Website technology checker
& tech stack lookup.

TechnologyChecker.io is a technology intelligence platform built for B2B sales, GTM, and market analysis teams. We provide real-time subscriber and churn signals, 20-year historical data for ICP analysis (recent years from our own crawls, prior years rebuilt from public web archives — see the methodology page), and verified decision-maker contacts across 40,000+ technologies and 29.9M live business domains — including backend and standalone platforms that frontend-only tools miss.

Our platform uses multiple detection methods including HTTP header analysis, JavaScript fingerprinting, HTML parsing, and DNS lookups to accurately identify technologies used by any website.

Yes. Looking up a domain in the search box on the homepage is free and doesn't need an account. The Free plan adds 100 credits a month with no credit card, for exports and API calls, and the Chrome extension is free to install. Paid plans start at $89 a month for 10,000 credits.

Seven key differences: (1) Full-stack detection — we detect backend tools like n8n, databases, and standalone platforms like Airtable that Wappalyzer can't see. (2) 40,000+ technologies vs ~8,000. (3) Real-time subscriber & churn signals — know the moment companies adopt or drop any technology. (4) Verified contacts included at $89/month — Wappalyzer requires their $450/month plan. (5) Company + contact data per technology with custom audience exports. (6) 20-year historical data for ICP analysis and churn prediction (recent years from our own crawls, prior years rebuilt year-by-year from public web archives like Common Crawl — methodology is published). (7) Enterprise API, bulk enrichment, and CRM automation — not just a browser extension.

We achieve high accuracy through multi-signal detection combining headless JavaScript rendering, HTTP header analysis, DNS/TLS fingerprinting, library signatures, and infrastructure probing. Our system detects 40,000+ technologies including backend tools and standalone SaaS products. Every detection includes a confidence score, and we continuously validate results across 29.9M live business domains.

We detect 40,000+ technologies including CMS platforms, ecommerce solutions, analytics tools, marketing automation, CDNs, payment processors, frameworks, programming languages, and hosting providers.

Yes — our historical technology timelines reach back roughly 20 years. The recent ~2 years come from our own snapshotted crawls; the prior ~18 years are rebuilt by analyzing petabytes of Common Crawl archives (back to 2008), Internet Archive / Wayback Machine snapshots for earlier coverage, and data from third-party archive partners. We re-run our current detection fingerprints against those records year-by-year, so you get adoption and churn data per domain across the full timeline — not a smoothed average. Methodology is on our /methodology page.

Absolutely. We only analyze publicly accessible website data and signatures. We never access private information and maintain full compliance with GDPR, CCPA, and other privacy regulations.

Sales teams use our platform to identify prospects using specific technologies, track competitor customers, receive alerts when companies switch tools, and access verified contact data for outreach.

Marketing teams leverage TechnologyChecker for competitive analysis, market sizing, identifying integration partners, tracking industry adoption trends, and building targeted prospect lists.

Five primary channels: live web crawling with real browser rendering across 29.9M live business domains, passive DNS monitoring that detects infrastructure changes within 15 minutes, TLS certificate transparency logs, historical Common Crawl archives going back to 2008, and third-party data partners. High-traffic domains refresh every 24–72 hours. Every detection carries a confidence score so you know exactly how reliable each signal is.

We detect technologies through public-facing signals including DNS records, HTTP headers, TLS certificates, API fingerprints, and code signatures. While purely internal tools with no external-facing components aren't detectable, we identify many backend and standalone platforms — like n8n, Airtable, and databases — through their public infrastructure signatures.