#647A75
Closest named color: Battleship Gray (#6C757D). oklch(56% 0.027 179.9), rgb(100, 122, 117).
Aa
White text reads best on this color (4.58:1).
About this color
#647A75 is a medium-dark close to neutral grey. In OKLCH its lightness is 56%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.025 away. White text reads best on it, at 4.58:1.
| Hue family | Neutrals |
| Lightness | medium-dark (56%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.58:1 |
| White text | 4.58:1 |
Values
| HEX | #647A75 |
| RGB | rgb(100, 122, 117) |
| HSL | hsl(166, 10%, 44%) |
| OKLCH | oklch(56% 0.027 179.9) |
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 #647A75 | 4.58:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #647A75 | 4.58:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #647A75 text on white | 4.58:1 | AA | Lc 71.8 | Content text, not long reading |
| #647A75 text on black | 4.58:1 | AA | Lc -29.8 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E7EBEA
oklch(93.7% 0.004 179.7)
-
Step 200
200
#D5DBD9
oklch(88.6% 0.007 174.4)
-
Step 300
300
#B9C3C1
oklch(80.9% 0.011 182.8)
-
Step 400
400
#94A5A1
oklch(70.7% 0.02 180)
-
Step 500
500
#7A8F8A
oklch(63.2% 0.025 179.5)
-
Step 600
600 (this color)
#647A75
oklch(56% 0.027 179.9)
-
Step 700
700
#526661
oklch(49.2% 0.025 178.3)
-
Step 800
800
#43534F
oklch(42.7% 0.021 178.4)
-
Step 900
900
#394542
oklch(37.9% 0.016 178.6)
-
Step 950
950
#212827
oklch(27% 0.01 186.1)
#647A75 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) | #787775 | 0.029 |
| Deuteranopia (no green cones) | #747475 | 0.027 |
| Tritanopia (no blue cones) | #5F7B78 | 0.007 |
| Achromatopsia (no color) | #757575 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647A75
#647A75
oklch(56% 0.027 179.9)
- #836E74
#836E74
oklch(56% 0.028 358.9)
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 #647A75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.025
- Battleship Grey #6B7C85 ΔE 0.027
- Grey Blue #647D8E ΔE 0.037
- Steel Grey #6F828A ΔE 0.039
- Medium Grey #7D7F7C ΔE 0.041
- Slate Gray #708090 ΔE 0.046
- Dim Gray #696969 ΔE 0.048
- Gray #808080 ΔE 0.048
Use #647A75 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.