Ubersuggest works with estimates based on the rankings it identifies for each page and country on Google. However, these results won’t always reflect the exact numbers.
For example, Neil’s site gets over 5 million visitors per month, but the tool only shows you a part of that traffic.
This isn’t only with Ubersuggest. Most SEO tools work with several different data sources and calculate their metrics using different algorithms to get the best data possible.
Still, because no one has access to the website’s back-end and analytics, no tool can be 100% accurate.
For more information on Ubersuggest data, please check: Where do we get data from?