#55666A
Closest named color: Slate (#516572). oklch(49.8% 0.022 213.5), rgb(85, 102, 106).
Aa
White text reads best on this color (6.00:1).
About this color
#55666A is a medium-dark close to neutral grey. In OKLCH its lightness is 50%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.015 away. White text reads best on it, at 6.00:1.
| Hue family | Neutrals |
| Lightness | medium-dark (50%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.49:1 |
| White text | 6.00:1 |
Values
| HEX | #55666A |
| RGB | rgb(85, 102, 106) |
| HSL | hsl(191, 11%, 37%) |
| OKLCH | oklch(49.8% 0.022 213.5) |
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 #55666A | 6.00:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #55666A | 3.49:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #55666A text on white | 6.00:1 | AA | Lc 80.0 | Fine for body text |
| #55666A text on black | 3.49:1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E8EAEB
oklch(93.6% 0.003 228.8)
-
Step 200
200
#D5DADB
oklch(88.5% 0.006 211)
-
Step 300
300
#B9C2C5
oklch(80.8% 0.011 219.6)
-
Step 400
400
#95A3A7
oklch(70.6% 0.017 216.7)
-
Step 500
500
#7B8D91
oklch(63% 0.022 212.6)
-
Step 600
600
#64777C
oklch(55.6% 0.024 215.4)
-
Step 700
700 (this color)
#55666A
oklch(49.8% 0.022 213.5)
-
Step 800
800
#445255
oklch(42.8% 0.018 212.1)
-
Step 900
900
#394446
oklch(37.8% 0.015 209.8)
-
Step 950
950
#222829
oklch(27.1% 0.009 208.7)
#55666A 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) | #63656A | 0.020 |
| Deuteranopia (no green cones) | #5F626A | 0.018 |
| Tritanopia (no blue cones) | #4F6867 | 0.012 |
| Achromatopsia (no color) | #636363 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55666A
#55666A
oklch(49.8% 0.022 213.5)
- #6E5E5B
#6E5E5B
oklch(49.7% 0.021 30.4)
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 #55666A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.015
- Dim Gray #696969 ΔE 0.032
- Dusty Grape #545775 ΔE 0.055
- YInMn Blue #415A77 ΔE 0.056
- Metallic Blue #4F738E ΔE 0.059
- Battleship Gray #6C757D ΔE 0.061
- Dark Aqua #05696B ΔE 0.064
- Denim #3B638C ΔE 0.065
Use #55666A 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.