#666171
Closest named color: Dim Gray (#696969). oklch(50.3% 0.026 299.7), rgb(102, 97, 113).
Aa
White text reads best on this color (5.97:1).
About this color
#666171 is a medium-dark close to neutral grey. In OKLCH its lightness is 50%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.031 away. White text reads best on it, at 5.97:1.
| Hue family | Neutrals |
| Lightness | medium-dark (50%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.51:1 |
| White text | 5.97:1 |
Values
| HEX | #666171 |
| RGB | rgb(102, 97, 113) |
| HSL | hsl(259, 8%, 41%) |
| OKLCH | oklch(50.3% 0.026 299.7) |
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 #666171 | 5.97:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #666171 | 3.51:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #666171 text on white | 5.97:1 | AA | Lc 79.9 | Fine for body text |
| #666171 text on black | 3.51:1 | AA large text | Lc -21.9 | 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
#EAE9EC
oklch(93.6% 0.004 301.4)
-
Step 200
200
#DAD8DD
oklch(88.5% 0.007 304.2)
-
Step 300
300
#C1BFC8
oklch(80.9% 0.013 296.3)
-
Step 400
400
#A29EAC
oklch(70.7% 0.021 298.9)
-
Step 500
500
#8B8697
oklch(63% 0.026 299.1)
-
Step 600
600
#757082
oklch(55.6% 0.028 298.2)
-
Step 700
700 (this color)
#666171
oklch(50.3% 0.026 299.7)
-
Step 800
800
#504D59
oklch(42.8% 0.02 297)
-
Step 900
900
#434049
oklch(37.8% 0.016 300.8)
-
Step 950
950
#27252B
oklch(26.9% 0.011 300.8)
#666171 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) | #5E6372 | 0.013 |
| Deuteranopia (no green cones) | #5F6370 | 0.012 |
| Tritanopia (no blue cones) | #646366 | 0.021 |
| Achromatopsia (no color) | #636363 | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666171
#666171
oklch(50.3% 0.026 299.7)
- #626656
#626656
oklch(50.2% 0.025 118.7)
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 #666171, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.031
- Slate #516572 ΔE 0.031
- Dusty Grape #545775 ΔE 0.045
- Battleship Gray #6C757D ΔE 0.059
- Dull Purple #84597E ΔE 0.061
- Dusty Purple #825F87 ΔE 0.061
- YInMn Blue #415A77 ΔE 0.061
- Muted Purple #805B87 ΔE 0.062
Use #666171 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.