#556B74
Closest named color: Slate (#516572). oklch(51.3% 0.03 224.7), rgb(85, 107, 116).
Aa
White text reads best on this color (5.61:1).
About this color
#556B74 is a medium-dark close to neutral grey. In OKLCH its lightness is 51%, its chroma 0.030. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.019 away. White text reads best on it, at 5.61:1.
| Hue family | Neutrals |
| Lightness | medium-dark (51%) |
| Chroma | close to neutral grey (0.030) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.74:1 |
| White text | 5.61:1 |
Values
| HEX | #556B74 |
| RGB | rgb(85, 107, 116) |
| HSL | hsl(197, 15%, 39%) |
| OKLCH | oklch(51.3% 0.03 224.7) |
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 #556B74 | 5.61:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #556B74 | 3.74:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #556B74 text on white | 5.61:1 | AA | Lc 78.1 | Fine for body text |
| #556B74 text on black | 3.74:1 | AA large text | Lc -23.7 | 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
#B7C3C8
oklch(80.9% 0.015 224.5)
-
Step 400
400
#92A4AB
oklch(70.7% 0.023 223.1)
-
Step 500
500
#778E97
oklch(63.2% 0.03 223.5)
-
Step 600
600
#607882
oklch(55.7% 0.032 225.1)
-
Step 700
700 (this color)
#556B74
oklch(51.3% 0.03 224.7)
-
Step 800
800
#415259
oklch(42.7% 0.024 224.9)
-
Step 900
900
#374449
oklch(37.7% 0.019 223.2)
-
Step 950
950
#20282B
oklch(27% 0.013 222.5)
#556B74 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) | #666A75 | 0.024 |
| Deuteranopia (no green cones) | #616674 | 0.021 |
| Tritanopia (no blue cones) | #4C6E6E | 0.019 |
| Achromatopsia (no color) | #686868 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556B74
#556B74
oklch(51.3% 0.03 224.7)
- #766259
#766259
oklch(51.3% 0.03 45.6)
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 #556B74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.019
- Dim Gray #696969 ΔE 0.031
- Metallic Blue #4F738E ΔE 0.041
- Battleship Gray #6C757D ΔE 0.047
- Denim #3B638C ΔE 0.060
- Deep Aqua #08787F ΔE 0.061
- Dusty Grape #545775 ΔE 0.062
- Dull Blue #49759C ΔE 0.062
Use #556B74 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.