Tool Free Tier API Access Open Source DB Size Best For BuiltWith Limited Yes (paid) No 30,000+ Enterprise research, historical data WhatRuns Unlimited No No ~3,000 Quick...

Wappalyzer Alternative Chrome Extension (2026)

Last updated: April 17, 2026

Wappalyzer has become the go-to tool for technology fingerprinting, helping developers and security researchers identify the frameworks, libraries, and services powering websites. However, its pricing changes and limited free tier have pushed many users to explore alternatives that offer comparable functionality without the constraints. In 2026, several Chrome extensions deliver solid technology detection with varying feature sets and pricing models.

This guide evaluates the best Wappalyzer alternatives with Chrome extensions, focusing on detection accuracy, developer features, API access, and overall value. It also covers building your own lightweight detector when off-the-shelf options don’t fit your workflow.

Why Developers Are Looking for Wappalyzer Alternatives

Wappalyzer’s shift toward a paid model changed its value proposition for many use cases. The free tier now limits daily lookups, and API access requires a paid subscription. For individual developers doing occasional tech-stack research, the cost is hard to justify. For teams doing competitive analysis at scale, the API pricing adds up quickly.

Beyond pricing, there are legitimate privacy and operational reasons to consider alternatives:

Data sharing concerns: Free tiers on commercial tools often fund themselves with aggregated browsing data
Self-hosting requirements: Security-conscious organizations may not want extension traffic routed through third-party servers
Detection gaps: No single tool detects every technology, so knowing which tools have better coverage for your target tech stack matters
API integration: Some teams need to embed technology detection in their own pipelines rather than using a browser extension

What Makes a Good Technology Detector

Before evaluating specific tools, consider what matters for your particular use case:

Detection breadth: How many technologies can it identify? The top tools cover 3,000 to 30,000+ named technologies.
Accuracy: False positives waste time. False negatives miss vulnerabilities or competitor insights.
Update frequency: The web moves fast. A tool that hasn’t updated its detection signatures in six months will miss recently popular frameworks.
Developer features: API access, CLI tools, export options, and batch processing determine whether the tool fits into automated workflows.
Privacy: Does the extension send every URL you visit to a remote server? Read the privacy policy before installing.

Top Wappalyzer Alternatives

BuiltWith

BuiltWith maintains one of the largest technology databases available, tracking over 30,000 technologies across millions of websites. The Chrome extension provides instant technology profiling with category filtering.

Key Features:

Real-time technology detection as you browse
Technology history tracking showing when technologies were added or removed
Detailed breakdown by category (CMS, JavaScript frameworks, hosting, CDN, analytics, etc.)
Export results to CSV for reporting
Relationship data showing which technologies commonly appear together

The free tier provides basic detection, while the Pro version unlocks historical data and API access. For developers needing programmatic access, BuiltWith offers a REST API:

// BuiltWith API example. full technology lookup
const fetch = require('node-fetch');
async function getTechnologies(domain) {
 const apiKey = process.env.BUILTWITH_API_KEY;
 const url = `https://api.builtwith.com/v20/api.json?KEY=${apiKey}&LOOKUP=${domain}`;
 const response = await fetch(url);
 if (!response.ok) {
 throw new Error(`BuiltWith API error: ${response.status}`);
 }
 const data = await response.json();
 // Extract technology names from nested structure
 const techs = [];
 if (data.Results && data.Results[0]) {
 const result = data.Results[0];
 if (result.Result && result.Result.Paths) {
 result.Result.Paths.forEach(path => {
 if (path.Technologies) {
 path.Technologies.forEach(tech => techs.push(tech.Name));
 }
 });
 }
 }
 return [...new Set(techs)];
}
getTechnologies('example.com')
 .then(result => console.log(`Technologies: ${result.join(', ')}`))
 .catch(console.error);

BuiltWith’s database is strongest for mature, widely deployed technologies. Coverage for very new or niche frameworks can lag a few months behind actual adoption.

WhatRuns

WhatRuns positions itself as a beginner-friendly alternative with an intuitive interface. The Chrome extension activates on page load and displays detected technologies in a clean overlay without requiring an account.

Key Features:

One-click technology detection with no login required
Component version tracking where detectable
Competitor website analysis with side-by-side comparison
Browser notifications when a technology changes on a tracked domain
Free unlimited detections

The free version offers unlimited detections, making it attractive for casual users and freelancers doing occasional research. The technology database lags behind Wappalyzer and BuiltWith for niche or recently adopted frameworks, but for the mainstream stack. React, WordPress, Shopify, Cloudflare, Google Analytics. coverage is solid.

WhatRuns is a good starting point if you need a zero-cost replacement and don’t require API access or batch processing.

GitHub Wappalyzer (Open Source)

The open-source Wappalyzer repository provides a self-hostable alternative for organizations requiring full control over their technology detection. While the official Chrome extension now requires a subscription, the underlying technology fingerprinting data remains open source under an MIT license.

Self-Hosted Deployment:

Clone the Wappalyzer repository
git clone https://github.com/AliasIO/wappalyzer.git
cd wappalyzer
Install dependencies
npm install
Run detection against a URL
npm start -- --url https://example.com
Output as JSON for pipeline integration
npm start -- --url https://example.com --pretty

For integration into a Node.js script:

const Wappalyzer = require('wappalyzer');
const options = {
 debug: false,
 delay: 500,
 headers: {},
 maxDepth: 3,
 maxUrls: 10,
 maxWait: 5000,
 recursive: true,
 probe: true,
 proxy: false,
 userAgent: 'Wappalyzer',
 htmlMaxCols: 2000,
 htmlMaxRows: 2000,
};
(async () => {
 const wappalyzer = await Wappalyzer.init();
 try {
 const url = 'https://example.com';
 const site = await wappalyzer.open(url, {});
 const results = await site.analyze();
 console.log(JSON.stringify(results, null, 2));
 } catch (error) {
 console.error(error);
 } finally {
 await wappalyzer.destroy();
 }
})();

Self-hosting suits teams wanting to:

Customize detection rules for internal technology stacks
Build automated technology inventories across hundreds of domains
Avoid sending browsing activity to any external service
Integrate detection into existing security or compliance pipelines

The tradeoff is maintenance: you own the detection signature updates. The community pushes updates regularly, but you need to pull them.

Library Detector for Chrome

For developers focused specifically on JavaScript framework detection, Library Detector offers targeted, lightweight functionality. This open-source extension identifies JavaScript libraries with version information where available.

Detection Categories:

Frontend frameworks (React, Vue, Angular, Svelte, Solid, Qwik)
UI libraries (jQuery, Bootstrap, Tailwind, Chakra UI)
State management (Redux, MobX, Zustand, Jotai, Pinia)
Build tools and module bundlers
Testing and utility frameworks

The extension is open-source, lightweight, and does not phone home. Detection happens entirely in the browser using the page’s own JavaScript runtime. it reads properties that frameworks attach to the window object, which is more reliable than pattern-matching script URLs.

// Example of how Library Detector identifies React
// It checks for the React DevTools global hook
const isReact = !!(
 window.__REACT_DEVTOOLS_GLOBAL_HOOK__ ||
 window.React ||
 document.querySelector('[data-reactroot]')
);
// Vue detection
const isVue = !!(
 window.Vue ||
 document.querySelector('[data-v-app]') ||
 window.__vue_app__
);

This runtime inspection approach catches frameworks even when they’re bundled and minified, as long as they expose any global markers. which most do by design for devtools compatibility.

Custom Chrome Extension

For teams with specific detection requirements, building a custom Chrome extension provides maximum flexibility. A custom extension can detect internal tools, proprietary platforms, and specific versions that generic tools ignore.

Basic Extension Structure:

{
 "manifest_version": 3,
 "name": "Custom Tech Detector",
 "version": "1.0",
 "description": "Internal technology detection tool",
 "permissions": ["activeTab", "scripting"],
 "action": {
 "default_popup": "popup.html",
 "default_icon": {
 "16": "icons/icon16.png",
 "32": "icons/icon32.png"
 }
 },
 "content_scripts": [{
 "matches": ["<all_urls>"],
 "js": ["detector.js"],
 "run_at": "document_idle"
 }]
}

// detector.js. Production-grade detection logic
const DETECTION_PATTERNS = {
 // Script src patterns
 scripts: {
 'React': /react(?:\.min)?\.js|react-dom/i,
 'Vue': /vue(?:\.min)?\.js|vue@/i,
 'Angular': /angular(?:\.min)?\.js|@angular\//i,
 'jQuery': /jquery(?:\.min)?\.js/i,
 'Next.js': /\/_next\/static/i,
 'Nuxt.js': /\/_nuxt\//i,
 'Svelte': /svelte/i,
 },
 // Meta tag patterns
 meta: {
 'WordPress': /WordPress/i,
 'Drupal': /Drupal/i,
 'Joomla': /Joomla/i,
 },
 // Window globals
 globals: {
 'React': '__REACT_DEVTOOLS_GLOBAL_HOOK__',
 'Vue': '__vue_app__',
 'jQuery': 'jQuery',
 'Next.js': '__NEXT_DATA__',
 'Gatsby': '___gatsby',
 'Nuxt.js': '__NUXT__',
 },
 // HTML attribute patterns
 attributes: {
 'React': '[data-reactroot]',
 'Vue': '[data-v-app]',
 'Angular': '[ng-version]',
 'Alpine.js': '[x-data]',
 }
};
function detectTechnologies() {
 const detected = new Set();
 // Script source detection
 document.querySelectorAll('script[src]').forEach(script => {
 const src = script.src;
 for (const [tech, pattern] of Object.entries(DETECTION_PATTERNS.scripts)) {
 if (pattern.test(src)) detected.add(tech);
 }
 });
 // Meta generator tag
 const generator = document.querySelector('meta[name="generator"]');
 if (generator) {
 for (const [tech, pattern] of Object.entries(DETECTION_PATTERNS.meta)) {
 if (pattern.test(generator.content)) detected.add(tech);
 }
 }
 // Window global presence
 for (const [tech, global] of Object.entries(DETECTION_PATTERNS.globals)) {
 if (window[global] !== undefined) detected.add(tech);
 }
 // DOM attribute detection
 for (const [tech, selector] of Object.entries(DETECTION_PATTERNS.attributes)) {
 if (document.querySelector(selector)) detected.add(tech);
 }
 // HTTP headers (via meta-equiv or injected data)
 const poweredBy = document.querySelector('meta[http-equiv="X-Powered-By"]');
 if (poweredBy) detected.add(`Server: ${poweredBy.content}`);
 return Array.from(detected);
}
// Send results to popup
chrome.runtime.sendMessage({
 type: 'TECHNOLOGIES_DETECTED',
 data: detectTechnologies(),
 url: window.location.href
});

This custom approach gives complete control over detection rules and data handling. Your company’s internal analytics platform, your custom CMS, or your proprietary CDN can all be added to the detection patterns. something no commercial tool will ever cover.

Comparison Summary

Tool	Free Tier	API Access	Open Source	DB Size	Best For
BuiltWith	Limited	Yes (paid)	No	30,000+	Enterprise research, historical data
WhatRuns	Unlimited	No	No	~3,000	Quick lookups, no account required
GitHub Wappalyzer	Yes	Yes	Yes	~3,500	Self-hosting, pipeline integration
Library Detector	Yes	No	Yes	~200	JS developers, runtime accuracy
Custom Extension	Yes	Custom	Yes	Custom	Proprietary technology detection

Practical Use Cases

Security Audits: Use BuiltWith or self-hosted Wappalyzer to identify outdated technologies before penetration testing. A site still running jQuery 1.x or an unpatched CMS version is an immediate flag for the report.

Competitive Analysis: WhatRuns excels at quick competitor technology stack lookups without API complexity or account setup. Useful for sales teams, product managers, and freelancers evaluating competitors.

Development Troubleshooting: Library Detector quickly reveals framework versions and conflicts during debugging. Knowing that a site loads both React 17 and React 18 simultaneously explains a lot of unexpected behavior.

Enterprise Technology Inventory: Self-hosted Wappalyzer enables complete technology asset tracking across your organization’s external-facing properties. Schedule batch scans, diff results week-over-week, and flag unauthorized technology additions.

Freelance Proposals: When scoping a migration or redesign project, technology detection tells you what you’re working with before writing the proposal. A site on a custom legacy CMS needs a different migration plan than one on standard WordPress.

Combining Multiple Tools

No single tool has 100% coverage. Experienced developers keep two or three detectors available and cross-reference results when a detection seems incomplete or suspicious.

A practical setup for most developers:

WhatRuns for quick, daily browsing. always on, low overhead
Library Detector for JavaScript-heavy apps where framework accuracy matters
Self-hosted Wappalyzer CLI for batch scanning and pipeline integration

When BuiltWith and WhatRuns disagree on a technology, inspect the page source manually. False positives happen when detection patterns are overly broad. detecting React because a script URL contains the string “react” inside an unrelated word, for example.

Choosing the Right Alternative

The best Wappalyzer alternative depends on your specific needs:

Budget-conscious users should start with WhatRuns or Library Detector. both are free with no restrictions
Enterprises benefit from BuiltWith’s comprehensive database and historical tracking capabilities
Privacy-focused teams gain the most from self-hosted Wappalyzer or a custom extension that never sends data externally
JavaScript developers get more accurate framework detection from Library Detector’s runtime inspection approach
Teams with automation needs should use the self-hosted Wappalyzer CLI or BuiltWith API for pipeline integration

Each alternative offers distinct advantages over Wappalyzer’s current free tier. Test two or three options with websites you know well to calibrate which tool’s coverage matches your most common use cases before committing to one as your daily driver.

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