Best BuiltWith Alternatives in 2026: Free & Paid Website Technology Detectors

What Is BuiltWith and Why Look for Alternatives?

BuiltWith.com is a technology profiling service that indexes the technologies used by millions of websites—CMS platforms, analytics tools, advertising trackers, e-commerce software, CDNs, JavaScript libraries, and more. I used it myself for competitive research and lead generation before the pricing pushed me to look elsewhere.

From my own experience and from talking to others who've gone through the same search, here are the most common reasons people look for BuiltWith alternatives:

• Cost. BuiltWith's paid plans are subscription-based and can be expensive, which may be out of reach for individual developers, freelancers, and small teams who only need occasional lookups. Always check BuiltWith's current pricing page for the latest rates.
• Real-time accuracy. BuiltWith relies on crawled and cached data, so results can lag behind a site's actual current state by days or weeks. In my testing, I found this mattered more than I expected.
• Browser-based workflow. Some users prefer a lightweight browser extension that detects technologies as they browse, rather than looking up URLs in a separate web interface.
• API access. Developers building integrations or automated pipelines often look for tools with more flexible API pricing.
• Privacy. Some tools operate entirely client-side (in the browser), meaning your lookup queries never leave your device.

Whatever your reason, the alternatives I tested below span a range of use cases—from free browser extensions to enterprise-grade lead-generation platforms. All tool descriptions are based on publicly available information; features, pricing, and availability may change—always verify on each tool's official website before making a purchasing decision.

Quick Comparison Table

The table below summarises the main characteristics of each tool at a glance. Detailed write-ups follow below.

1. Web Reveal – Best Free Real-Time Website Technology Scanner

Web Reveal is the tool I built after spending weeks testing alternatives and finding that none of them quite closed the gap I kept running into. I wanted live, real-time detection with no paywall, no registration requirement, and no stale crawl data. It identifies technologies across key categories including CMS platforms (WordPress, Drupal, Shopify, Wix), JavaScript frameworks (React, Vue, Angular, Next.js), analytics tools, CDNs, hosting providers, server software, and more. It is available as both a Chrome extension and a web-based scanner.

I built Web Reveal to run a fresh request and detection pass for each scan. What you see in the results is based on what is observable at scan time—current HTML, headers, and infrastructure signals—rather than data from a crawl that may be months old. That was the specific frustration that pushed me to build it.

What Web Reveal detects

• Content management systems (CMS): WordPress, Joomla, Drupal, Shopify, Squarespace, Wix, Webflow, Ghost, and more
• JavaScript frameworks and libraries: React, Vue.js, Angular, Next.js, Nuxt.js, Svelte, jQuery, and others
• Analytics & marketing: Google Analytics, Segment, Hotjar, Facebook Pixel, HubSpot, and dozens more
• CDNs & hosting: Cloudflare, AWS CloudFront, Fastly, Vercel, Netlify, and similar providers
• Web servers: Apache, Nginx, Caddy, IIS, Cloudflare
• E-commerce: WooCommerce, Shopify, Magento, BigCommerce
• DNS-based hosting detection for greater accuracy

Key features

• Completely free for individual URL lookups—no account required
• Bulk scanner to analyse multiple URLs in a single session
• Chrome extension that detects technologies as you browse any page
• Public scan results pages for easy sharing and reference
• API access for developers who need programmatic lookups—see the documentation for details

Who it's best for

Web Reveal is what I'd recommend to developers, freelancers, designers, and anyone who needs quick, accurate technology lookups without a subscription. Its free tier covers the vast majority of everyday use cases. The full feature set includes DNS-based hosting detection and backend framework analysis—capabilities that go beyond what most free tools offer. I am biased here since I built it, but the honest reason I built it is because nothing else did all of this for free.

Bottom line: If you're looking for a genuinely free BuiltWith alternative that delivers real-time, live detection, Web Reveal is the strongest option in 2026.

2. Wappalyzer – Browser Extension for Technology Profiling

Wappalyzer was one of the first tools I tested, and it has millions of installs across Chrome and Firefox for good reason. The browser extension identifies technologies as you visit any website, displaying a categorised list in the toolbar popup—which is genuinely useful when you're in the middle of prospecting and just want a quick read on a site you've navigated to. Note that Wappalyzer has changed ownership and pricing models over the years (most recently around 2023–2024); the information below reflects what was publicly available at the time of writing—verify current features and pricing on the official Wappalyzer website.

Wappalyzer also offers a web application and API. Free accounts get a limited number of lookups per month; paid plans may unlock bulk exports, lead lists, and technology trend data. The API has developer documentation available, making Wappalyzer a popular choice for teams who want to integrate detection into their own tools.

Strengths

• Large technology database spanning thousands of detectable technologies
• Available for both Chrome and Firefox
• API with documentation for developers
• Bulk URL analysis available on paid plans

Limitations

• Free API lookups are limited; pricing can add up for heavy users
• The browser extension may use server-side data for some results, which may not always reflect the live state of a site
• Pricing and feature availability have changed over time—check the official site for current details

3. WhatRuns – Lightweight Free Browser Extension

WhatRuns was the most stripped-back tool I tested. It's a free browser extension for Chrome and Firefox that identifies the technologies running on any website, with no web application, bulk scanner, or API to speak of. What I noticed is that if your workflow is entirely browser-based and you don't need to look up URLs outside of your normal browsing, WhatRuns is a solid, no-cost choice. It does not try to be more than it is.

Strengths

• 100% free with no usage limits
• Minimal, unobtrusive interface
• Available for Chrome and Firefox
• Detects a good range of common technologies

Limitations

• No web scanner for looking up URLs without visiting them
• No API or bulk export capability
• Detection coverage is narrower than tools like Wappalyzer or Web Reveal

4. W3Techs – Best for Web Technology Market Share Research

W3Techs (Web Technology Surveys) is a free service that provides statistics on the usage of web technologies across the top 10 million websites. What surprised me about W3Techs is that it occupies a genuinely different niche from the other tools here—it is less about profiling individual sites and more about understanding broad industry trends, such as what percentage of websites use WordPress or how HTTPS adoption has changed over time. I found it useful for background research rather than for competitive intelligence.

You can look up individual domains on W3Techs, but the primary value is in its market share data, which is updated regularly and freely accessible. There is no browser extension or API.

Strengths

• Completely free
• Excellent for market share and trend research
• Regular methodology transparency and publication of survey methodology

Limitations

• Individual site lookups are limited and less detailed than dedicated profilers
• No browser extension or API
• Not suited for competitive research on specific companies

5. SimilarTech – Designed for B2B Sales Prospecting

SimilarTech is a platform built primarily for B2B sales and marketing teams. What I found when I tested it is that it is genuinely closest to BuiltWith in terms of use case—you can build lead lists based on the technologies a website uses, for example finding e-commerce stores that use a specific platform in a given country. Note that SimilarTech is an independent product with its own features, pricing, and data methodology—visit the SimilarTech website for current details.

SimilarTech offers a Chrome extension for per-site detection as well as a web app for bulk research. Pricing is subscription-based; free access is limited.

Strengths

• Lead generation and prospecting features aimed at sales teams
• Technology-based filtering for building targeted prospect lists
• Chrome extension for quick per-site lookups

Limitations

• Primarily a paid product; free functionality is limited
• Overkill if you just need to look up individual sites occasionally
• Data freshness depends on SimilarTech's crawl schedule—results may not reflect real-time changes

6. Netcraft – Best for Server and Security Research

Netcraft has been providing internet research and security services since 1996. When I tested it, what stood out is that it sits in a different category from the other tools here—its technology is widely used by browsers and security vendors to detect phishing sites, malware, and fraudulent domains. For technology profiling, Netcraft offers both a browser extension (for Chrome and Firefox) and a web-based lookup tool that surfaces detailed server information including web server software, hosting provider, SSL certificate data, and uptime history.

What I found is that Netcraft is particularly strong for security-oriented research—understanding a site's hosting infrastructure, certificate details, and server history. Its technology detection for application-layer technologies (CMS, frameworks) is less comprehensive than tools like Web Reveal or Wappalyzer.

Strengths

• Excellent server and infrastructure data (hosting, web server, SSL)
• Long historical records for domains and IP addresses
• Widely trusted for anti-phishing and security research
• Free browser extension

Limitations

• Less comprehensive for application-layer technology detection (CMS, frameworks, analytics)
• API access requires a paid plan
• Not optimised for marketing or lead generation use cases

How to Choose the Right Website Technology Detection Tool

Based on everything I tested, here is what I would actually recommend depending on your situation:

• For free individual lookups and real-time detection: Web Reveal is what I use and what I'd recommend first. It's live, free, and requires no sign-up. I built it for exactly this use case.
• For browser-based detection while you browse: Wappalyzer (freemium) or WhatRuns (free) are both solid browser extensions. If you want truly zero friction and don't care about the web app, WhatRuns is the simpler pick.
• For market share research and industry trends: W3Techs is the right tool here—it's free and genuinely purpose-built for that kind of macro analysis.
• For B2B lead generation at scale: BuiltWith and SimilarTech are the established options and I'm not going to pretend otherwise. If you genuinely need a list of 5,000 companies using a specific platform, those paid platforms are worth evaluating. Always verify current pricing and features on their respective websites.
• For server infrastructure and security research: Netcraft is the specialist here. I found its server-level data—SSL certificates, hosting history, uptime—to be considerably more detailed than what the other tools surface.
• For developer integrations and API access: Web Reveal's API, Wappalyzer's paid API, and Netcraft's paid API are the main options. Compare each tool's API documentation, rate limits, and pricing before committing.
• For bulk scanning multiple URLs quickly: Web Reveal's bulk scanner is free and runs directly in your browser without requiring a paid subscription.

If you're a developer, agency, or digital marketer who wants a fast, accurate, and completely free tool for technology detection, I'd start with Web Reveal—both the web scanner and the Chrome extension—before committing to a paid subscription elsewhere.

Disclaimer: Tool features, pricing, and availability change over time. All information in this article is provided for general guidance only. Always consult each tool's official website for the most up-to-date details. We are not affiliated with BuiltWith, Wappalyzer, WhatRuns, W3Techs, SimilarTech, or Netcraft. Trademarks belong to their respective owners.

Frequently Asked Questions

Is there a free alternative to BuiltWith?

Yes. Web Reveal offers a completely free web scanner and Chrome extension that detects CMS platforms, JavaScript frameworks, analytics tools, CDNs, hosting providers, and more—no sign-up required for basic use. Wappalyzer and WhatRuns also offer free browser extensions, though their free tiers have some usage limits.

What is the best BuiltWith alternative for bulk lookups?

Web Reveal's bulk scanner lets you analyse multiple URLs in a single session directly in your browser, with no subscription required. For large-scale API-based lookups, check the documentation for Wappalyzer's and SimilarTech's paid plans, which support programmatic access.

Does Web Reveal offer an API like BuiltWith?

Yes. Web Reveal provides an API for programmatic technology lookups. Check the documentation page for the latest details on endpoints, rate limits, and authentication.

How accurate are website technology detectors compared to BuiltWith?

Accuracy varies by tool, detection method, and target website. BuiltWith maintains a large historical database built from periodic crawls, which is useful for trend analysis. Tools like Web Reveal perform live, real-time detection on demand, meaning results reflect the site's current deployed state rather than cached data. Each approach has advantages depending on your use case.

Can I use these tools commercially?

Most tools allow commercial use of technology lookups, but terms vary—especially for bulk data export and lead generation use cases. Always review each tool's terms of service before using output data commercially. For Web Reveal, see the Terms of Service and License pages.

Which tool is best for detecting CMS platforms like WordPress?

All the tools in this list detect popular CMS platforms including WordPress, Drupal, Shopify, Joomla, Wix, Squarespace, and Webflow. Web Reveal performs live CMS detection, meaning it identifies what is actually running on the site at the moment of the scan rather than relying on cached index data. This is particularly useful when a site has recently migrated platforms.

Are there any privacy-focused website technology detection tools?

Some browser extensions—including WhatRuns—perform detection primarily client-side within your browser, reducing the amount of data sent to third-party servers. Web Reveal processes scan requests server-side to enable broader detection, but does not store personally identifiable information about the sites you scan beyond what is described in the Privacy Policy.