Apart from monitoring website performance in real time, you can also assess how many people have visited your website during a particular time using Site24x7 Real User Monitoring.
The RUM dashboard shows you the number of unique visitors, as illustrated in the figure below.
In the image above, we can see that nearly 9,000 people visited this website in the past month, contributing to about 100,000 pageviews.
Note: Unique visits are browser-specific. You can read more about pageviews and unique visits here.