Yellow Lab Tools is a free, open-source web performance and front-end quality auditing tool for developers and site owners. It analyzes page speed, JavaScript, CSS, DOM complexity, and common implementation issues through a web interface or self-hosted Node.js service.
💡 Pick it for broader performance, accessibility, SEO, and best-practice audits with strong Chrome integration.
Lighthouse is an open-source, automated tool for improving the quality of web pages. It has audits for performance, accessibility, progressive web apps,...
💡 Pick it for a fast hosted audit that combines Lighthouse findings with real-user Core Web Vitals data.
PageSpeed Insights analyzes the content of a web page, then generates suggestions to make that page faster.
💡 Pick it when you need configurable locations, detailed waterfalls, and visual loading evidence.
WebPageTest is an open-source tool for testing and analyzing the performance of web pages.
💡 Pick it for polished reports, visual timelines, and ongoing monitoring across client or production sites.
GTmetrix is a tool that analyzes your website's speed performance and provides actionable recommendations.
Starting at $14.95/month
sitespeed.io contributors
💡 Pick it for open-source, repeatable performance testing in CI and long-term metric tracking.
sitespeed.io is an open-source command-line toolkit for automated website performance testing and monitoring. It runs browser-based tests with engines such as Browsertime...
Free, open source
💡 Pick it for managed continuous monitoring, performance budgets, and regression alerts for production sites.
DareBoost is a web performance monitoring and optimization tool that helps in analyzing website speed, SEO, and quality.
Starting at $25/month
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