Sure, there are many expensive tools out there to track the competition of your website. But maybe you just want a quick idea of the amount of traffic competing sites get and don't care too much about the details yet. That was me, so I built a Google Sheets dashboard that scrapes Alexa rankings.
A widespread fallacy among IT professionals is that DNS propagates through some network. So widespread in fact, that there are a couple of sites dedicated to visualizing the geographic propagation of DNS records. But DNS propagation does not exist.