// Free Developer Tool
Paste any website's HTML source code and identify the frameworks, CMS, analytics tools, and backend technologies powering it. No login, no extension, no server calls.
// Paste HTML source, <head> section, or HTTP headers
// Results will appear here after you paste and click Analyze.
// Example output — what a typical analysis looks like
This tech stack detector identifies technologies by scanning HTML source code for script references, CSS class patterns, meta tags, comment blocks, and global JavaScript variables — the same signals browser extensions use, without requiring any extension.
Unlike Wappalyzer or BuiltWith, this tool requires no browser extension, no account, and no URL submission. All analysis happens locally in your browser.
You can also paste just the <head> section or raw HTTP response headers from your browser's Network tab for a faster, focused analysis.
Wappalyzer and BuiltWith are powerful commercial platforms — but they require accounts, browser extensions, or paid plans for full access. This tool is a free, no-account alternative for developers who need quick, private tech stack analysis.
| Feature | This Tool | Wappalyzer | BuiltWith |
|---|---|---|---|
| Free to use | ✓ Always free | Limited free tier | Limited free tier |
| Login required | ✓ No account | ✗ Account needed | ✗ Account needed |
| Browser extension | ✓ Not required | Extension recommended | Extension available |
| Data privacy | ✓ 100% client-side | Server-side analysis | Server-side analysis |
| Bulk / API access | ✗ Single-page only | ✓ Paid plans | ✓ Paid plans |
Need bulk analysis or CRM integration? Wappalyzer and BuiltWith are better fits. For quick, private, one-off analysis — this tool is faster and requires nothing.
Find out exactly what frameworks and tools your competitors use to build and run their product. Identify performance advantages or infrastructure weaknesses.
Before taking on a project, quickly audit what a client's site is built with. Estimate migration effort, compatibility issues, and refactoring scope.
Reverse-engineer sites you admire. Discover if that fast-loading site uses Next.js on Vercel, or if that store runs Shopify with a custom theme.
Identify outdated CMS versions, vulnerable plugins, or misconfigured analytics. Tech stack analysis is often the first step in a security review.
Researching a company before an interview? Knowing their stack helps you prepare the right technical questions and highlight relevant experience.
Validate your tech decisions by seeing what successful companies in your space actually use in production — not just what they claim in blog posts.
These are common questions from developers trying to identify website technologies — the kind of questions you'd find discussed on Reddit, Stack Overflow, or dev forums.
How do I know what framework a website uses without installing an extension?
The easiest method: open the page source (Ctrl+U), search for keywords like reactdom, __nuxt, wp-content, or shopify. Or paste the source into this analyzer and get results in seconds.
Is there a free Wappalyzer alternative that doesn't require an account?
Yes — this tool. Wappalyzer's free tier has query limits and requires registration. This analyzer is 100% free with no account and runs entirely in your browser. The tradeoff is that you need to copy-paste HTML manually instead of entering a URL.
How can I tell if a site uses React, Vue, or Angular?
React leaves traces like data-reactroot or __react. Vue uses __vue__ or data-v- prefixes. Angular adds ng-version or ng-app attributes. Paste the HTML here and the analyzer identifies all three automatically.
How do I detect what CMS a website is using from the source code?
WordPress sites almost always include paths like /wp-content/ or /wp-includes/. Shopify uses cdn.shopify.com. Webflow injects a webflow-badge. This tool checks for all of these patterns across 10+ CMS platforms simultaneously.
Can I use this on a password-protected or staging site?
Yes. Because you're pasting HTML directly — not entering a URL — this tool works on any source code you can access, including staging environments, localhost builds, or client previews behind login walls.
Why does BuiltWith show different results than this tool?
BuiltWith fetches and analyzes the live site from their servers and has a historical database of technology usage. This tool only analyzes the HTML you paste, which may be a single snapshot. If the site uses server-side rendering or lazy-loads scripts, some technologies may not appear in the initial source.
A tech stack (short for technology stack) is the combination of programming languages, frameworks, libraries, databases, and infrastructure tools used to build and run a web application. It typically includes a frontend layer (what users see and interact with), a backend layer (server logic and APIs), a database layer, and supporting tools like CDNs, analytics platforms, and deployment services.
Common examples include the MEAN stack (MongoDB, Express, Angular, Node.js), the LAMP stack (Linux, Apache, MySQL, PHP), and modern JAMstack architectures using Next.js, Vercel, and headless CMS platforms. Understanding a competitor's or client's stack helps with competitive analysis, cost estimation, hiring decisions, and infrastructure planning.
Frontend technologies like React, Vue, and Angular are usually detectable from HTML source code. Backend technologies like PHP, Django, or Laravel sometimes expose themselves through HTTP response headers, cookie names, or comment patterns. This analyzer checks for all of these signals automatically.
reactdom or a data-reactroot attribute. WordPress sites include paths like /wp-content/. This tool matches those patterns across 70+ known technology signatures.
<head> section. Highly customized or obfuscated sites may hide framework signatures. You can also paste HTTP response headers from your browser's Network tab (DevTools → Network → click the main document → Headers).