#556C73
Closest named color: Slate (#516572). oklch(51.5% 0.029 218.3), rgb(85, 108, 115).
Aa
White text reads best on this color (5.55:1).
About this color
#556C73 is a medium-dark close to neutral grey. In OKLCH its lightness is 52%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.023 away. White text reads best on it, at 5.55:1.
| Hue family | Neutrals |
| Lightness | medium-dark (52%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.77:1 |
| White text | 5.55:1 |
Values
| HEX | #556C73 |
| RGB | rgb(85, 108, 115) |
| HSL | hsl(194, 15%, 39%) |
| OKLCH | oklch(51.5% 0.029 218.3) |
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 #556C73 | 5.55:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #556C73 | 3.77:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #556C73 text on white | 5.55:1 | AA | Lc 77.8 | Fine for body text |
| #556C73 text on black | 3.77:1 | AA large text | Lc -24.0 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADD
oklch(88.5% 0.008 228.9)
-
Step 300
300
#B7C3C7
oklch(80.9% 0.014 219.6)
-
Step 400
400
#92A4AA
oklch(70.7% 0.022 219.8)
-
Step 500
500
#768E95
oklch(63% 0.029 217.3)
-
Step 600
600
#5F7880
oklch(55.6% 0.032 219.3)
-
Step 700
700 (this color)
#556C73
oklch(51.5% 0.029 218.3)
-
Step 800
800
#405258
oklch(42.6% 0.024 220.1)
-
Step 900
900
#374448
oklch(37.7% 0.018 218.4)
-
Step 950
950
#20282A
oklch(27% 0.012 214.5)
#556C73 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) | #676A73 | 0.025 |
| Deuteranopia (no green cones) | #626773 | 0.022 |
| Tritanopia (no blue cones) | #4C6F6E | 0.018 |
| Achromatopsia (no color) | #686868 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556C73
#556C73
oklch(51.5% 0.029 218.3)
- #77625B
#77625B
oklch(51.5% 0.029 39.3)
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 #556C73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.023
- Dim Gray #696969 ΔE 0.030
- Metallic Blue #4F738E ΔE 0.042
- Battleship Gray #6C757D ΔE 0.045
- Deep Aqua #08787F ΔE 0.060
- Deep Turquoise #017374 ΔE 0.061
- Battleship Grey #6B7C85 ΔE 0.061
- Dark Aquamarine #017371 ΔE 0.062
Use #556C73 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.