#556B68
Closest named color: Slate (#516572). oklch(50.9% 0.027 186.2), rgb(85, 107, 104).
Aa
White text reads best on this color (5.69:1).
About this color
#556B68 is a medium-dark close to neutral grey. In OKLCH its lightness is 51%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.029 away. White text reads best on it, at 5.69:1.
| Hue family | Neutrals |
| Lightness | medium-dark (51%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Values
| HEX | #556B68 |
| RGB | rgb(85, 107, 104) |
| HSL | hsl(172, 11%, 38%) |
| OKLCH | oklch(50.9% 0.027 186.2) |
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 #556B68 | 5.69:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #556B68 | 3.68:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #556B68 text on white | 5.69:1 | AA | Lc 78.5 | Fine for body text |
| #556B68 text on black | 3.68:1 | AA large text | Lc -23.3 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E7EBEA
oklch(93.7% 0.004 179.7)
-
Step 200
200
#D4DBDA
oklch(88.6% 0.008 186.9)
-
Step 300
300
#B8C3C2
oklch(80.8% 0.012 190.4)
-
Step 400
400
#93A5A2
oklch(70.7% 0.021 184.7)
-
Step 500
500
#788F8C
oklch(63.1% 0.027 186.9)
-
Step 600
600
#617976
oklch(55.6% 0.028 187.1)
-
Step 700
700 (this color)
#556B68
oklch(50.9% 0.027 186.2)
-
Step 800
800
#425351
oklch(42.7% 0.021 187.6)
-
Step 900
900
#384543
oklch(37.8% 0.017 185.1)
-
Step 950
950
#212827
oklch(27% 0.01 186.1)
#556B68 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) | #696868 | 0.029 |
| Deuteranopia (no green cones) | #646568 | 0.027 |
| Tritanopia (no blue cones) | #4F6C6A | 0.008 |
| Achromatopsia (no color) | #676767 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556B68
#556B68
oklch(50.9% 0.027 186.2)
- #746063
#746063
oklch(51% 0.026 7.9)
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 #556B68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.029
- Dim Gray #696969 ΔE 0.029
- Battleship Gray #6C757D ΔE 0.054
- Metallic Blue #4F738E ΔE 0.058
- Deep Turquoise #017374 ΔE 0.060
- Dark Aquamarine #017371 ΔE 0.060
- Deep Aqua #08787F ΔE 0.063
- Dark Aqua #05696B ΔE 0.064
Use #556B68 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.