#556366
Closest named color: Slate (#516572). oklch(48.9% 0.018 212.1), rgb(85, 99, 102).
Aa
White text reads best on this color (6.24:1).
About this color
#556366 is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.018 away. White text reads best on it, at 6.24:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.36:1 |
| White text | 6.24:1 |
Values
| HEX | #556366 |
| RGB | rgb(85, 99, 102) |
| HSL | hsl(191, 9%, 37%) |
| OKLCH | oklch(48.9% 0.018 212.1) |
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 #556366 | 6.24:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #556366 | 3.36:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #556366 text on white | 6.24:1 | AA | Lc 81.1 | Fine for body text |
| #556366 text on black | 3.36:1 | AA large text | Lc -20.7 | 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
#E8EAEB
oklch(93.6% 0.003 228.8)
-
Step 200
200
#D6DADB
oklch(88.6% 0.005 214.3)
-
Step 300
300
#BBC2C4
oklch(80.9% 0.008 216.6)
-
Step 400
400
#97A3A6
oklch(70.7% 0.014 214.4)
-
Step 500
500
#7E8D90
oklch(63.2% 0.018 211.1)
-
Step 600
600
#67777A
oklch(55.7% 0.02 210.2)
-
Step 700
700 (this color)
#556366
oklch(48.9% 0.018 212.1)
-
Step 800
800
#465154
oklch(42.6% 0.015 216)
-
Step 900
900
#3B4345
oklch(37.6% 0.011 214.4)
-
Step 950
950
#232728
oklch(26.9% 0.006 214.4)
#556366 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) | #606266 | 0.016 |
| Deuteranopia (no green cones) | #5D5F66 | 0.016 |
| Tritanopia (no blue cones) | #506464 | 0.009 |
| Achromatopsia (no color) | #606060 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556366
#556366
oklch(48.9% 0.018 212.1)
- #6A5D5A
#6A5D5A
oklch(49% 0.018 33.1)
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 #556366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.018
- Dim Gray #696969 ΔE 0.037
- Dusty Grape #545775 ΔE 0.051
- YInMn Blue #415A77 ΔE 0.053
- Dark Aqua #05696B ΔE 0.064
- Dark Green Blue #1F6357 ΔE 0.066
- Metallic Blue #4F738E ΔE 0.067
- Denim #3B638C ΔE 0.067
Use #556366 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.