How to use
01
Enter a URL
Paste a homepage or any page address into One website, or up to 20 addresses into the Bulk tab. The homepage usually carries the most signals, because it loads the main scripts and tags.
02
Click Detect stack
The tool fetches the HTML, the response headers and the DNS records, then tests every signature. In bulk, sites are checked one after another with a progress bar and a Stop button.
03
Read and export the results
Results are grouped by category with a version, a confidence badge and the evidence behind each match. Copy the list, or download CSV or JSON; bulk results show a comparison table.
Why Tech Stack Detector
- About 230 technologies in 40+ categories, with versions where exposed.
- Reads HTML, headers, cookies and DNS, and shows the evidence for each match.
- WordPress theme and plugin folders, linked to wordpress.org.
- Up to 20 sites at once, with CSV and JSON export.
What the tech stack detector checks
Each technology has its own set of markers, such as a script address, a folder path, a meta tag, a header, a cookie name or a DNS record. The table lists the main groups with a few examples of each.
| Group | Examples |
|---|---|
| CMS, ecommerce and page builders | WordPress, Shopify, Wix, Squarespace, Webflow, Drupal, Magento, WooCommerce, Elementor, Divi |
| Frameworks and libraries | Next.js, Nuxt, Astro, React, Vue, Angular, Svelte, jQuery, GSAP, Tailwind CSS, Bootstrap |
| Analytics and advertising | Google Analytics, Tag Manager, Hotjar, Clarity, Matomo, Meta Pixel, Google Ads, TikTok Pixel |
| Marketing, CRM and chat | HubSpot, Mailchimp, Klaviyo, Intercom, Zendesk, Tawk.to, Crisp, Trustpilot, Calendly |
| Hosting, CDN and servers | Cloudflare, CloudFront, Fastly, Vercel, Netlify, WP Engine, Nginx, Apache, LiteSpeed |
| Email and DNS | Google Workspace, Microsoft 365, Zoho Mail, SendGrid, Mailgun, Cloudflare DNS, GoDaddy DNS |
| Payments, consent and security | Stripe, PayPal, Razorpay, Klarna, Cookiebot, OneTrust, reCAPTCHA, HSTS |
Reading the evidence
Open any result to see why it was matched. The evidence type tells you how much to trust it.
- header or cookie: sent by the server itself, so it is hard to fake by accident.
- meta: a generator tag that the platform writes into the page.
- dns: an MX, TXT or NS record for the domain, used for email and DNS providers.
- script: the address of a file the page loads, such as a CDN or tag URL.
- html: a pattern in the page source. It can also appear in an article that only mentions the tool, so treat single html matches as leads.
- implied: not seen directly, but required by something that was.
Common questions
How reliable are the tech stack confidence badges?
High means two or more signals matched, or one strong signal such as a response header, a generator meta tag, a cookie or a DNS record. Medium means one pattern in the HTML or a script address matched, which is where false positives happen. Implied means the technology was not seen but is used by one that was, such as PHP under WordPress.
Can the website technology checker tell if a site uses WordPress or Shopify?
Yes, CMS detection is the most dependable part. WordPress exposes wp-content paths and a generator tag, Shopify loads files from cdn.shopify.com and sends its own headers, and Webflow adds data-wf attributes. Wix, Squarespace, Ghost, Drupal, Joomla, Magento and others have similar markers.
How do I find which WordPress theme and plugins a site uses?
Run the site through the checker. WordPress loads theme and plugin files from /wp-content/themes/ and /wp-content/plugins/, and the tool lists every folder name it finds there, linked to wordpress.org. Plugins that load no files on that page do not show up, so try a product or blog page as well.
Does the technology checker read HTTP headers, cookies and DNS?
Yes. It reads the response headers, including server, x-powered-by and CDN headers, the cookie names the server sets, and the domain's MX, TXT and NS records. That is how it finds the web server, CDN, hosting, email provider and email marketing tools that leave no trace in the HTML.
Does the tech stack detector show version numbers?
Where the site exposes them. WordPress and other generators often print a version in a meta tag, jQuery and Bootstrap often carry it in the file name or a ver parameter, and some servers include it in the server or x-powered-by header. Many sites hide versions, so a blank version is normal.
Can I check the tech stack of many websites at once?
Yes. Paste up to 20 addresses into the Bulk tab. Each site is checked in turn, a table compares the CMS, framework, hosting, analytics and email of each one, and Export CSV writes one row per technology with its category, version, confidence and evidence.
Why might a tech stack scan come back empty?
Some sites block automated requests, and the tool then shows the error it received. Custom-built sites may also leave none of the known markers. An empty result means no known signature matched, not that the site runs nothing.
Is the tech stack detector a replacement for Wappalyzer or BuiltWith?
For a quick answer about one site or a short list, often yes: it covers the common platforms and tools and shows its evidence. Those services track thousands more technologies, keep history and offer lead lists, which this free tool does not.
Does the tech stack check run any code on the target site?
No. It downloads the page HTML once, asks for the response headers and looks up public DNS records. Nothing runs on the target site and no account is needed.
What can a sales team learn from a prospect's tech stack?
The CMS hints at the kind of project: WordPress means themes and plugins, Shopify means an online store. Email hosting shows Google Workspace or Microsoft 365, ad pixels show where they advertise, and Stripe or PayPal point to a business that takes payments online.