Website Tech Stack Detector: a BuiltWith and Wappalyzer alternative for bulk lists

Find out what technologies any website uses: CMS (WordPress, Webflow…), e-commerce platform (Shopify, WooCommerce, Magento…), JavaScript frameworks (React, Next.js, Vue…), analytics and tag managers, advertising pixels, CDN and hosting, payment providers, marketing automation, chat widgets, and email providers from DNS (Google Workspace, Microsoft 365…).

Detection uses 7,600+ open-source technology fingerprints with version numbers and categories, run against HTTP headers, cookies, HTML, scripts, meta tags and DNS records. Paste 10 or 100,000 domains and get one clean row per website.

Quick start

1. Paste domains or URLs into URLs (one per line, any format: example.com, https://www.example.com/pricing).
2. Optionally filter for the technologies you care about (technologies + onlyMatching) to build lead lists.
3. Click Start and export to CSV/Excel/JSON, or call the Actor through the Apify API, Zapier, Make or n8n.

Use cases

• Lead generation and sales prospecting: "all Shopify stores using Klaviyo", "WordPress sites without Google Analytics"
• Competitor research: see the stack, tools and vendors of competing websites
• Market research: technology adoption across an industry list
• Agencies: qualify prospects before outreach (outdated CMS, no tracking, slow stack)

Input

{
  "urls": ["allbirds.com", "https://wordpress.org/news/", "vercel.com"],
  "checkDns": true,
  "minConfidence": 0
}

New options (v0.2)

Option	What it does
technologies + onlyMatching	Build lead lists: keep only sites using e.g. Shopify, HubSpot or Stripe (others are free)
categories	Keep only Analytics, Ecommerce, CMS, Payment, ... technologies
maxPagesPerDomain (1-5)	Also scan pricing / shop / blog pages for tools that only load there; same price per site
trackChanges, stateKey	addedTechnologies / removedTechnologies since the last run (competitor monitoring)

Versions are reported when the page exposes them (version). Not included on purpose: headless-browser rendering (keeps cost low) and any bot-protection bypass.

Output (one item per website)

{
  "url": "https://www.allbirds.com", "status": "ok", "statusCode": 200, "title": "Allbirds…",
  "technologyCount": 10,
  "technologyNames": ["Cloudflare", "Shopify", "Swiper", "Apple Pay", "PayPal", "Google Tag Manager", "…"],
  "byCategory": {"Ecommerce": ["Shopify"], "CDN": ["Cloudflare"], "Payment processors": ["Apple Pay", "PayPal"], "Tag managers": ["Google Tag Manager"]},
  "technologies": [{"name": "WordPress", "version": "7.2", "categories": ["CMS", "Blogs"], "confidence": 100, "implied": false, "website": "https://wordpress.org"}]
}

Pricing (pay per event)

Event	Price
Analyzed website (website)	$0.001 ($1 per 1,000 sites)
Actor start	$0.00005 (Apify default)

• Failed or unreachable websites are free; with onlyMatching, sites that don't match are free too.
• Scanning extra pages per domain (maxPagesPerDomain) does not change the price.
• Examples: 1,000 domains ≈ $1; 50,000 domains ≈ $50.
• Set Maximum cost per run to cap spend; the Actor stops cleanly at the cap.

How it works and its limits

• One HTTP request per website plus DNS lookups. No headless browser, so it is fast and cheap.
• Technologies that only appear after JavaScript runs (some single-page-app tools) may be missed. Server-side, HTML, script and DNS-based detections are covered.
• robots.txt is respected by default. No captcha or anti-bot bypass.
• Fingerprints: webappanalyzer (GPL-3.0), an open-source fork of the Wappalyzer rules. Not affiliated with Wappalyzer or BuiltWith.

FAQ

Is this the same as Wappalyzer or BuiltWith? It uses an open-source fork of the Wappalyzer fingerprints, run live against each site. BuiltWith also has historical data; this Actor reports what the site uses right now (plus changes since your last run with trackChanges).

Why is a technology missing? It may only load after JavaScript runs, after login, or on a page not scanned. Try maxPagesPerDomain: 3.

Do I need proxies? No. Sites behind aggressive bot protection may return an error row (free).

Can I monitor competitors? Yes: schedule the Actor with trackChanges: true and a fixed stateKey to get addedTechnologies / removedTechnologies on every run.