#66717C
Closest named color: Battleship Gray (#6C757D). oklch(54.3% 0.022 248.2), rgb(102, 113, 124).
Aa
White text reads best on this color (4.97:1).
About this color
#66717C is a medium-dark close to neutral grey. In OKLCH its lightness is 54%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.015 away. White text reads best on it, at 4.97:1.
| Hue family | Neutrals |
| Lightness | medium-dark (54%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.21:1 |
| White text | 4.97:1 |
Values
| HEX | #66717C |
| RGB | rgb(102, 113, 124) |
| HSL | hsl(210, 10%, 44%) |
| OKLCH | oklch(54.3% 0.022 248.2) |
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 #66717C | 4.97:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #66717C | 4.21:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #66717C text on white | 4.97:1 | AA | Lc 74.5 | Content text, not long reading |
| #66717C text on black | 4.21:1 | AA large text | Lc -27.2 | 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
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DD
oklch(88.4% 0.006 255.5)
-
Step 300
300
#BCC1C7
oklch(80.9% 0.01 252.8)
-
Step 400
400
#99A2AA
oklch(70.8% 0.016 244.8)
-
Step 500
500
#808B95
oklch(63.1% 0.02 245.5)
-
Step 600
600 (this color)
#66717C
oklch(54.3% 0.022 248.2)
-
Step 700
700
#58626C
oklch(49.1% 0.02 248.2)
-
Step 800
800
#485058
oklch(42.7% 0.017 248.2)
-
Step 900
900
#3C4248
oklch(37.6% 0.013 248.2)
-
Step 950
950
#23272A
oklch(27% 0.008 240.2)
#66717C 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) | #6D717D | 0.010 |
| Deuteranopia (no green cones) | #6A6F7C | 0.008 |
| Tritanopia (no blue cones) | #607374 | 0.018 |
| Achromatopsia (no color) | #707070 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66717C
#66717C
oklch(54.3% 0.022 248.2)
- #786E62
#786E62
oklch(54.4% 0.022 72.4)
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 #66717C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.015
- Dim Gray #696969 ΔE 0.031
- Battleship Grey #6B7C85 ΔE 0.033
- Grey Blue #647D8E ΔE 0.038
- Metallic Blue #4F738E ΔE 0.038
- Slate #516572 ΔE 0.049
- Slate Gray #708090 ΔE 0.050
- Steel Grey #6F828A ΔE 0.052
Use #66717C 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.