Free competitor analysis tool

Finding the best free tool depends on whether you want to track traffic, ads, or keywords. For general traffic stats, SimilarWeb is the gold standard; its browser extension provides a quick snapshot of estimated monthly visits, bounce rates, and top traffic sources for almost any site.

For SEO and keyword research, SEMrush offers a free tier (limited to 10 searches per day) that is excellent for identifying which specific terms are driving organic growth for your rivals. If you are focused on marketing tactics, the Meta Ad Library is a completely free, essential resource that lets you see every active ad a competitor is running across Facebook and Instagram.

To understand their technical setup—such as which email provider or tracking pixels they use—BuiltWith is indispensable. Finally, for automated monitoring, Google Alerts remains the simplest way to get notified whenever a competitor is mentioned in the news.

Most "free" versions of professional tools have daily limits, so I recommend using SimilarWeb for high-level research and the Meta Ad Library for creative inspiration, as neither requires a paid subscription to see actionable data.

Are you primarily looking to see their traffic and SEO keywords, or are you more interested in their creative advertising and social media strategy?