HTTP Observatory is described as 'Developed by Mozilla, the HTTP Observatory performs an in-depth assessment of a site’s HTTP headers and other key security configurations' and is a Website Audit tool in the security & privacy category. There are more than 25 alternatives to HTTP Observatory for a variety of platforms, including Web-based, Self-Hosted, Google Chrome, SaaS and Linux apps. The best HTTP Observatory alternative is Web Check, which is both free and Open Source. Other great apps like HTTP Observatory are SiteOne Crawler, Google Lighthouse, SpiderFoot and Blacklight Privacy Inspector.
Get an insight into the inner-workings of a given website: uncover potential attack vectors, analyse server architecture, view security configurations, and learn what technologies a site is using.
United Kingdom
A free in-depth website analyzer providing audits of security, performance, SEO, accessibility and other technical aspects. Available as a desktop application for Windows/macOS/Linux and as a CLI tool for advanced users and CI/CD processes. It also includes an offline web page exporter.
Czechia
EU
Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more.
United States
Automates open source intelligence by collecting, analyzing, and correlating data from diverse sources, offering web and command-line interfaces, modular plugins, detailed reports, data export, platform flexibility, and support for advanced integrations.
MaltaEU
Who is peeking over your shoulder while you work, watch videos, learn, explore, and shop on the internet? Enter the address of any website, and Blacklight will scan it and reveal the specific user-tracking technologies on the site—and who’s getting your data.
United States
Explore the complete technology stack behind websites, offering insights into frameworks, services, and server software for competitive analysis, tech market insight, and marketing strategies.
Australia
urlscan.io is a free service to scan and analyse websites. When a URL is submitted to urlscan.io, an automated process will browse to the URL like a regular user and record the activity that this page navigation creates.
GermanyEU
OSINT tool is a browser extension and web application built for researchers, investigators, journalists and intelligence analysts. Our extension gives you access to a suite of OSINT utilities directly on any webpage you visit.
South Africa
PageSpeed Insights (PSI) reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.
United States
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.
Run a free website speed test from around the globe using real browsers at consumer connection speeds with detailed optimization recommendations.
United States
This free online service performs a deep analysis of the configuration of any SSL web server on the public Internet. Please note that the information you submit here is used only to provide you the service. We don't use the domain names or the test results, and we never will.
United States
