Web analytics tools for acquisition and attribution
While acquisition is your focus, you’ll want to start by identifying trends and patterns of user behavior. Answer things like: Which traffic sources are valuable for your business? What content on your site drives them to convert?
Once you have a handle on that and start experimenting with multiple acquisition channels Attribution becomes important.
Basic Acquisition Analytics
If you're just getting started with user acquisition the focus of your analytics tools should be on analyzing traffic sources and conversions. We have an article about Basic Web Analytics tools that should get you started. Those tools are sufficient for direct attribution of conversions to their traffic sources.
First- and Last-Touch Attribution
If you’re looking for some basic marketing attribution capabilities, Google Analytics and KISSmetrics have first-touch and last-touch options to analyze when customers visited your site from multiple marketing campaigns. They also offer anonymous user tracking along with Amplitude.