#646F66
Closest named color: Dim Gray (#696969). oklch(53% 0.019 150.8), rgb(100, 111, 102).
Aa
White text reads best on this color (5.24:1).
About this color
#646F66 is a medium-dark close to neutral grey. In OKLCH its lightness is 53%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.021 away. White text reads best on it, at 5.24:1.
| Hue family | Neutrals |
| Lightness | medium-dark (53%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #646F66 |
| RGB | rgb(100, 111, 102) |
| HSL | hsl(131, 5%, 41%) |
| OKLCH | oklch(53% 0.019 150.8) |
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 #646F66 | 5.24:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #646F66 | 4.00:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #646F66 text on white | 5.24:1 | AA | Lc 76.0 | Fine for body text |
| #646F66 text on black | 4.00:1 | AA large text | Lc -25.7 | 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 600.
-
Step 50
50
#F5F6F5
oklch(97.2% 0.002 145.6)
-
Step 100
100
#E9EAE9
oklch(93.6% 0.002 145.6)
-
Step 200
200
#D7DAD7
oklch(88.5% 0.005 145.5)
-
Step 300
300
#BDC2BE
oklch(80.9% 0.008 151.9)
-
Step 400
400
#9BA39C
oklch(70.7% 0.014 149.2)
-
Step 500
500
#828D84
oklch(63.2% 0.018 150.9)
-
Step 600
600 (this color)
#646F66
oklch(53% 0.019 150.8)
-
Step 700
700
#5A645C
oklch(49.2% 0.018 151.5)
-
Step 800
800
#49514B
oklch(42.6% 0.014 153.3)
-
Step 900
900
#3D433E
oklch(37.6% 0.012 150.4)
-
Step 950
950
#242725
oklch(26.9% 0.006 156.8)
#646F66 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) | #6F6D66 | 0.017 |
| Deuteranopia (no green cones) | #6D6C66 | 0.015 |
| Tritanopia (no blue cones) | #636F6C | 0.009 |
| Achromatopsia (no color) | #6C6C6C | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646F66
#646F66
oklch(53% 0.019 150.8)
- #736871
#736871
oklch(53.1% 0.019 331.9)
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 #646F66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.021
- Battleship Gray #6C757D ΔE 0.038
- Grey Brown #7F7053 ΔE 0.048
- Dark Taupe #7F684E ΔE 0.049
- Slate #516572 ΔE 0.050
- Battleship Grey #6B7C85 ΔE 0.054
- Dull Brown #876E4B ΔE 0.062
- Metallic Blue #4F738E ΔE 0.063
Use #646F66 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.