#646F7F
Closest named color: Battleship Gray (#6C757D). oklch(53.8% 0.028 257.7), rgb(100, 111, 127).
Aa
White text reads best on this color (5.09:1).
About this color
#646F7F is a medium-dark close to neutral grey. In OKLCH its lightness is 54%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Battleship Gray (#6C757D), ΔE 0.023 away. White text reads best on it, at 5.09:1.
| Hue family | Neutrals |
| Lightness | medium-dark (54%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.12:1 |
| White text | 5.09:1 |
Values
| HEX | #646F7F |
| RGB | rgb(100, 111, 127) |
| HSL | hsl(216, 12%, 45%) |
| OKLCH | oklch(53.8% 0.028 257.7) |
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 #646F7F | 5.09:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #646F7F | 4.12:1 | AA large text | Lc 28.9 | Dividers and decoration only |
| #646F7F text on white | 5.09:1 | AA | Lc 75.2 | Fine for body text |
| #646F7F text on black | 4.12:1 | AA large text | Lc -26.6 | 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
#D6D9DE
oklch(88.4% 0.008 260.7)
-
Step 300
300
#BBC1C9
oklch(80.9% 0.013 255.5)
-
Step 400
400
#99A1AE
oklch(70.7% 0.021 260.2)
-
Step 500
500
#808A9A
oklch(63.1% 0.027 259.8)
-
Step 600
600 (this color)
#646F7F
oklch(53.8% 0.028 257.7)
-
Step 700
700
#576170
oklch(49% 0.027 258.4)
-
Step 800
800
#48505B
oklch(42.8% 0.021 256.4)
-
Step 900
900
#3C424B
oklch(37.7% 0.017 258.4)
-
Step 950
950
#23272C
oklch(27.1% 0.011 254)
#646F7F 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) | #6A7080 | 0.010 |
| Deuteranopia (no green cones) | #676D7F | 0.007 |
| Tritanopia (no blue cones) | #5D7274 | 0.025 |
| Achromatopsia (no color) | #6E6E6E | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646F7F
#646F7F
oklch(53.8% 0.028 257.7)
- #786C5C
#786C5C
oklch(53.8% 0.028 75)
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 #646F7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.023
- Metallic Blue #4F738E ΔE 0.033
- Dim Gray #696969 ΔE 0.033
- Battleship Grey #6B7C85 ΔE 0.040
- Grey Blue #647D8E ΔE 0.041
- Slate #516572 ΔE 0.044
- Stormy Blue #507B9C ΔE 0.051
- Dull Blue #49759C ΔE 0.051
Use #646F7F 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.