One of the most popular alternatives to BuiltWith is Wappalyzer, which has a free version. Other popular alternatives are Blacklight Privacy Inspector, urlscan.io, WhatRuns and Similar Tech. You're spoiled for choice with Technology Identifiers like BuiltWith: we list more than 25 alternatives for the web, self-hosting, Android, Chrome OS and Mac.
StackScope tracks the technology behind newly launched products. It continuously ingests launches from Product Hunt, Hacker News, PeerPush, and the wider web then fingerprints each site's frameworks, hosting, CDN, DNS, analytics, security headers and AI-builder signals.
RenderDiff compares the initial HTML source code of any webpage with its JavaScript-rendered DOM - and highlights every SEO-relevant difference.
Germany
EU
API suite for website intelligence: tech stack detection (Wappalyzer fingerprinting + DNS + TLS + HTTP headers), SSL/TLS certificate inspection, DNS intelligence with provider enrichment, security header analysis with letter grading, and technology change monitoring.
Turn raw tech stack data into a fully automated prospecting pipeline. Identify and target companies based on the specific technologies they use — from CRMs and analytics tools to infrastructure and dev frameworks — so you can reach the right buyers at exactly the right moment.
Prafero is an all-in-one website intelligence platform for auditing any site in one place. It analyzes SEO, performance, security, DNS, and tech stack signals, then turns them into clear insights so founders, marketers, developers, and agencies can make faster website decisions.
A web technology identification service built on a high performance WASM module to provide faster and broader detection capabilities.
United States
BeaverCheck is a free website audit tool that runs 100+ checks across performance, SEO, security, accessibility, and compliance on any URL.
PluginView is a hosted website-technology detection service. A user submits a public URL, and the service compares signals from the page against a proprietary fingerprint database to identify technologies such as ecommerce platforms, analytics tools, payment systems, chat...
TheirStack is the largest job posting and technographics database, empowering sales teams to uncover opportunities through real-time technographic and hiring signals. We process over 235k jobs per day from 104k sources and track 32k technologies across 9.9M companies.
United States
At Nikto Online Scanner, we are dedicated to providing a comprehensive solution for assessing the security of web servers. Our platform offers a powerful tool that conducts extensive tests to identify potential vulnerabilities, misconfigurations, and security risks associated...
United Kingdom
