#666371
Closest named color: Dim Gray (#696969). oklch(50.7% 0.022 295.4), rgb(102, 99, 113).
Aa
White text reads best on this color (5.85:1).
About this color
#666371 is a medium-dark close to neutral grey. In OKLCH its lightness is 51%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.026 away. White text reads best on it, at 5.85:1.
| Hue family | Neutrals |
| Lightness | medium-dark (51%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #666371 |
| RGB | rgb(102, 99, 113) |
| HSL | hsl(253, 7%, 42%) |
| OKLCH | oklch(50.7% 0.022 295.4) |
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 #666371 | 5.85:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #666371 | 3.58:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #666371 text on white | 5.85:1 | AA | Lc 79.3 | Fine for body text |
| #666371 text on black | 3.58:1 | AA large text | Lc -22.5 | 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
#D9D8DD
oklch(88.4% 0.007 295.4)
-
Step 300
300
#C1BFC7
oklch(80.9% 0.011 297.6)
-
Step 400
400
#A19FAA
oklch(70.8% 0.016 294.3)
-
Step 500
500
#8A8796
oklch(63.1% 0.022 294.9)
-
Step 600
600
#747180
oklch(55.6% 0.023 294.8)
-
Step 700
700 (this color)
#666371
oklch(50.7% 0.022 295.4)
-
Step 800
800
#4F4D58
oklch(42.6% 0.018 294)
-
Step 900
900
#424049
oklch(37.7% 0.015 295.8)
-
Step 950
950
#27262A
oklch(27.1% 0.007 297.3)
#666371 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) | #606572 | 0.010 |
| Deuteranopia (no green cones) | #616571 | 0.009 |
| Tritanopia (no blue cones) | #646568 | 0.018 |
| Achromatopsia (no color) | #656565 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666371
#666371
oklch(50.7% 0.022 295.4)
- #656759
#656759
oklch(50.8% 0.022 113.8)
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 #666371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.026
- Slate #516572 ΔE 0.030
- Dusty Grape #545775 ΔE 0.050
- Battleship Gray #6C757D ΔE 0.053
- Metallic Blue #4F738E ΔE 0.059
- Dusty Purple #825F87 ΔE 0.062
- Dull Purple #84597E ΔE 0.063
- Muted Purple #805B87 ΔE 0.064
Use #666371 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.