description Wappalyzer Overview
Wappalyzer is a free online tool that analyzes websites to identify the technologies used in their construction, including programming languages, scripting engines, libraries, and server software, providing insights into website development.
help Wappalyzer FAQ
Is Wappalyzer free to use?
Yes, Wappalyzer is available as a free browser extension for Chrome, Firefox, and Edge, allowing you to instantly see the technologies powering any website you visit. It identifies content management systems, JavaScript frameworks, analytics tools, advertising platforms, and web servers. A paid API and enterprise plan are also available for bulk analysis and lead generation.
How does Wappalyzer identify the technologies used on a website?
Wappalyzer works by analyzing HTTP response headers, HTML source code, JavaScript variables, cookies, and CSS patterns to fingerprint known technologies. It maintains a regularly updated ruleset that matches these signals to specific tools like WordPress, React, Google Analytics, or Cloudflare. The detection is heuristic and can sometimes miss custom or heavily modified implementations.
Can Wappalyzer detect if a site uses Shopify, WordPress, or Squarespace?
Yes, Wappalyzer reliably detects major CMS and e-commerce platforms including WordPress, Shopify, Squarespace, Wix, and Drupal by looking for platform-specific markers in the page source and headers. It will also often identify the specific WordPress theme or plugins in use. For sites behind aggressive caching or CDNs, detection accuracy may decrease.
Does Wappalyzer have an API for bulk technology lookup?
Yes, Wappalyzer offers a paid API that allows developers and sales teams to look up the technology stacks of websites at scale, which is commonly used for B2B lead generation and competitive analysis. The API returns structured JSON data about detected technologies. Pricing is tiered based on the number of lookups per month, with a free tier offering limited queries.
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