Complete web stats and search insights
Quite possibly the most powerful free analytics tool available, Google Analytics tracks pretty much every bit of traffic you can imagine on your website—where it comes from, which page is receiving it and so on.
While it’s not purely for SEO, it’s still a helpful tool to track if you’re getting traffic from organic search.
However, Google Analytics has since stopped showing which keywords send you that traffic. You’ll have to pair it with a tool like Keyword Hero to uncover what’s behind “(not provided).”