sonobe / website-diagnostic-tools
Online tools that check website performance, accessibility, security, etc
Items
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CSP Evaluator
(csp-evaluator.withgoogle.com)
Added 2 months ago
Check if a Content Security Policy (CSP) serves as a strong mitigation against cross-site scripting attacks.
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Analyse HTTP response headers
(securityheaders.com)
Added 2 months ago
Quickly and easily assess the security of your HTTP response headers
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Added 2 months ago
This page lists W3C validators and web developer tools. Checkers for HTML, CSS, links, RSS, etc.
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SSL Server Test (Powered by Qualys SSL Labs)
(ssllabs.com)
Added 2 months ago
A comprehensive free SSL test for your public web servers.
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Yellow Lab Tools - Page Speed audit
(yellowlab.tools)
Added 2 months ago
A free online web performance analyzer. It audits a webpage for performance and front-end quality issues. And it's open-source!
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PageSpeed Insights | Google
(pagespeed.web.dev)
Added 2 months ago
Make your web pages fast on all devices
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Web Check
(web-check.xyz)
Added 2 months ago
Over 30 checks: Server location, headers, SSL, DNS, WHOIS, Ports, HTTP, etc https://github.com/lissy93/web-check
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WebPageTest - Website Performance and Optimization Test
(webpagetest.org)
Added 2 months ago
Run a free website speed test from around the globe using real browsers at consumer connection speeds with detailed optimization recommendations.
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The W3C Markup Validation Service
(validator.w3.org)
Added 2 months ago
W3C's easy-to-use markup validation service, based on SGML and XML parsers.
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Website Speed Test | Pingdom Tools
(tools.pingdom.com)
Added 2 months ago
Use this free Website Speed Test to analyze the load speed of your websites, and learn how to make them faster.
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Collection timeline
Created: April 29, 2025 Updated: May 1, 2025
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