#647B7C
Closest named color: Battleship Grey (#6B7C85). oklch(56.5% 0.027 199.7), rgb(100, 123, 124).
Aa
Black text reads best on this color (4.66:1).
About this color
#647B7C 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 Grey (#6B7C85), ΔE 0.018 away. Black text reads best on it, at 4.66:1.
| Hue family | Neutrals |
| Lightness | medium-dark (56%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Battleship Grey (#6B7C85) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #647B7C |
| RGB | rgb(100, 123, 124) |
| HSL | hsl(183, 11%, 44%) |
| OKLCH | oklch(56.5% 0.027 199.7) |
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 #647B7C | 4.50:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #647B7C | 4.66:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #647B7C text on white | 4.50:1 | AA | Lc 71.2 | Content text, not long reading |
| #647B7C text on black | 4.66:1 | AA | Lc -30.4 | Non-text elements, placeholder text |
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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEB
oklch(93.5% 0.004 219.5)
-
Step 200
200
#D4DADB
oklch(88.4% 0.007 208.8)
-
Step 300
300
#B8C3C3
oklch(80.9% 0.012 196.9)
-
Step 400
400
#93A4A5
oklch(70.6% 0.019 201)
-
Step 500
500
#798E8F
oklch(63.1% 0.024 200.1)
-
Step 600
600 (this color)
#647B7C
oklch(56.5% 0.027 199.7)
-
Step 700
700
#516566
oklch(49.1% 0.024 200.2)
-
Step 800
800
#425353
oklch(42.8% 0.021 196.4)
-
Step 900
900
#384445
oklch(37.6% 0.016 202.7)
-
Step 950
950
#212828
oklch(27% 0.01 196.6)
#647B7C 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) | #78797C | 0.028 |
| Deuteranopia (no green cones) | #73757C | 0.026 |
| Tritanopia (no blue cones) | #5D7D7B | 0.011 |
| Achromatopsia (no color) | #777777 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647B7C
#647B7C
oklch(56.5% 0.027 199.7)
- #85706F
#85706F
oklch(56.5% 0.027 21.2)
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 #647B7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Grey #6B7C85 ΔE 0.018
- Battleship Gray #6C757D ΔE 0.021
- Grey Blue #647D8E ΔE 0.027
- Steel Grey #6F828A ΔE 0.031
- Slate Gray #708090 ΔE 0.037
- Medium Grey #7D7F7C ΔE 0.038
- Gray #808080 ΔE 0.044
- Steel #738595 ΔE 0.049
Use #647B7C 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.