Tech Stack Detector: website technology lookup in bulk, $2 per 1,000 sites

Tech Stack Detector tells you what a website is built with. Give it a list of websites and get the technologies each one uses: CMS, ecommerce platform, JavaScript framework, analytics, ad pixels, marketing automation, live chat, cookie consent, CDN, hosting, web server and more. Every detection comes with its category, the version when the site exposes it, and the evidence it was found from (a response header, meta tag, script, link, cookie name or HTML pattern).

It detects 136 technologies in 38 categories, using fingerprint rules written for this Actor. One fast HTTP page request per website (plus its robots.txt). No browser, no proxy, no login. It obeys robots.txt.

At a glance: $0.002 per website that returns a page ($2.00 per 1,000); rows for websites that could not be read are free. Pay per result with no subscription, set a maximum cost per run, export to JSON, CSV, Excel or HTML, or call it from the Apify API, n8n, Make or Zapier.

Who it's for

• Sales and lead generation teams building lists of companies that use (or do not use) a platform, such as WooCommerce stores or WordPress sites.
• Market researchers measuring technology adoption across a list of domains.
• Agencies and consultants checking a prospect's CMS, hosting and analytics before a pitch, redesign or migration.
• CRM enrichment: add the tech stack to company records through n8n, Make or Zapier.

What it detects

Category	Technologies
CMS	Drupal, Ghost, HubSpot CMS, Joomla, MediaWiki, WordPress
Headless CMS	Contentful, Sanity, Strapi
Site builder	Framer, Squarespace, Webflow, Wix
Static site generator	Astro, Docusaurus, Gatsby, Hugo, Jekyll
Ecommerce	BigCommerce, Magento, PrestaShop, Salesforce Commerce Cloud, WooCommerce
Payments	Klarna, PayPal, Stripe
JavaScript framework	Angular, AngularJS, Ember.js, Next.js, Nuxt, React, Remix, Svelte, SvelteKit, Vue.js
JavaScript library	Alpine.js, GSAP, htmx, jQuery, Lodash, Three.js
UI framework	Bootstrap, Tailwind CSS
Analytics	Adobe Analytics, Amplitude, Cloudflare Web Analytics, Fathom, Google Analytics, Heap, Hotjar, Matomo, Microsoft Clarity, Mixpanel, Plausible, PostHog, Segment, Vercel Analytics
Tag manager	Google Tag Manager
Advertising	Google AdSense, Google Ads, LinkedIn Insight Tag, Meta Pixel, TikTok Pixel, X (Twitter) Pixel
A/B testing	Optimizely, VWO
Marketing automation	HubSpot, Marketo, Pardot
Email marketing	Klaviyo, Mailchimp
Live chat	Crisp, Drift, Freshchat, Intercom, Tawk.to
Customer support	Zendesk
Cookie consent	Cookiebot, OneTrust, Osano
Forms and scheduling	Typeform, Calendly
Search	Algolia
Video	Vimeo, Wistia, YouTube embed
Font	Adobe Fonts, Font Awesome, Google Fonts
Blogging and docs	Medium, Substack, GitBook, Mintlify
CDN and cache	Akamai, Amazon CloudFront, Cloudflare, Fastly, Varnish
Hosting	Amazon Web Services, Fly.io, GitHub Pages, Google Cloud, Heroku, Kinsta, Microsoft Azure, Netlify, Render, Vercel, WP Engine
Web server	Apache, Caddy, LiteSpeed, Microsoft IIS, Nginx
Web framework	Django, Express, Laravel, Microsoft ASP.NET, Ruby on Rails
Programming language and database	Java, Node.js, PHP, MySQL
Monitoring	Datadog RUM, New Relic, Sentry
Security	Cloudflare Turnstile, hCaptcha, HSTS, reCAPTCHA
Other	HTTP/3, PWA manifest, Open Graph, Schema.org JSON-LD

Some technologies are implied by others. For example, Next.js implies React and Node.js, and WordPress implies PHP and MySQL. Implied detections say so in their evidence ("implied by Next.js").

How to use it

1. Open the Actor in Apify Console and click Try for free.
2. Paste your websites into Websites, one per line. Bare domains like nextjs.org work; https:// is added for you. Duplicates are removed.
3. Optional: turn on Include response headers to also get the response headers, or turn off Include failed URLs to skip sites that could not be read.
4. Click Start and export the dataset to CSV or Excel. Filter by technologyNames or categories to build your list.

Input

Field	Type	Default	Description
urls	array (required)	["https://www.python.org/"]	Websites to check. Each one is fetched once.
includeHeaders	boolean	false	Add the HTTP response headers to each row (cookies are left out).
includeFailedUrls	boolean	true	Also save rows for websites that could not be read (DNS errors, timeouts, HTTP 400 and above, robots.txt). These rows are free. Turn off to skip them.
maxConcurrency	integer, 1 to 30	10	How many websites to check at the same time.
maxResults	integer	0	Stop after this many rows. 0 means no limit.

Example input

{
  "urls": [
    {"url": "https://www.python.org"},
    {"url": "nextjs.org"}
  ],
  "includeHeaders": false,
  "includeFailedUrls": false
}

Output

One row per website. This is a real row from a test run:

{
  "url": "https://nextjs.org",
  "finalUrl": "https://nextjs.org",
  "statusCode": 200,
  "technologies": [
    {"name": "Vercel", "category": "Hosting", "version": null, "evidence": ["header:server", "header:x-vercel-id"]},
    {"name": "Next.js", "category": "JavaScript framework", "version": null, "evidence": ["html"]},
    {"name": "React", "category": "JavaScript framework", "version": null, "evidence": ["implied by Next.js"]},
    {"name": "Node.js", "category": "Programming language", "version": null, "evidence": ["implied by Next.js"]},
    {"name": "Open Graph", "category": "SEO", "version": null, "evidence": ["meta:og:title"]},
    {"name": "Schema.org JSON-LD", "category": "SEO", "version": null, "evidence": ["html"]},
    {"name": "HSTS", "category": "Security", "version": null, "evidence": ["header:strict-transport-security"]}
  ],
  "technologyNames": ["Vercel", "Next.js", "React", "Node.js", "Open Graph", "Schema.org JSON-LD", "HSTS"],
  "technologyCount": 7,
  "categories": {
    "Hosting": ["Vercel"],
    "JavaScript framework": ["Next.js", "React"],
    "Programming language": ["Node.js"],
    "SEO": ["Open Graph", "Schema.org JSON-LD"],
    "Security": ["HSTS"]
  },
  "error": null,
  "checkedAt": "2026-10-30T01:31:18.993408+00:00"
}

Versions appear when the site exposes them, for example {"name": "jQuery", "version": "1.8.2"} on python.org in the same test run.

Field	Description
url, finalUrl	The URL you gave and the URL after redirects
statusCode	HTTP status of the response
technologies	Each detection with name, category, version (or null) and evidence
technologyNames	Just the names, easy to filter in a spreadsheet
technologyCount	Number of technologies detected
categories	Technology names grouped by category
headers	Response headers, only with Include response headers
error	null on success; otherwise for example HTTP 403, DNS or connection error, or not fetched: robots.txt disallows it
checkedAt	When the website was fetched (UTC)

The RUN_SUMMARY record in the key-value store has the number of URLs, how many succeeded and failed, rows saved, and whether the run stopped at your cost limit.

Pricing

This Actor uses pay-per-event pricing. You pay per website, not for compute time.

Event	Price
Website checked (one row)	$0.002
Actor start (charged by Apify, once per GB of run memory; 1 event at the default 1 GB)	$0.00005

Examples:

• 100 websites: 100 × $0.002 + $0.00005 = about $0.20.
• 1,000 websites: about $2.00.
• 10,000 websites: about $20.00.

Rows for websites that could not be read (HTTP 400 and above, DNS or connection errors, timeouts, robots.txt) are free. You pay only for websites that returned a page with status below 400. Include failed URLs only decides whether those free rows are saved; they still count toward Max results.

Set a maximum cost per run. In Apify Console set Maximum cost per run, or pass maxTotalChargeUsd through the API. The Actor stops cleanly when the limit is reached and the status message says so.

Integrations and API

The Actor ID is fecklesspleb/tech-stack-detector (in API URLs: fecklesspleb~tech-stack-detector).

• n8n: use the Apify node, choose Run an Actor with this Actor ID, then read the dataset items and write the stack to your CRM or a sheet.
• Make: use the Apify module Run an Actor, then Get Dataset Items.
• Zapier: use the Apify app with Run Actor, then a dataset items step, for example when a new lead is added.
• Schedules: create an Apify schedule to re-check a list of domains every month, and a webhook to get notified when a run finishes.
• AI agents: call it through the Apify API, the Apify clients, or Apify's MCP server.

Run it with curl

curl -X POST "https://api.apify.com/v2/acts/fecklesspleb~tech-stack-detector/run-sync-get-dataset-items?token=YOUR_APIFY_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"urls": [{"url": "https://www.python.org"}, {"url": "nextjs.org"}], "includeFailedUrls": false}'

Python

from apify_client import ApifyClient

client = ApifyClient("YOUR_APIFY_TOKEN")
run = client.actor("fecklesspleb/tech-stack-detector").call(
    run_input={"urls": [{"url": "https://www.python.org"}, {"url": "nextjs.org"}]},
    max_total_charge_usd=1,
)
for row in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(row["url"], row.get("technologyNames"))

JavaScript

import { ApifyClient } from 'apify-client';

const client = new ApifyClient({ token: 'YOUR_APIFY_TOKEN' });
const run = await client.actor('fecklesspleb/tech-stack-detector').call({
    urls: [{ url: 'https://www.python.org' }, { url: 'nextjs.org' }],
});
const { items } = await client.dataset(run.defaultDatasetId).listItems();
console.log(items.filter((r) => r.technologyNames?.includes('WordPress')).map((r) => r.url));

Limits

• It checks the page at the URL you give (usually the home page), not the whole site. A tool used only on other pages is not seen.
• It reads the HTML and headers the server sends, without running JavaScript. Tools loaded only later by a tag manager may not appear.
• Sites behind bot protection may return an error row or fewer detections.
• On the Apify platform, sites whose address is private, loopback or link-local (also after a redirect) are not fetched. They get a free error row: not fetched: private, loopback and link-local addresses are not allowed.
• Detection covers the 136 technologies in its fingerprint rules, most of them listed above. Anything else is not reported.

Common searches this Actor answers

• what is this website built with
• tech stack lookup for a list of domains
• website technology lookup in bulk
• what CMS is this site using
• find WordPress or WooCommerce sites from a domain list
• detect analytics and ad pixels on a website
• website technology detector API

FAQ

How do I find out what a website is built with? Add the website to Websites and run the Actor. You get each detected technology with its category, version when visible, and the evidence it was found from.

Can I check thousands of websites at once? Yes. Paste the whole list. Each website is fetched once, up to 30 at a time, at $0.002 per website that returns a page.

Is this a Wappalyzer or BuiltWith alternative? It does the same kind of job: it detects technologies from a website's public HTML and response headers. It is not affiliated with Wappalyzer or BuiltWith and does not use their data. It uses its own fingerprint rules for 136 technologies and checks websites live; it has no historical data.

How do I find all WordPress sites (or WooCommerce stores) in a list of domains? Run the list and filter the dataset where technologyNames contains WordPress (or WooCommerce). The categories field also groups names, for example Ecommerce or CMS.

Why is a technology I know the site uses missing? It may be loaded only by JavaScript after the page opens, used on a different page, or not among the 136 technologies the Actor knows.

Does it show versions? When the site exposes a version, for example in a generator meta tag or a script file name, it is in the version field. Otherwise version is null.

Do I pay for websites that fail? No. Rows for websites that could not be read are free: HTTP 400 and above, DNS or connection errors, timeouts, and websites robots.txt disallows, directly or through a redirect. With Include failed URLs on (the default) you get these free error rows; turn it off to skip them.

Is it legal? The Actor reads public pages the same way a browser does, obeys robots.txt, never logs in, and does not store cookies or personal data. You are responsible for how you use the results.

Related Actors

• Website Metadata Extractor: titles, meta tags, Open Graph and JSON-LD for the same list of URLs.
• Website SEO Audit: crawl a site and score every page for on-page SEO.
• Broken Link Checker: find 404s and dead links on a site.
• ATS Jobs Scraper: get open jobs for a list of companies from their Greenhouse, Lever, Ashby, Workable, Recruitee and Workday career boards, a hiring signal to pair with tech stack data.