Screaming Frog vs SpyFu

What Screaming Frog is

Screaming Frog is a desktop crawler that walks your site like a search engine and reports technical problems. Running on your own machine means no crawl quota and full control over speed, headers and rendering, which matters on large or access-restricted sites. In exchange, crawl size is limited by your RAM and there is no scheduled monitoring unless you set it up yourself.

What SpyFu is

SpyFu shows which keywords competitors bid on and rank for, with historical data going back years. That archive is the reason to use it: rather than a snapshot of today's rankings, you can see how long a competitor has defended a term, which ad copy they kept running, and which campaigns they abandoned. Coverage is strongest for the US market and thinner elsewhere, and the data is modelled rather than taken from ad accounts, so treat the figures as direction rather than measurement.

What Screaming Frog is built to do

Desktop site crawler

Crawls a site locally and reports status codes, redirects, titles and canonicals.

JavaScript rendering

Renders pages with a headless browser to crawl client-side content.

API integrations

Pulls Search Console, Analytics and PageSpeed data onto crawled URLs.

What SpyFu is built to do

Competitor keyword history

Years of ranking and bidding history for a domain, not just the current position.

Ad copy archive

Every paid advert a competitor has run, which shows the messages they kept and dropped.

Keyword gap analysis

Terms competitors rank for and you do not, ranked by opportunity.

Unlimited searches

Plans are not metered per lookup, which suits exploratory research.

Choose Screaming Frog if

• Anyone responsible for technical SEO on a site of real size.

Choose SpyFu if

• Marketers researching competitor paid and organic strategy.

Screaming Frog: pros & cons

• Finds technical issues nothing else catches
• One-off annual licence, no per-seat cloud fees
• Crawls as deep as your machine allows
• Desktop only, no collaboration
• Output needs SEO knowledge to interpret
• Large sites need a powerful machine

SpyFu: pros & cons

• Deep historical ad and keyword data
• Inexpensive relative to rivals
• Useful competitor ad history
• Data accuracy varies by market
• Interface feels dated
• Weaker outside the US