#66737A
Closest named color: Battleship Gray (#6C757D). oklch(54.7% 0.019 231.2), rgb(102, 115, 122).
Aa
White text reads best on this color (4.88:1).
About this color
#66737A is a medium-dark close to neutral grey. In OKLCH its lightness is 55%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.012 away. White text reads best on it, at 4.88:1.
| Hue family | Neutrals |
| Lightness | medium-dark (55%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #66737A |
| RGB | rgb(102, 115, 122) |
| HSL | hsl(201, 9%, 44%) |
| OKLCH | oklch(54.7% 0.019 231.2) |
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 #66737A | 4.88:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #66737A | 4.29:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #66737A text on white | 4.88:1 | AA | Lc 73.9 | Content text, not long reading |
| #66737A text on black | 4.29:1 | AA large text | Lc -27.8 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E8EAEB
oklch(93.6% 0.003 228.8)
-
Step 200
200
#D6DADC
oklch(88.6% 0.005 228.8)
-
Step 300
300
#BBC2C5
oklch(80.9% 0.009 225.1)
-
Step 400
400
#98A2A8
oklch(70.6% 0.014 233.8)
-
Step 500
500
#7F8C92
oklch(63.2% 0.018 227.1)
-
Step 600
600 (this color)
#66737A
oklch(54.7% 0.019 231.2)
-
Step 700
700
#576369
oklch(49.2% 0.018 229.3)
-
Step 800
800
#475156
oklch(42.8% 0.015 229.3)
-
Step 900
900
#3C4347
oklch(37.8% 0.012 232.7)
-
Step 950
950
#232729
oklch(27% 0.007 229.1)
#66737A 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) | #70727A | 0.014 |
| Deuteranopia (no green cones) | #6D707A | 0.013 |
| Tritanopia (no blue cones) | #617575 | 0.013 |
| Achromatopsia (no color) | #717171 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66737A
#66737A
oklch(54.7% 0.019 231.2)
- #7A6E67
#7A6E67
oklch(54.7% 0.019 52.3)
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 #66737A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.012
- Battleship Grey #6B7C85 ΔE 0.029
- Dim Gray #696969 ΔE 0.032
- Grey Blue #647D8E ΔE 0.036
- Metallic Blue #4F738E ΔE 0.041
- Steel Grey #6F828A ΔE 0.047
- Slate Gray #708090 ΔE 0.047
- Medium Grey #7D7F7C ΔE 0.051
Use #66737A 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.