#666F80
Closest named color: Battleship Gray (#6C757D). oklch(54% 0.029 263.2), rgb(102, 111, 128).
Aa
White text reads best on this color (5.05:1).
About this color
#666F80 is a medium-dark close to neutral grey. In OKLCH its lightness is 54%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.022 away. White text reads best on it, at 5.05:1.
| Hue family | Neutrals |
| Lightness | medium-dark (54%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #666F80 |
| RGB | rgb(102, 111, 128) |
| HSL | hsl(219, 11%, 45%) |
| OKLCH | oklch(54% 0.029 263.2) |
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 #666F80 | 5.05:1 | AA | Lc -80.3 | Fine for body text |
| Black text on #666F80 | 4.15:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #666F80 text on white | 5.05:1 | AA | Lc 75.0 | Content text, not long reading |
| #666F80 text on black | 4.15:1 | AA large text | Lc -26.8 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D7D9DE
oklch(88.5% 0.007 268.5)
-
Step 300
300
#BCC1C9
oklch(80.9% 0.013 259.8)
-
Step 400
400
#9AA1AE
oklch(70.8% 0.021 263)
-
Step 500
500
#818A9A
oklch(63.1% 0.026 262)
-
Step 600
600 (this color)
#666F80
oklch(54% 0.029 263.2)
-
Step 700
700
#596170
oklch(49.1% 0.026 263.1)
-
Step 800
800
#494F5C
oklch(42.7% 0.023 265.8)
-
Step 900
900
#3D424B
oklch(37.8% 0.017 262.3)
-
Step 950
950
#24262C
oklch(26.9% 0.012 271)
#666F80 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) | #6A7081 | 0.007 |
| Deuteranopia (no green cones) | #676D80 | 0.006 |
| Tritanopia (no blue cones) | #607274 | 0.025 |
| Achromatopsia (no color) | #6F6F6F | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666F80
#666F80
oklch(54% 0.029 263.2)
- #776E5C
#776E5C
oklch(54.1% 0.029 84.5)
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 #666F80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.022
- Metallic Blue #4F738E ΔE 0.034
- Dim Gray #696969 ΔE 0.035
- Battleship Grey #6B7C85 ΔE 0.039
- Grey Blue #647D8E ΔE 0.040
- Slate #516572 ΔE 0.047
- Grey Purple #826D8C ΔE 0.049
- Purple Grey #866F85 ΔE 0.051
Use #666F80 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.