#557AA0
Closest named color: Stormy Blue (#507B9C). oklch(56.7% 0.073 249.9), rgb(85, 122, 160).
Aa
Black text reads best on this color (4.67:1).
About this color
#557AA0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.073 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.010 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.67:1 |
| White text | 4.48:1 |
Values
| HEX | #557AA0 |
| RGB | rgb(85, 122, 160) |
| HSL | hsl(210, 31%, 48%) |
| OKLCH | oklch(56.7% 0.073 249.9) |
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 #557AA0 | 4.48:1 | AA large text | Lc -76.6 | Fine for body text |
| Black text on #557AA0 | 4.67:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #557AA0 text on white | 4.48:1 | AA large text | Lc 71.1 | Content text, not long reading |
| #557AA0 text on black | 4.67:1 | AA | Lc -30.6 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D0DAE5
oklch(88.4% 0.019 250.6)
-
Step 300
300
#B1C3D5
oklch(80.9% 0.032 248.2)
-
Step 400
400
#88A4C0
oklch(70.7% 0.052 248.6)
-
Step 500
500
#6A8DB1
oklch(63.1% 0.067 249.6)
-
Step 600
600 (this color)
#557AA0
oklch(56.7% 0.073 249.9)
-
Step 700
700
#426486
oklch(49.2% 0.068 249.3)
-
Step 800
800
#37516D
oklch(42.6% 0.057 251)
-
Step 900
900
#304358
oklch(37.6% 0.044 251.5)
-
Step 950
950
#1C2834
oklch(27.1% 0.028 248.9)
#557AA0 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) | #6B7BA2 | 0.029 |
| Deuteranopia (no green cones) | #61739F | 0.023 |
| Tritanopia (no blue cones) | #368387 | 0.062 |
| Achromatopsia (no color) | #777777 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557AA0
#557AA0
oklch(56.7% 0.073 249.9)
- #926F46
#926F46
oklch(56.7% 0.072 69.9)
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 #557AA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.010
- Cerulean #457B9D ΔE 0.018
- Dull Blue #49759C ΔE 0.022
- Off Blue #5684AE ΔE 0.032
- Metallic Blue #4F738E ΔE 0.033
- Steel Blue #4682B4 ΔE 0.034
- Grey Blue #647D8E ΔE 0.036
- Dusty Blue #5A86AD ΔE 0.037
Use #557AA0 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.