ReniflerRenifler
Enhanced by AI

Explore what powers the web& uncover the data behind any website

From curiosity to company intelligence, Renifler shows you what any website is built with, enriches it with company data, and delivers a fast, modern builtwith-style technology lookup.

Trusted by developers analyzing the modern web

1M+
Websites scanned
15M+
Technologies detected
15,000+
Tech fingerprints indexed
30+
Countries with live scanning

Understanding a website's tech stack shouldn't take hours

The old way

  • Manual source inspection
  • Guessing frameworks & tools
  • No insight into DNS or hosting
  • Stale BuiltWith-style databases

The Renifler way

Real-time website scanning combining:

  • DOM inspection
  • DNS fingerprinting
  • HTTP header analysis
  • Asset detection

Detect technologies used on any website

Frameworks

React, Vue, Next.js, Angular

CMS & Builders

WordPress, Shopify, Webflow

Analytics

GA4, Segment, Hotjar

Payments

Stripe, Adyen, PayPal

Infrastructure

AWS, Cloudflare, Vercel, Netlify

DNS & SSL

DNS zones, Certificates, Security

Marketing

CRMs, Tag managers, Widgets

Built for teams who need accurate technology intelligence

Developers

Audit competitor stacks before collaboration. Understand the technologies behind any website in seconds.

Growth & Sales

Generate qualified leads from technologies. Target companies using specific tools and platforms.

Investors & M&A

Technical due diligence and analysis. Understand the tech maturity of potential investments.

Agencies

Benchmark and propose better stacks. Show clients exactly how competitors are built.

What early adopters are saying

“We use Renifler before every outbound campaign to filter prospects by their tech stack. It's faster than manually checking each site and the data is actually fresh.”

— Growth Lead at SaaS startup

“When evaluating acquisition targets, we need to understand their infrastructure quickly. Renifler gives us a technical snapshot in seconds instead of hours of manual research.”

— CTO at e-commerce company

“Our team uses Renifler to benchmark competitor stacks before pitching website rebuilds. Clients appreciate when we show them exactly what their competitors are running.”

— Founder at digital agency

Generate leads based on website technologies

Filter by technology

Filter companies by frameworks, CMS, hosting or analytics tools

Geo & Industry targeting

Combine geography & industry targeting for precise results

Export leads

Export enriched lead lists with company data

Track changes

Track historical stack changes over time

Try Lead Generation
Technology: React, Next.js
Location: United States, France
Industry: SaaS, E-commerce
Results2,847 companies
A
acme-corp.com
T
techstart.io
G
growthlab.co

Real use cases

How teams use Renifler to solve real business problems

Technology-driven outbound

Context: A 12-person B2B SaaS startup selling a Shopify integration.
Problem: The sales team was manually checking websites to find Shopify stores, wasting hours on unqualified leads.
Solution: Used Renifler to filter companies by e-commerce platform and identify Shopify users in target markets.
Result: 340+ qualified leads in 2 days. Outbound reply rate improved from 2% to 5%.

Competitive stack analysis

Context: A digital product agency specializing in React and Next.js development.
Problem: Before pitching redesigns, the team had no efficient way to audit a prospect's current technology choices.
Solution: Integrated Renifler scans into their pre-sales workflow to generate technical reports for each prospect.
Result: 70% reduction in research time. Closed 3 additional projects in Q1.

Infrastructure due diligence

Context: A small investment fund evaluating early-stage SaaS companies.
Problem: Technical due diligence required manual inspection of each portfolio candidate's stack.
Solution: Used Renifler to scan candidate websites and benchmark infrastructure maturity across 15+ companies.
Result: Full pipeline screened in under a week. Identified 2 red flags that influenced deal terms.

A better BuiltWith alternative

Feature
Renifler
Others
Live DOM detection
DNS & SSL fingerprinting
Real-time scan results
Technology history
Company enrichment data
API access

Website technology stack detection made simple

Renifler is a website technology stack checker built to reveal the full technology footprint behind any website. Combining real-time DOM inspection, DNS analysis, HTTP header fingerprinting and asset scanning, Renifler identifies frameworks, CMS platforms, analytics tools, hosting providers, CDNs and payment systems used on websites across the web.

Unlike legacy website technology lookup tools relying on static databases, Renifler scans websites live to ensure accuracy. Designed for developers, sales teams and investors who need reliable technology intelligence for competitive analysis, lead generation and market research.

Renifler is a modern BuiltWith alternative focused on accuracy, speed and data enrichment.

Free website technology tools

DNS Checker

SSL Checker

CMS Detector

JS Framework Detector

CDN Detector

Frequently Asked Questions

Scan a website technology stack now

Start free — no credit card required

Renifler: AI Website Tech Stack & Company Intelligence