#5B666D
Closest named color: Slate (#516572). oklch(50.3% 0.018 235.7), rgb(91, 102, 109).
Aa
White text reads best on this color (5.88:1).
About this color
#5B666D is a medium-dark close to neutral grey. In OKLCH its lightness is 50%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.016 away. White text reads best on it, at 5.88:1.
| Hue family | Neutrals |
| Lightness | medium-dark (50%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.56:1 |
| White text | 5.88:1 |
Values
| HEX | #5B666D |
| RGB | rgb(91, 102, 109) |
| HSL | hsl(203, 9%, 39%) |
| OKLCH | oklch(50.3% 0.018 235.7) |
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 #5B666D | 5.88:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #5B666D | 3.56:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #5B666D text on white | 5.88:1 | AA | Lc 79.5 | Fine for body text |
| #5B666D text on black | 3.56:1 | AA large text | Lc -22.3 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E8EAEB
oklch(93.6% 0.003 228.8)
-
Step 200
200
#D6DADC
oklch(88.6% 0.005 228.8)
-
Step 300
300
#BCC2C5
oklch(81% 0.008 228.9)
-
Step 400
400
#99A2A8
oklch(70.7% 0.014 236.7)
-
Step 500
500
#808B93
oklch(63% 0.018 239.3)
-
Step 600
600
#69757D
oklch(55.5% 0.019 237)
-
Step 700
700 (this color)
#5B666D
oklch(50.3% 0.018 235.7)
-
Step 800
800
#485056
oklch(42.6% 0.014 240.2)
-
Step 900
900
#3C4347
oklch(37.8% 0.012 232.7)
-
Step 950
950
#232729
oklch(27% 0.007 229.1)
#5B666D 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) | #63666D | 0.012 |
| Deuteranopia (no green cones) | #60636D | 0.011 |
| Tritanopia (no blue cones) | #566868 | 0.014 |
| Achromatopsia (no color) | #646464 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B666D
#5B666D
oklch(50.3% 0.018 235.7)
- #6C625B
#6C625B
oklch(50.3% 0.017 57.3)
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 #5B666D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.016
- Dim Gray #696969 ΔE 0.025
- Dusty Grape #545775 ΔE 0.053
- Battleship Gray #6C757D ΔE 0.054
- Metallic Blue #4F738E ΔE 0.055
- YInMn Blue #415A77 ΔE 0.059
- Denim #3B638C ΔE 0.065
- Dark Taupe #7F684E ΔE 0.072
Use #5B666D 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.