#666571
Closest named color: Dim Gray (#696969). oklch(51.2% 0.019 289.5), rgb(102, 101, 113).
Aa
White text reads best on this color (5.73:1).
About this color
#666571 is a medium-dark close to neutral grey. In OKLCH its lightness is 51%, 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 5.73:1.
| Hue family | Neutrals |
| Lightness | medium-dark (51%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #666571 |
| RGB | rgb(102, 101, 113) |
| HSL | hsl(245, 6%, 42%) |
| OKLCH | oklch(51.2% 0.019 289.5) |
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 #666571 | 5.73:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #666571 | 3.66:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #666571 text on white | 5.73:1 | AA | Lc 78.7 | Fine for body text |
| #666571 text on black | 3.66:1 | AA large text | Lc -23.1 | 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
#EAE9EB
oklch(93.5% 0.003 308.4)
-
Step 200
200
#D9D8DC
oklch(88.4% 0.006 297.7)
-
Step 300
300
#C0C0C6
oklch(81% 0.008 286.2)
-
Step 400
400
#A09FA9
oklch(70.6% 0.014 290.6)
-
Step 500
500
#898894
oklch(63.2% 0.018 289.7)
-
Step 600
600
#73727F
oklch(55.7% 0.02 289.3)
-
Step 700
700 (this color)
#666571
oklch(51.2% 0.019 289.5)
-
Step 800
800
#4E4E57
oklch(42.7% 0.015 285.8)
-
Step 900
900
#414148
oklch(37.8% 0.012 285.8)
-
Step 950
950
#26262A
oklch(27% 0.007 285.9)
#666571 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) | #626672 | 0.006 |
| Deuteranopia (no green cones) | #626671 | 0.006 |
| Tritanopia (no blue cones) | #646769 | 0.016 |
| Achromatopsia (no color) | #666666 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666571
#666571
oklch(51.2% 0.019 289.5)
- #67685B
#67685B
oklch(51.2% 0.02 110.7)
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 #666571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.021
- Slate #516572 ΔE 0.030
- Battleship Gray #6C757D ΔE 0.048
- Dusty Grape #545775 ΔE 0.055
- Metallic Blue #4F738E ΔE 0.056
- Dusty Purple #825F87 ΔE 0.064
- Grey Purple #826D8C ΔE 0.065
- Dull Purple #84597E ΔE 0.066
Use #666571 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.