What a traffic tool really measures (and what it doesn’t)
Before choosing a free or paid plan, it’s worth understanding what data you’re buying. When you check the traffic of someone else’s site, most tools estimate sessions based on user panels, extensions, ISP data, or statistical models. They don’t see your neighbor’s server log. That means a site with fewer than 300-500 monthly visits usually shows up as “no data” or with unreliable figures, even in expensive tools. If your case is comparing small competitors, no subscription is going to solve that data gap.
Another key distinction: measuring your own site (your own analytics, with consent and cookies or cookieless measurement) is not the same as spying on third-party traffic. The former gives exact data on users, sessions, and conversions. The latter gives directional approximations useful for benchmarking, not for making business decisions down to the penny.
What each option gives you for free without paying
Google Analytics 4 and Search Console (your website only)
For your own domain, GA4 and Search Console are free and are the reference. Search Console shows real impressions and clicks from Google; GA4 adds behavior. However, GA4 has a practical limit that many discover late: by default, the interface only guarantees retention of user and event data for 2 months, and extending it to 14 months is free but you have to enable it in the settings. If you don’t, you lose historical data without warning.
Freemium tools for third-party traffic
Options like Similarweb, Semrush, or Ahrefs offer limited versions or trials. In practice, Similarweb’s free plan gives an estimate of monthly visits and little more; Semrush and Ahrefs trials last a few days and limit queries. They’re good for a one-off snapshot, not for monitoring 30 domains over months. A common mistake: using a competitor’s free visit data as if it were exact and drawing market-share conclusions from it. The margin of error can be wide, especially on sites with highly seasonal traffic or a lot of app traffic.
When the paid plan is truly justified
Paid plans add value when you need long historical series, data export, comparison of multiple domains, and breakdown by channel or country. For an agency doing monthly competitor audits, the subscription pays for itself because it saves hours of manual work. For a personal blog that wants to know how much traffic its rival has, it doesn’t.
There’s a nuance you only see with use: paid tools also fail in specific niches. Sites with a lot of traffic from mobile apps, content inside closed platforms, or small local markets tend to be underrepresented in estimation panels. I’ve seen domains with thousands of active followers show very low visit figures because their audience consumes the content inside an app rather than in the browser. No premium plan fixes that.
How to set up a useful comparison without spending
A reasonable routine: use Search Console for your own domain (real data), supplement with a freemium tool for a rough estimate of competitors, and validate with indirect signals such as number of reviews, social activity, or indexed subdomains. If the budget is tight, prioritize your own analytics over third-party analytics: exact data from your website is worth more than someone else’s estimates.
According to official documentation from the main analytics platforms, third-party traffic data are estimates, and this is stated in their own methodological notes. Treating them as absolute truth is the most costly mistake, whether the plan is free or paid.