217, 42%, 53%) |
| OKLCH | oklch(58.5% 0.105 259.3) |
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 #557CBA | 4.21:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #557CBA | 4.97:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #557CBA text on white | 4.21:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #557CBA text on black | 4.97:1 | AA | Lc -32.7 | 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
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2E0
oklch(80.9% 0.047 259.5)
-
Step 400
400
#84A2D0
oklch(70.7% 0.076 258.8)
-
Step 500
500
#668AC4
oklch(63.1% 0.097 259.7)
-
Step 600
600 (this color)
#557CBA
oklch(58.5% 0.105 259.3)
-
Step 700
700
#3E6198
oklch(49.2% 0.098 259.1)
-
Step 800
800
#334F7B
oklch(42.7% 0.081 259.1)
-
Step 900
900
#2D4263
oklch(37.7% 0.063 259.2)
-
Step 950
950
#1A273A
oklch(27% 0.04 257.8)
#557CBA 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) | #6380BD | 0.021 |
| Deuteranopia (no green cones) | #5777B9 | 0.014 |
| Tritanopia (no blue cones) | #1B8A92 | 0.095 |
| Achromatopsia (no color) | #7B7B7B | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557CBA
#557CBA
oklch(58.5% 0.105 259.3)
- #9D7426
#9D7426
oklch(58.6% 0.106 79.6)
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 #557CBA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.025
- Steel Blue #4682B4 ΔE 0.025
- Off Blue #5684AE ΔE 0.033
- Windows Blue #3778BF ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.040
- Flat Blue #3C73A8 ΔE 0.046
- Stormy Blue #507B9C ΔE 0.048
- Cerulean #457B9D ΔE 0.050
Use #557CBA 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.