#646F78
Closest named color: Battleship Gray (#6C757D). oklch(53.6% 0.019 242.7), rgb(100, 111, 120).
Aa
White text reads best on this color (5.13:1).
About this color
#646F78 is a medium-dark close to neutral grey. In OKLCH its lightness is 54%, its chroma 0.019. 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 5.13:1.
| Hue family | Neutrals |
| Lightness | medium-dark (54%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.08:1 |
| White text | 5.13:1 |
Values
| HEX | #646F78 |
| RGB | rgb(100, 111, 120) |
| HSL | hsl(207, 9%, 43%) |
| OKLCH | oklch(53.6% 0.019 242.7) |
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 #646F78 | 5.13:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #646F78 | 4.08:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #646F78 text on white | 5.13:1 | AA | Lc 75.4 | Fine for body text |
| #646F78 text on black | 4.08:1 | AA large text | Lc -26.3 | 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
#D6D9DC
oklch(88.4% 0.005 247.9)
-
Step 300
300
#BCC1C6
oklch(80.8% 0.009 247.9)
-
Step 400
400
#99A2A9
oklch(70.7% 0.014 241)
-
Step 500
500
#808B94
oklch(63.1% 0.019 242.6)
-
Step 600
600 (this color)
#646F78
oklch(53.6% 0.019 242.7)
-
Step 700
700
#58626A
oklch(49% 0.018 242.1)
-
Step 800
800
#485057
oklch(42.7% 0.016 244.5)
-
Step 900
900
#3C4247
oklch(37.5% 0.012 243.1)
-
Step 950
950
#23272A
oklch(27% 0.008 240.2)
#646F78 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) | #6B6F78 | 0.010 |
| Deuteranopia (no green cones) | #696D78 | 0.009 |
| Tritanopia (no blue cones) | #5F7172 | 0.015 |
| Achromatopsia (no color) | #6D6D6D | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646F78
#646F78
oklch(53.6% 0.019 242.7)
- #766B62
#766B62
oklch(53.5% 0.02 61.7)
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 #646F78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.022
- Dim Gray #696969 ΔE 0.024
- Metallic Blue #4F738E ΔE 0.040
- Battleship Grey #6B7C85 ΔE 0.041
- Slate #516572 ΔE 0.042
- Grey Blue #647D8E ΔE 0.045
- Purple Grey #866F85 ΔE 0.058
- Slate Gray #708090 ΔE 0.058
Use #646F78 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.