Google Analytics is a free traffic checker. It shows where your website visitors are coming from, what they do, and how long they stay.
Alexa Rank measures website popularity. It rates millions of websites, with 1 being the most popular. Alexa's Traffic Rank is calculated using global online traffic data.
SEMrush is a popular traffic checker. Some of the largest brands in industry use this application to track website traffic and performance. SEMrush is a simple but powerful tool.
SimilarWeb lets users see a website's projected monthly visitors. SimilarWeb rankings by category and nation. SimilarWeb lets users compare website traffic.
BuiltWith's Trends tool is useful. This tool shows how web technologies have evolved. The Trends tool shows how quickly websites embraced responsive design in recent years.