Extension Free Tier Entry Paid Plan API Access BuiltWith 5 lookups/day ~$295/month (Basic) Included in paid Wappalyzer Unlimited extension ~$149/month (Starter) Starter+ RSSHub Radar ...

BuiltWith Alternative Chrome Extension (2026)

Last updated: April 17, 2026

BuiltWith Alternative Chrome Extension: Top Picks for 2026

When you need to quickly identify the technologies powering a website, BuiltWith has long been a go-to tool. However, the market has evolved significantly, and several compelling alternatives offer unique features, better pricing, or specialized capabilities for developers and power users. This guide explores the best BuiltWith alternative Chrome extensions available in 2026.

Why Look for BuiltWith Alternatives?

BuiltWith provides comprehensive technology detection, but users often seek alternatives for several reasons. The free tier limitations can be restrictive, with daily lookups capped at a small number. Some users prefer extensions with real-time detection without clicking, while others need deeper integration with development workflows or API access for automation.

The pricing model is also a sticking point for many individual developers. BuiltWith’s paid plans are priced toward sales teams and agencies doing bulk lead generation rather than toward individual developers who need occasional detailed looks. For a developer who wants to understand a competitor’s stack or verify that a client’s site is running the expected infrastructure, paying for an enterprise-oriented plan is hard to justify.

The good news is that the Chrome Web Store now hosts multiple mature alternatives, each excelling in different areas. Whether you need speed, depth of analysis, or cost-effectiveness, there’s likely a better fit for your specific use case.

Top BuiltWith Alternatives for Chrome

Wappalyzer

Wappalyzer remains the most direct competitor to BuiltWith, offering a Chrome extension that identifies technologies with impressive accuracy. The extension works automatically, displaying detected technologies in a floating icon that expands when clicked.

Key features include:

Automatic detection on page load
Category filtering (analytics, frameworks, CMS, etc.)
Email verification for detected email services
Confidence indicators for uncertain detections

The free version provides sufficient functionality for occasional use, while the paid plans unlock historical data and API access. Wappalyzer’s browser extension is lightweight and rarely impacts page load times.

Wappalyzer’s detection coverage is broad because it is community-maintained. the underlying fingerprint database is open-source and accepts contributions. When a new tool gains adoption and its fingerprints are not yet in the database, someone in the community usually adds them within a few weeks. This means the detection coverage for cutting-edge tools is often better than BuiltWith’s, which relies on a centralized crawl-and-classify approach.

One practical workflow: install Wappalyzer, visit a competitor’s site, and immediately export the detected stack. The exported JSON includes category groupings (analytics, CDN, CMS, e-commerce platform, payment processor, etc.) that map neatly to a competitor analysis spreadsheet.

RSSHub Radar

For developers working with modern web applications, RSSHub Radar offers a different approach. Originally designed to help users discover RSS feeds, it evolved into a comprehensive web technology detector with a focus on modern JavaScript frameworks and meta frameworks.

What sets RSSHub Radar apart:

Detects React, Vue, Svelte, and other SPA frameworks
Identifies static site generators like Next.js, Nuxt, and Gatsby
Shows available RSS feeds for detected blogs and news sites
Open-source and free to use

The extension icon changes color based on what it detects, providing quick visual feedback. Developers building with modern frameworks often prefer this for accurate framework detection.

Where RSSHub Radar particularly shines is distinguishing between frameworks that are often misidentified. For example, a site can be built with Next.js (which renders with React) while also using Remix patterns or React Server Components. RSSHub Radar’s fingerprinting logic goes deeper into the rendered HTML and the network request patterns to make accurate distinctions that simpler tools miss.

Library Detector

Created by the Chrome Developers team, Library Detector is an open-source extension specifically designed to identify JavaScript libraries on any webpage. It provides detailed information about detected libraries, including version numbers when available.

Technical highlights:

Supports over 100 JavaScript libraries
Shows exact library versions
Displays library-specific information (React components, Vue plugins, etc.)
Open-source and actively maintained

This extension excels when you need to understand the JavaScript dependencies of a site, making it invaluable for developers performing competitive analysis or debugging.

The version detection capability deserves special mention. Knowing that a competitor is running React 17 instead of React 19 tells you something about their upgrade cadence and technical debt. Knowing they are still on jQuery 1.x while building a data-heavy product is a signal about constraints they is dealing with. These details are invisible to BuiltWith’s free tier, but Library Detector surfaces them directly in the browser.

Library Detector also exposes framework internals that are useful for debugging your own sites. If you are investigating a rendering issue and need to confirm which version of a dependency is actually running in production (as opposed to what your package.json says), Library Detector gives you ground truth.

StackInspect

StackInspect takes a more developer-focused approach, providing detailed stack information with emphasis on hosting infrastructure and deployment details. It goes beyond simple technology detection to show CDN providers, hosting companies, and infrastructure details.

Notable capabilities:

Infrastructure detection (AWS, Vercel, Netlify, etc.)
CDN identification (Cloudflare, Fastly, etc.)
SSL certificate information
Historical technology changes when available

The extension is particularly useful for DevOps engineers and developers who need to understand a site’s complete infrastructure picture.

Infrastructure detection is the one category where BuiltWith still leads on breadth, but StackInspect closes the gap for the hosting providers and CDNs that matter most in 2026. Identifying that a site routes through Cloudflare with Argo Smart Routing enabled, for instance, tells you something about their latency budget and global availability strategy that no amount of frontend fingerprinting can reveal.

Ghostery

Often categorized as a privacy tool, Ghostery is also a capable technology detector with a different emphasis: it identifies and classifies trackers, advertising networks, and analytics tools with exceptional granularity. For anyone doing privacy audits, ad tech competitive research, or compliance verification, Ghostery provides detail that purpose-built tech detectors miss.

Ghostery’s strengths in this context:

Identifies advertising networks and retargeting pixels
Classifies analytics tools by data collection category
Shows which third-party scripts load and from which domains
Flags potential GDPR/CCPA-relevant trackers

If you need to audit a site’s analytics implementation. either your own or a competitor’s. Ghostery tells you exactly which pixels fired, in what order, and from which vendor domains.

WhatRuns

WhatRuns is a newer entrant that focuses on accuracy over breadth. It detects fewer total categories than Wappalyzer but reports fewer false positives, which makes it useful as a second opinion when you need to be certain about a specific detection.

What makes WhatRuns different:

Notifies you when a site changes its technology stack
Tracks your browsing history to show technology trends across sites you visit
Particularly accurate for e-commerce platform detection (Shopify, BigCommerce, WooCommerce)
Shows WordPress theme and plugin detection

The change notification feature is genuinely unique. If you are tracking a competitor and they switch from Shopify to a custom platform or vice versa, WhatRuns can alert you, which is valuable competitive intelligence that requires either constant manual checking or a paid BuiltWith subscription to get otherwise.

Feature Comparison: Full Matrix

Extension	Free Tier	API Access	Framework Detection	Infrastructure	Version Numbers	Change Alerts	JS Library Depth
BuiltWith	Very limited (5/day)	Paid (expensive)	Good	Excellent	No	Paid	Basic
Wappalyzer	Unlimited	Paid	Good	Basic	No	No	Good
RSSHub Radar	Unlimited	No	Excellent	No	No	No	Good
Library Detector	Unlimited	No	Excellent (JS only)	No	Yes	No	Excellent
StackInspect	Limited	Paid	Good	Excellent	No	No	Basic
Ghostery	Unlimited	No	No (tracker focus)	Basic	No	No	No
WhatRuns	Unlimited	No	Good	Basic	Basic	Yes	Basic

Pricing Comparison

Extension	Free Tier	Entry Paid Plan	API Access
BuiltWith	5 lookups/day	~$295/month (Basic)	Included in paid
Wappalyzer	Unlimited extension	~$149/month (Starter)	Starter+
RSSHub Radar	Unlimited	Free only	Open source
Library Detector	Unlimited	Free only	Open source
StackInspect	Limited lookups	~$29/month	Pro plan
Ghostery	Unlimited	Free (Ghostery Insights from ~$19/month)	Insights plan
WhatRuns	Unlimited	Free only	Not available

The pricing gap between BuiltWith and the alternatives is stark for individual developers. Wappalyzer’s paid plan is designed for teams doing sales prospecting at scale, while the open-source alternatives cost nothing and cover most individual developer use cases.

Building Your Own Technology Detector

For developers who need custom functionality, building a basic technology detector is straightforward using Chrome’s extension APIs. Here’s a minimal example:

// manifest.json
{
 "manifest_version": 3,
 "name": "Tech Detector",
 "version": "1.0",
 "permissions": ["activeTab", "scripting"],
 "host_permissions": ["<all_urls>"]
}
// background.js
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
 if (request.action === "detect") {
 chrome.tabs.query({active: true, currentWindow: true}, (tabs) => {
 chrome.scripting.executeScript({
 target: {tabId: tabs[0].id},
 func: detectTechnologies
 }, (results) => {
 sendResponse(results[0].result);
 });
 });
 }
 return true;
});
function detectTechnologies() {
 const technologies = [];
 // Check for jQuery
 if (window.jQuery) {
 technologies.push({name: 'jQuery', version: jQuery.fn.jquery});
 }
 // Check for React
 if (window.React) {
 technologies.push({name: 'React', version: React.version});
 }
 // Check for Vue
 if (window.Vue) {
 technologies.push({name: 'Vue', version: Vue.version});
 }
 // Check meta tags
 const generator = document.querySelector('meta[name="generator"]');
 if (generator) {
 technologies.push({name: 'CMS', detail: generator.content});
 }
 return technologies;
}

This basic implementation demonstrates the core concepts: injecting a content script, detecting global library objects, and parsing meta tags. You can extend this pattern to detect hundreds of technologies using signature matching.

Extending Detection Coverage

A production-quality detector needs fingerprints that go beyond checking global variables, because many modern bundlers (webpack, Vite, Rollup) do not expose library names on the window object. Instead, they bundle everything into private scope. More reliable detection approaches include:

DOM structure fingerprinting: Many frameworks leave characteristic DOM attributes or class naming patterns. React DevTools finds React in the page by looking for __reactFiber properties on DOM nodes, not by checking window.React.

function detectReactAdvanced() {
 // Modern React apps don't expose window.React
 // Look for React fiber internals on DOM nodes
 const allNodes = document.querySelectorAll('*');
 for (const node of allNodes) {
 const keys = Object.keys(node);
 if (keys.some(k => k.startsWith('__reactFiber') || k.startsWith('__reactProps'))) {
 // Try to find version from source map or script tags
 const scriptTags = document.querySelectorAll('script[src]');
 for (const script of scriptTags) {
 if (script.src.includes('react') && script.src.match(/react[@-](\d+\.\d+\.\d+)/)) {
 return { name: 'React', version: script.src.match(/react[@-](\d+\.\d+\.\d+)/)[1] };
 }
 }
 return { name: 'React', version: 'unknown' };
 }
 }
 return null;
}

Network request pattern analysis: Certain CDN URLs, API subdomains, and asset path patterns are strong signals. A site loading from cdn.shopify.com is almost certainly on Shopify. A site fetching from *.supabase.co is using Supabase as its backend.

function analyzeNetworkPatterns(performanceEntries) {
 const detections = [];
 const urls = performanceEntries.map(e => e.name);
 const patterns = [
 { regex: /cdn\.shopify\.com/, name: 'Shopify' },
 { regex: /supabase\.co/, name: 'Supabase' },
 { regex: /firebaseapp\.com|firebase\.google\.com/, name: 'Firebase' },
 { regex: /amazonaws\.com\//, name: 'AWS S3/CloudFront' },
 { regex: /vercel-scripts\.com|_vercel\//, name: 'Vercel' },
 { regex: /netlify\.com|netlify-cdp/, name: 'Netlify' },
 ];
 for (const url of urls) {
 for (const pattern of patterns) {
 if (pattern.regex.test(url) && !detections.find(d => d.name === pattern.name)) {
 detections.push({ name: pattern.name, source: 'network' });
 }
 }
 }
 return detections;
}

Script source analysis: Even when libraries are bundled, their source maps or version strings often appear in the raw script content or as comments.

async function detectFromScriptContent(scriptUrl) {
 try {
 const response = await fetch(scriptUrl);
 const content = await response.text();
 // Look for version strings in bundled code
 const versionMatches = {
 react: content.match(/react\.version\s*=\s*["']([^"']+)["']/),
 angular: content.match(/["']ANGULAR_VERSION["']\s*,\s*["']([^"']+)["']/),
 vue: content.match(/vue@([0-9]+\.[0-9]+\.[0-9]+)/),
 };
 return Object.entries(versionMatches)
 .filter(([, match]) => match)
 .map(([name, match]) => ({ name, version: match[1] }));
 } catch {
 return [];
 }
}

Practical Workflow: Combining Multiple Extensions

The most effective approach for serious technology research is not choosing a single extension but using two or three in combination. Each has blind spots the others cover.

A recommended combination for a developer doing competitive analysis:

Wappalyzer as the primary detector. broad category coverage, auto-runs on page load
Library Detector as the JavaScript depth layer. version numbers and detailed JS library info
StackInspect for infrastructure questions. hosting, CDN, SSL details

With all three running simultaneously, a typical competitive research session looks like this:

Navigate to a competitor’s site
Wappalyzer shows: Shopify, Google Analytics 4, Klaviyo, Hotjar, React
Library Detector shows: React 18.2.0, Lodash 4.17.21
StackInspect shows: Cloudflare CDN, Fastly, SSL issued by Let’s Encrypt

That combination in under five seconds, with zero API cost. BuiltWith’s free tier would show you partial information and cut you off after a few lookups.

Use Cases by Professional Role

Different professionals get the most value from different extensions:

Frontend developers benefit most from Library Detector and RSSHub Radar. Version numbers and framework detection directly inform technical decisions about compatibility, polyfills, and feature parity.

DevOps and infrastructure engineers should prioritize StackInspect. Identifying CDN providers, load balancer signatures, and hosting platforms is the primary need, and StackInspect’s infrastructure fingerprinting goes deeper than any other free tool.

Sales and business development teams wanting basic “what platform is this company on?” answers are best served by Wappalyzer or WhatRuns. Both are accurate for the CMS, e-commerce platform, and marketing tool categories that matter most for outbound prospecting.

Privacy and compliance professionals need Ghostery. Its tracker classification maps to GDPR/CCPA categories in a way that no general-purpose tech detector does.

Researchers and journalists doing tech landscape analysis should combine Wappalyzer (for broad coverage) with WhatRuns (for change alerts over time).

Choosing the Right Extension

Your choice depends on your primary use case:

General technology profiling: Wappalyzer offers the most balanced feature set
Modern framework detection: RSSHub Radar excels with SPA and meta-framework identification
JavaScript library analysis: Library Detector provides the deepest library insights
Infrastructure investigation: StackInspect reveals hosting and CDN details
Ad tech and tracker auditing: Ghostery provides unmatched granularity for third-party scripts
Competitive stack monitoring over time: WhatRuns change alerts are unique in the free tier

Many power users install multiple extensions, using each for its strengths. The Chrome browser handles multiple technology detection extensions without significant performance impact, because all of these extensions operate on already-loaded page content rather than intercepting network requests.

Conclusion

The BuiltWith alternative ecosystem in 2026 offers diverse options catering to different needs. Whether you prioritize framework detection, infrastructure analysis, or simply need unlimited free lookups, there’s an extension that fits your workflow. For developers, the ability to build custom detectors using Chrome’s APIs provides additional flexibility for specialized requirements.

The most significant shift since 2024 is that the open-source and free alternatives have largely caught up with BuiltWith on detection accuracy for the use cases that matter to individual developers, while remaining far more accessible on price. BuiltWith’s advantage today is primarily in bulk data access and historical technology change data at scale. capabilities that matter for sales intelligence platforms and market research firms, but are overkill for most individual developer workflows.

Explore these alternatives, test them against sites you know, and find the combination that best supports your development and research workflows.

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