Check any website's technology instantly — CMS platforms, JavaScript frameworks, Ecommerce systems, analytics & more. Then find and target companies by the tech stack they use.
Explore Our Database of 17.5 Million Websites
Browse websites by the technologies they use
What TechPeeker Does
From a single URL lookup to bulk enrichment of thousands of domains — one platform for all your tech intelligence.
Enter any URL and get a full breakdown — frameworks, CMS, payment processors, CDNs, analytics tools, and more. Results in seconds.
Build targeted lists of websites filtered by the exact technologies they use. Find every Shopify store, every HubSpot customer.
Upload a CSV of domains and enrich every row with tech stack data and contact emails. Download the results instantly — ready for your CRM, Clay table, or outreach tool.
Tech Stack Checker
TechPeeker is a free website technology checker and tech stack analyzer. Paste a URL and our stack detector shows you exactly what the site is built with — no extension or signup required.
Type any domain into the tech stack checker at the top of this page.
Our tech stack detector analyzes the HTML, scripts, headers and cookies to fingerprint every technology.
Get a categorized list of the CMS, frameworks, analytics, payments, hosting and marketing tools in use.
What our technology checker detects
Use Cases
From prospecting new customers to vetting a deal, tech stack data turns into a workflow.
Build targeted prospect lists by tech stack — every Shopify store running Klaviyo, every WordPress site without a CRM, filtered exactly the way your ICP is defined.
Track what competitors and their customers are adopting, spot platform migrations early, and benchmark your stack against the market.
Pipe tech detection straight into your CRM, Clay table, or internal tools with the TechPeeker API — enrich records at scale without manual lookups.
Bulk Lookup
Upload a CSV of domains — TechPeeker detects the tech stack and finds contact emails for every row automatically.
Developer API
The TechPeeker API is live and ready to use. Detect tech stacks programmatically at scale.
Get API Access$ curl -X POST \
https://api.techpeeker.com/v1/detect \
-H "X-API-Key: tp_live_••••••••" \
-d '{"url": "shopify.com"}'
// 200 OK · 312ms
{
"url": "https://shopify.com",
"detected": ["Shopify", "Ruby on Rails", "AWS"],
"emails": ["[email protected]"]
}
Get qualified leads filtered by technology. Access websites using Shopify, React, WordPress, and more. Perfect for sales teams and marketers.