#557FB4
Closest named color: Steel Blue (#4682B4). oklch(58.9% 0.094 254.8), rgb(85, 127, 180).
Aa
Black text reads best on this color (5.08:1).
About this color
#557FB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.094 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.016 away. Black text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.08:1 |
| White text | 4.13:1 |
Values
| HEX | #557FB4 |
| RGB | rgb(85, 127, 180) |
| HSL | hsl(213, 39%, 52%) |
| OKLCH | oklch(58.9% 0.094 254.8) |
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 #557FB4 | 4.13:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #557FB4 | 5.08:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #557FB4 text on white | 4.13:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #557FB4 text on black | 5.08:1 | AA | Lc -33.4 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AFC3DC
oklch(81% 0.042 254.1)
-
Step 400
400
#84A3CB
oklch(70.7% 0.068 255)
-
Step 500
500
#658CBD
oklch(63.1% 0.086 254.6)
-
Step 600
600 (this color)
#557FB4
oklch(58.9% 0.094 254.8)
-
Step 700
700
#3D6292
oklch(49.1% 0.088 255.5)
-
Step 800
800
#325076
oklch(42.6% 0.073 254.9)
-
Step 900
900
#2C435F
oklch(37.7% 0.056 253.9)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#557FB4 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) | #6A82B6 | 0.028 |
| Deuteranopia (no green cones) | #5E79B3 | 0.018 |
| Tritanopia (no blue cones) | #228B92 | 0.083 |
| Achromatopsia (no color) | #7D7D7D | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557FB4
#557FB4
oklch(58.9% 0.094 254.8)
- #9E7437
#9E7437
oklch(58.9% 0.094 74.3)
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 #557FB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.016
- Cool Blue #4984B8 ΔE 0.017
- Off Blue #5684AE ΔE 0.019
- Dusty Blue #5A86AD ΔE 0.026
- Stormy Blue #507B9C ΔE 0.038
- Cerulean #457B9D ΔE 0.041
- Windows Blue #3778BF ΔE 0.042
- Faded Blue #658CBB ΔE 0.043
Use #557FB4 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.