Best Free Website Technology Checker Tools in 2026

What to Look for in a Website Technology Checker

Before diving into specific tools, here are the key criteria that separate a great technology checker from a mediocre one:

• Detection breadth: Does it detect CMS, JavaScript frameworks, analytics, CDNs, hosting, payment processors, and more?
• Live vs. cached data: Does it scan the site right now, or serve results from a crawl that may be weeks or months old?
• Accuracy: Does it produce false positives, or confidently report technologies that are no longer in use?
• Free tier limits: How many scans can you do for free? Are there paywalls on common data points?
• Bulk scanning: Can you analyse multiple URLs at once?
• API access: Is there an API for programmatic lookups?

1. Web Reveal – Best Overall Free Tool

Web Reveal is a completely free website technology scanner that performs live detection on any URL—no account required, no limits on scans, no paywalled technology categories.

Enter a URL and Web Reveal analyses the live website in real time, returning a comprehensive breakdown of:

• CMS and e-commerce platforms (WordPress, Shopify, Wix, Webflow, Squarespace)
• JavaScript frameworks and libraries (React, Vue, Angular, Next.js, Nuxt, Svelte)
• Analytics and tracking tools (Google Analytics, Hotjar, Segment, Mixpanel)
• CDN and performance tools (Cloudflare, Fastly, AWS CloudFront)
• Hosting providers (AWS, GCP, Vercel, Netlify, DigitalOcean)
• Payment processors, tag managers, A/B testing tools, and more

The Web Reveal Chrome extension surfaces this data passively as you browse—no need to manually scan each URL. A bulk scanner lets you analyse multiple domains in one session, and an API is available for developers who need programmatic access.

Best for: Anyone who needs accurate, live technology detection for free—developers, marketers, sales teams, and researchers.

2. Wappalyzer – Popular Browser Extension

Wappalyzer is a well-known browser extension that displays a website's technology stack in a toolbar popup. It has a large detection library and broad community recognition, making it a default recommendation for many developers.

Strengths: Large technology database, recognisable brand, available as a browser extension and API.

Limitations: The free tier has become increasingly restricted in recent years—many technology categories and bulk lookup features require a paid subscription. Detection relies on a technology fingerprint database rather than live analysis, so results can be out of date.

Best for: Users familiar with the tool who are comfortable with the free tier's limitations, or teams willing to pay for the API.

3. BuiltWith – Best for Market Research

BuiltWith is a comprehensive website profiling tool that excels at large-scale market research. It maintains a massive historical database of technology adoption across millions of websites, enabling queries like "which e-commerce sites use Shopify Plus in the UK?"

Strengths: Deep historical data, technology market share reports, large database with trend information.

Limitations: Free lookups are limited in depth and data freshness. Full access to lists and lead generation features requires an expensive subscription. Detection is database-driven rather than live.

Best for: Sales and marketing teams needing technology-based lead lists; market researchers studying technology adoption trends at scale.

4. WhatRuns – Lightweight Browser Extension

WhatRuns is a lightweight, free browser extension that displays technology information in a sidebar panel as you browse. It is simple to use and completely free with no sign-up required.

Strengths: Entirely free, simple interface, no account required, real-time detection via extension.

Limitations: No web-based scanner or API, narrower detection library than Web Reveal or Wappalyzer, no bulk scanning capability.

Best for: Developers who want a no-frills browser extension and do not need bulk or API features.

5. W3Techs – Best for Aggregate Statistics

W3Techs specialises in web technology survey data—it publishes detailed reports on the market share of CMS platforms, server software, programming languages, and more across the top 10 million websites.

Strengths: Industry-standard statistics referenced by major publications; free public reports on technology market share trends.

Limitations: Individual website lookups are limited compared to other tools. The focus is on aggregate data rather than per-site tech stack analysis.

Best for: Researchers and writers citing web technology statistics; those wanting to understand broad technology adoption trends.

6. Netcraft – Best for Security Context

Netcraft combines website technology detection with security information—hosting history, SSL certificate data, phishing records, and infrastructure risk signals. It has been operating since 1995 and maintains a comprehensive historical dataset.

Strengths: Security-oriented context alongside technology data; long historical record; useful for due diligence and fraud detection.

Limitations: Less user-friendly interface than modern alternatives; detection breadth for application-layer technologies (frameworks, analytics) is narrower; some advanced features require an account.

Best for: Security researchers, fraud analysts, and anyone who needs both technology and infrastructure security context for a domain.

Side-by-Side Comparison

Frequently Asked Questions

What is the best free website technology checker?

Web Reveal is the best fully free website technology checker in 2026. It detects CMS, JavaScript frameworks, analytics, CDNs, hosting, and more with no sign-up, no limits, and live detection rather than cached data.

How do I check what technology a website uses?

Enter the website's URL into Web Reveal. The scanner analyses the live site and returns a complete technology stack breakdown within seconds. Alternatively, install the Web Reveal Chrome extension to see technology data automatically while browsing.

Can I check website technology without creating an account?

Yes. Web Reveal requires no account or sign-up. WhatRuns and the basic W3Techs lookup are also completely account-free. Wappalyzer and BuiltWith require registration for any meaningful free usage.

What types of technologies can these tools detect?

Modern website technology checkers can detect CMS platforms, JavaScript frameworks, analytics tools, CDNs, hosting providers, payment processors, A/B testing tools, chatbots, marketing automation platforms, tag managers, and more. Web Reveal covers all of these categories in its free tier.