Why does this not detect WordPress / Webflow / [framework X]?

We rely on signals embedded in HTTP headers and HTML, not page-content fingerprinting. If a site doesn't emit a Server, X-Powered-By, or Generator header that names the technology, the field will be blank. Cloudflare-fronted sites in particular often only expose 'cloudflare' as the server.

Is this like BuiltWith or Wappalyzer?

Similar idea, different methodology. BuiltWith does deep page-content fingerprinting; Wappalyzer runs as a browser extension and detects in-page scripts. RankParse uses indexed HTTP response headers: fast, no install, but coverage is more limited to what's in the crawl headers.

How fresh is the data?

We index the web four times per year. The current dataset reflects January–March 2026. If a site recently changed stacks, the next quarterly crawl will pick it up.

Free tool

What tech stack does this website use?

Detect the server, programming language, CMS, and frameworks powering any website. We extract the signals from real HTTP response headers in our web index. No Chrome extension, no install.

About

About this tool

Background

A tech stack lookup tells you what runs under the hood of any website: which web server (nginx, Cloudflare, Apache), which language or framework (Node.js, PHP, Rails), and which CMS or static-site generator (WordPress, Hugo, Next.js). Sales teams use it to qualify leads. Engineers use it to estimate migration cost. Researchers use it to track adoption trends.

RankParse extracts the underlying signals (Server, X-Powered-By, and generator meta tags) directly from the response headers and HTML captured during our web index. This means we can detect tech for any indexed site, regardless of whether it deliberately exposes the info.

How it works

Type a domain and hit submit. We aggregate the response headers seen across every page indexed for that domain in the latest crawl, then return the most-frequent combination of Server, X-Powered-By, and Generator. The result reflects what the site is actually serving, not what it claims to use in a marketing page.

Anonymous: 5 free checks per day. Free account: 25/day. Programmatic access via the API for use cases like CRM enrichment or competitive research.

API

Need this for 1,000 domains?

The same data is available via the REST API. Pay only for what you use; credits never expire.

Get an API key

# Same data, programmatically. First 100 credits free on signup
curl "https://api.rankparse.com/v1/tech-stack?domain=example.com" \
  -H "X-API-Key: rp_your_key"

FAQ

Frequently asked questions

More checks on the free tools page.

Beyond the free tools

Want your agent to run these for you?

Connect RankParse to Claude or ChatGPT and ask in plain words. 100 free credits, no card.

Start free Add to Claude