#556381
Closest named color: Slate (#516572). oklch(50% 0.051 265.1), rgb(85, 99, 129).
Aa
White text reads best on this color (6.02:1).
About this color
#556381 is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.051 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.028 away. White text reads best on it, at 6.02:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.48:1 |
| White text | 6.02:1 |
Values
| HEX | #556381 |
| RGB | rgb(85, 99, 129) |
| HSL | hsl(221, 21%, 42%) |
| OKLCH | oklch(50% 0.051 265.1) |
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 #556381 | 6.02:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #556381 | 3.48:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #556381 text on white | 6.02:1 | AA | Lc 80.1 | Fine for body text |
| #556381 text on black | 3.48:1 | AA large text | Lc -21.8 | Dividers and decoration only |
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 700.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D5D9E3
oklch(88.5% 0.014 268.5)
-
Step 300
300
#B9C1D1
oklch(81% 0.024 264.4)
-
Step 400
400
#95A1BA
oklch(70.8% 0.039 265)
-
Step 500
500
#7B89A9
oklch(63% 0.051 266.4)
-
Step 600
600
#647394
oklch(55.6% 0.055 265.6)
-
Step 700
700 (this color)
#556381
oklch(50% 0.051 265.1)
-
Step 800
800
#444F67
oklch(42.8% 0.042 265.5)
-
Step 900
900
#394154
oklch(37.6% 0.034 266.9)
-
Step 950
950
#212631
oklch(26.9% 0.022 265.8)
#556381 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) | #596582 | 0.009 |
| Deuteranopia (no green cones) | #556180 | 0.006 |
| Tritanopia (no blue cones) | #48696D | 0.046 |
| Achromatopsia (no color) | #636363 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556381
#556381
oklch(50% 0.051 265.1)
- #716141
#716141
oklch(50% 0.051 84.1)
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 #556381, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.028
- Denim #3B638C ΔE 0.035
- Dusty Grape #545775 ΔE 0.036
- Dusky Blue #475F94 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.042
- Metallic Blue #4F738E ΔE 0.046
- Dusk #4E5481 ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.053
Use #556381 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.