Built With
Find the technology stack of any website. Discover CMS, hosting, and tools.
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What is Built With?
BuiltWith is an open-source web tool designed to identify the technologies, tools, and services used by websites. Its primary purpose is to provide visibility into the technical infrastructure of websites by analyzing their source code, HTTP headers, and other digital fingerprints. Users such as sales teams, AI engineers, investors, and market analysts leverage BuiltWith to track technology adoption trends, uncover competitive insights, and validate business strategies. The tool addresses the challenge of understanding how websites are built by offering a centralized repository of internet technology data, enabling users to make data-driven decisions based on real-world adoption patterns.
How it works
BuiltWith operates as a technology lookup service that aggregates data from live websites to catalog the tools and platforms they employ. It serves as a directory of internet technologies, including analytics, advertising, hosting, and content management systems (CMS), with over 126,000 technologies documented. The tool’s purpose extends beyond simple identification; it provides context through metrics like the number of live websites using a specific technology, such as Shopify’s 6.9 million active sites or Salesforce’s 169,600. This data helps users assess market penetration and technological shifts. BuiltWith enables users to analyze a website’s technology stack by entering a URL, revealing details like server software, scripting languages, and third-party services. It also tracks historical adoption trends, offering insights into how technologies evolve over time. For example, users can observe the rise of AI-related tools or the decline of legacy systems.
How to use it
- 1Navigate to BuiltWith.com and enter a website URL into the search bar. 2. Click 'Look Up' to retrieve the site’s technology stack. 3. Explore the results, which include server details, CMS platforms, analytics tools, and advertising networks. 4. Use the 'Trends' section to view adoption data over time. Practical tips: Filter results by technology category, compare multiple websites side-by-side, and bookmark frequently analyzed domains for tracking changes. For advanced use, leverage the API documentation to integrate data into custom workflows.
What it can do
- Utility
Use cases
Assumptions and limitations
Assumptions
- source: https://github.com/buildwith
- license: Open source
- privacy: Opens an external demo
Limitations
- The tool relies on publicly accessible website data, which may exclude private or dynamically generated content.
- Adoption metrics are based on live websites, which may not reflect current internal tool usage.
- Some technologies may be misidentified due to obfuscation or generic headers.
- The open-source nature limits advanced customization compared to proprietary alternatives.
- Historical data may have gaps for technologies adopted after BuiltWith’s dataset cutoff.
Understanding the result
Find the technology stack of any website. Discover CMS, hosting, and tools.
Tool details
- Clearly flagged when a network request is needed.
- No account, no sign-up, and no tracking of your content.
- Powered by buildwith (MIT).
- Built with
- buildwith (https://github.com/buildwith)
- License
- MIT
- Runs locally
- No — requires a network request
- Verification
- Not yet verified
- Input
- Text
- Output
- Output
Built with https://github.com/buildwith. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.
- Built with
- buildwith
- License
- MIT
Open-source project
OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.
References
- /buildwith — GitHub Repository
Upstream project · GitHub
Frequently asked
What technologies does BuiltWith cover?
BuiltWith catalogs over 126,000 internet technologies, including analytics tools (e.g., Google Analytics), advertising networks (e.g., AdSense), hosting platforms (e.g., AWS), CMS systems (e.g., WordPress), and developer tools (e.g., React). It also tracks emerging technologies like AI frameworks and serverless architectures.
How does BuiltWith analyze website technologies?
The tool uses automated crawlers to inspect live websites, extracting information from HTTP headers, source code, and rendered pages. It identifies server software (e.g., Apache), scripting languages (e.g., PHP), and third-party services (e.g., Google Fonts) by parsing their unique identifiers and API endpoints.
How can I find the number of websites using a specific technology?
Navigate to the 'Trends' section on BuiltWith.com, search for the technology (e.g., 'Shopify'), and view the 'Live Websites' metric. For example, Shopify has 6,969,046 live websites listed as of the latest data. Use filters to narrow results by category or region.
How does BuiltWith compare to tools like SimilarWeb or Ahrefs?
BuiltWith focuses exclusively on technology stack analysis, while tools like SimilarWeb and Ahrefs prioritize traffic analytics and SEO metrics. Unlike BuiltWith, SimilarWeb requires a paid subscription for detailed reports, and Ahrefs emphasizes backlink data rather than technical infrastructure.
What should I do if BuiltWith cannot find a website’s technology?
Ensure the URL is correct and publicly accessible. If the site uses dynamic content or obfuscation techniques, the results may be incomplete. Try alternative URLs or check for recent changes in the site’s infrastructure. For persistent issues, report the case via BuiltWith’s support channels.