Similarweb vs SpyFu: pricing, features and which to choose

Founded in 2007 by Or Offer in Tel Aviv, Similarweb is a digital data and analytics company operated by Similarweb Ltd., which trades publicly on the New York Stock Exchange under SMWB. The company reports more than 1,000 employees across six continents and analyzes over 100 million websites, 4 million apps, 235 million product SKUs, 10 years of historical data, 10 billion content pages, 250 million display ads, 5 billion search terms, and more than 20 million companies. Its offerings include software subscriptions, data feeds, and advisory services for marketing, sales, ecommerce, research, investment, and strategy teams. In practice, these products help users compare digital activity, assess markets, identify prospects, and support decisions with measurable online indicators.

Similarweb is a digital analytics platform for comparing estimated activity across websites, apps, keywords, companies, and technologies. Users can examine traffic, engagement, acquisition channels, audiences, search terms, advertising, rankings, referrals, and competitors, with available filters for country, device, timeframe, and segment. Its products cover Web Intelligence, Market Intelligence, App Intelligence, Sales Intelligence, SEO, advertising, generative AI, dashboards, reporting, conversion analysis, and custom data feeds. A limited free service offers high-level data, while listed Web Intelligence plans start at $199 monthly or $1,500 annually for Starter. Higher tiers add historical depth, country filtering, rank and ad tracking, market intelligence, APIs, integrations, security, and custom dashboards. Teams should assess data limits, permitted uses, and integration needs before choosing a plan.

Similarweb’s main weakness is cost, especially for country-level analysis, longer history, backlink research, and larger exports. Its traffic and engagement figures are estimates, so companies should use first-party analytics for sites they own. Semrush, Ahrefs, and SE Ranking offer more conventional SEO workflows, particularly for backlink-focused work. Similarweb covers a wider set of needs, including websites, apps, audiences, advertising, markets, companies, and technologies, which can help teams compare external digital activity and identify shifts across channels. That wider scope may support market planning, sales prospecting, investment analysis, and competitive reviews, but the listed paid plans become expensive as data depth and access increase. Similarweb suits teams that value broad competitor and market intelligence more than a low-cost SEO toolkit, while Semrush, Ahrefs, or SE Ranking fit SEO specialists prioritizing rankings and links.

SpyFu is a search marketing research tool based in Scottsdale, Arizona, founded by Mike Roberts and built on keyword data he began collecting in 2005. Its long history is the main selling point: SpyFu says it stores more than 10 years of ranking and ad data per domain, and its marketing cites 18-plus years of keyword history. It sits in the same category as Semrush and Ahrefs but costs much less and focuses more on paid search. A user types a competitor's domain and sees the keywords it ranks for organically, the keywords it bids on in Google Ads, the ad copy it has tested over time and estimates of monthly clicks and spend.

Most sessions start with a domain search. The overview shows organic and paid keyword counts, estimated traffic value and top competitors. From there, users drill into the most profitable paid keywords, ad history showing every ad variation a competitor has run, and Kombat, which compares up to three domains to find keywords the others share and you lack. Keyword research covers volume, difficulty, cost per click and related questions. Backlink search, rank tracking, automated reports and a Google Ads Advisor that suggests keywords to buy round out the tool. A Site Audit crawler with AI fixes, added in 2026, checks technical SEO and can publish corrections to connected sites.

SpyFu's data is weakest outside the US and UK, and its backlink index is smaller than Ahrefs'. Technical SEO tools are newer and thinner than Semrush's, and the interface feels dated next to newer tools. Semrush covers more channels, including social and local, but starts around $140 a month. Ahrefs has the strongest backlink data, and Similarweb gives better traffic estimates for large sites. SE Ranking offers broad SEO features at a similar price to SpyFu. Pick SpyFu if your priority is seeing competitors' Google Ads keywords and ad tests over many years for little money; pick Semrush or Ahrefs for full SEO programs.