SimilarWeb

What is SimilarWeb?

SimilarWeb is a digital intelligence platform that estimates the traffic, audience behaviour, and competitive positioning of any website on the internet. Type in a domain and you'll see an estimated monthly visit count, traffic source breakdown (organic, paid, social, referral, direct), top referring sites, top organic keywords, geographic distribution of visitors, and more.

The data isn't scraped in real time — SimilarWeb uses a combination of ISP data partnerships, browser extensions that report usage, and modelling to estimate traffic patterns across the web. This means the numbers are approximations rather than exact figures. But for competitive research and market sizing, directional accuracy is usually all you need, and SimilarWeb tends to be directionally reliable for sites with meaningful traffic.

The free version of SimilarWeb is one of the most useful free research tools available. You don't need an account to search a domain — just go to the site, type a URL, and see a summary of its traffic. The paid plans unlock historical data, more detailed breakdowns, and bulk analysis.

Who is it for?

• Founders and product teams validating whether a market is large enough before building
• Marketing managers researching competitor strategy and identifying high-performing channels
• Sales teams qualifying prospects by checking their website's actual audience size and growth
• Content and SEO teams finding competitor keywords and top-performing pages
• Investors and analysts doing due diligence on companies or verticals
• Anyone who wants to know if a website is actually popular before taking it at face value

Key features

• Traffic overview: monthly visits, visit duration, pages per visit, bounce rate — all estimated
• Traffic sources: breakdown of how visitors arrive (organic search, paid ads, social, direct, email, referral)
• Top organic keywords: the search terms driving the most SEO traffic to a domain
• Referral sites: which other sites link and send traffic to the domain
• Geographic distribution: which countries make up the audience
• Competitive set: SimilarWeb suggests similar sites so you can compare multiple competitors at once
• Audience interests: what other categories and topics the audience also visits
• Industry benchmarks: compare a site's metrics against industry averages (paid feature)

Step-by-step setup

1. Go to similarweb.com — no account required to start
2. Type any domain into the search bar (e.g., notion.so, figma.com, yourcompetitor.com)
3. View the traffic overview on the free plan — you'll see total visits, top countries, traffic sources, and top keywords (limited to a few results on the free tier)
4. Create a free account to unlock slightly more data and save your searches
5. For serious competitive research, consider the Starter plan which gives full historical data and detailed keyword lists — most useful for marketing teams
6. Use the Compare feature to benchmark two or three competitors side-by-side
7. Export data to a spreadsheet for further analysis or to share with your team

Tips for getting the most out of it

• Start with the Traffic Sources breakdown. This single view tells you where a competitor's growth is coming from. If 60% is organic search, they've invested in SEO. If 40% is direct, they have strong brand awareness. This shapes your counter-strategy immediately.
• Look at referrals to find media and PR opportunities. The sites sending traffic to your competitor are often publications, newsletters, or communities where you should also be featured.
• Use the keyword list to inform your content strategy. The organic keywords driving traffic to a competitor are a direct map to what topics are worth writing about in your niche.
• Don't treat the numbers as exact. SimilarWeb is best used for directional insights and relative comparisons. If site A has 10x the traffic of site B, that's meaningful. If site A claims exactly 482,000 visits, take that with a grain of salt.
• Combine with Claude for analysis. Copy the traffic breakdown into a Claude conversation and ask it to help you interpret what the competitor's strategy appears to be and where your gaps and opportunities are.