How to Check Website Traffic
Short answer
If it's your own site, Google Analytics (GA4) gives you exact, real numbers for free. If it's someone else's site, no free tool gives you their exact traffic. Tools like Similarweb, Semrush's free traffic checker, and Ahrefs' free traffic checker give reasonable estimates based on modeled data, not the site's actual analytics.
This question splits into two very different answers depending on whether you own the site in question. Checking your own traffic is a solved problem: install Google Analytics, and you get exact numbers. Checking a competitor's or any other third party's traffic is fundamentally an estimate, because their real analytics data is private to them.
If it is your own site
Google Analytics 4 (GA4) is the standard, free choice, and it gives you exact sessions, users, and event counts for your own property once it's correctly installed. Google Search Console is a separate, equally useful tool that shows something GA4 doesn't: how many clicks and impressions your site gets specifically from Google Search results, along with the actual search queries people used. The two tools measure different things and regularly show different numbers for the same period. That's expected, not a bug: Search Console counts search-result clicks, GA4 counts all sessions from every source.
If it is someone else's site
Similarweb, Semrush's traffic checker, and Ahrefs' traffic checker are the most commonly used free tools for this. All three model traffic using a mix of clickstream panels, DNS data, and their own crawl and data, then estimate a monthly visit count. Treat any number from these tools as a rough order of magnitude, not a precise figure, and treat the trend line (is traffic growing or shrinking) as more reliable than any single month's absolute number.
What the numbers actually mean
A 'session' is one continuous period of activity from one visitor, and a single visitor can have several sessions in a day if they leave and come back after a gap. 'Users' counts distinct people (or, more precisely, distinct browser identifiers) in a given period. Pageviews count individual page loads, and one session usually includes several. When comparing tools or time periods, make sure you're comparing the same metric; a jump in 'pageviews' without a matching jump in 'sessions' just means people are browsing more pages per visit, not that more people showed up.
The practical checklist
Confirm GA4 is actually installed and firing
Check the Realtime report while you browse your own site. If it stays at zero, the tag isn't firing, regardless of what the code looks like.
Add Search Console for search-specific numbers
It shows clicks, impressions, and the actual queries driving traffic, none of which GA4 reports on its own.
Use a third-party estimator only for competitors
Similarweb, Semrush, or Ahrefs, and only for rough comparison or trend direction, not exact numbers.
Match metrics before comparing tools or periods
Sessions, users, and pageviews are all different things. A month-over-month comparison only means something if you're tracking the same one.
Key takeaways
- • For your own site, Google Analytics 4 gives exact traffic numbers for free.
- • Google Search Console and GA4 measure different things and will show different numbers for the same period; that is expected.
- • For someone else's site, every free tool gives an estimate based on modeled data, not their real analytics.
- • Treat third-party traffic estimates as directional (growing vs shrinking), not precise.
- • Sessions, users, and pageviews are different metrics; comparisons only make sense when you keep the metric consistent.
Frequently asked questions
Can I see another website's exact traffic for free?+
No. Exact traffic data lives in that site's own analytics, which is private. Free tools like Similarweb or Semrush only provide modeled estimates.
What's the difference between Google Analytics and Search Console traffic numbers?+
Search Console only counts clicks and impressions from Google Search results. GA4 counts sessions from every source, including direct visits, social, email, and search. They're measuring different things by design.
How accurate are third-party traffic estimator tools?+
They're reasonable for spotting overall scale and trend direction, but individual monthly numbers can be off by a wide margin, especially for smaller sites with less data for the models to work from.
Why does GA4 show 0 traffic even though I installed it?+
The most common cause is a tag pointing at the wrong measurement ID, for example a snippet copied from a different property or an old project. Check the Realtime report while browsing the site yourself; if it stays at zero, the tag isn't reporting to the property you're looking at.
What counts as a "session" in website analytics?+
A session is one continuous period of activity by a single visitor. By default it ends after 30 minutes of inactivity, so the same person can generate multiple sessions in one day if they leave and come back later.