#64728C
Closest named color: Metallic Blue (#4F738E). oklch(55% 0.044 262.7), rgb(100, 114, 140).
Aa
White text reads best on this color (4.85:1).
About this color
#64728C is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.044 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.026 away. White text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.32:1 |
| White text | 4.85:1 |
Values
| HEX | #64728C |
| RGB | rgb(100, 114, 140) |
| HSL | hsl(219, 17%, 47%) |
| OKLCH | oklch(55% 0.044 262.7) |
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 #64728C | 4.85:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #64728C | 4.32:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #64728C text on white | 4.85:1 | AA | Lc 73.6 | Content text, not long reading |
| #64728C text on black | 4.32:1 | AA large text | Lc -28.0 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D5D9E1
oklch(88.5% 0.012 264.5)
-
Step 300
300
#BAC1CE
oklch(80.9% 0.02 263)
-
Step 400
400
#96A1B5
oklch(70.7% 0.032 262.5)
-
Step 500
500
#7D8AA3
oklch(63.2% 0.041 263.5)
-
Step 600
600 (this color)
#64728C
oklch(55% 0.044 262.7)
-
Step 700
700
#546178
oklch(49.1% 0.04 261.8)
-
Step 800
800
#454F62
oklch(42.6% 0.034 263.2)
-
Step 900
900
#3A4250
oklch(37.7% 0.026 261.6)
-
Step 950
950
#22272F
oklch(27.1% 0.017 259.8)
#64728C 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) | #6A738D | 0.009 |
| Deuteranopia (no green cones) | #66708B | 0.006 |
| Tritanopia (no blue cones) | #59777B | 0.038 |
| Achromatopsia (no color) | #717171 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #64728C
#64728C
oklch(55% 0.044 262.7)
- #7E7054
#7E7054
oklch(55.1% 0.044 84.4)
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 #64728C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.026
- Battleship Gray #6C757D ΔE 0.030
- Grey Blue #647D8E ΔE 0.032
- Stormy Blue #507B9C ΔE 0.036
- Battleship Grey #6B7C85 ΔE 0.037
- Dull Blue #49759C ΔE 0.038
- Cerulean #457B9D ΔE 0.043
- Slate Gray #708090 ΔE 0.045
Use #64728C 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.