What is BuiltWith?
BuiltWith looks up a website and lists the technologies it detects on it: content management system, analytics and tracking tools, advertising networks, hosting, frameworks, ecommerce platforms and more. The company says it covers more than 128,000 internet technologies and builds its data by indexing the web itself rather than buying it from third parties. Usage trends for each technology are also published.
Most paying customers use it for sales leads and market research, but a single site lookup is free and is a common step in open source research. Seeing which analytics, ad or hosting services a site uses can help researchers understand who runs it, how it makes money and how it relates to other sites. Paid plans add lead lists, exports, spend and revenue estimates, CRM integrations and an API.
Main Features
- Free lookup of the technologies detected on any website
- Coverage of more than 128,000 web technologies
- Technology usage trends over time
- Lead lists by technology, keyword, country and more on paid plans
- Exports to CSV and Excel with no data locked in
- Browser extensions for quick lookups
- API, datasets and an MCP server for developers
How to Get Started with BuiltWith
- Open builtwith.com.
- Type a domain into the lookup box and run the search.
- Read the detected technologies, grouped by type such as analytics, hosting and CMS.
- Sign up for a paid plan only if you need lists, exports or the API.
BuiltWith Pricing
BuiltWith is free for individual site lookups. Paid plans are Basic at $295 a month, Pro at $495 a month and Team at $995 a month, with yearly billing and a Team Ultra plan also available. Plans can be cancelled at any time, with a one month minimum term.
Who Should Use It?
- OSINT researchers profiling the technology behind a website
- Journalists looking into who runs a site and how it makes money
- Security teams auditing third-party scripts and services
- Sales and marketing teams building lead lists
- Analysts and investors studying technology adoption
BuiltWith Alternatives
- urlscan.io: a free scanner that records the requests, scripts and links a web page loads.
- ViewDNS.info: free DNS, WHOIS and IP lookup tools, including reverse IP and IP history.
- DNSDumpster: a free tool for mapping the DNS records and subdomains of a domain.
Frequently Asked Questions
Is BuiltWith free?
Yes for single website lookups, which BuiltWith says are free forever. Lead lists, exports and the API need a paid plan starting at $295 a month.
How does BuiltWith know what a site uses?
BuiltWith says it indexes the web in a similar way to a search engine and detects technologies from what each site loads. It does not get its data from third parties. Detections reflect what was visible when the site was crawled, so recent changes may not show yet.
How is BuiltWith used in open source research?
Researchers use the list of analytics, advertising and hosting services on a site to understand how it is run and funded, and to compare it with other sites. Shared services are a lead to check against other evidence, not proof that two sites have the same owner.