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Open‑source performance audit built into Chrome; offers metrics for speed, accessibility, SEO, and best practices.
#3 WebPageTest
Free online service that runs detailed speed tests from multiple locations and browsers, delivering waterfall charts and filmstrips.
#4 GTmetrix
Combines Google PageSpeed and YSlow scores; provides recommendations, video playback, and historical tracking on its free tier.
Free tool that measures load time, page size, and request count, with easy‑to‑read performance grades.
#6 Dareboost
Free analysis (limited to 5 tests per month) delivering performance scores, SEO checks, and actionable improvement tips.
Open‑source web performance analyzer that highlights JavaScript, CSS, and rendering issues with visual reports.
Free online speed test from multiple global checkpoints, offering waterfall view and performance grades.
#9 SiteSpeed.io
Open‑source CLI tool that runs Lighthouse, WebPageTest, and custom audits to generate detailed performance reports.
#10 Varvy SEO Tool
Free website analyzer focusing on SEO, mobile‑friendliness, and page‑speed recommendations.
Provides a quick page‑speed score, core web vitals, and suggestions for improvement without registration.
Free SEO audit tool that includes page‑speed analysis, broken‑link checks, and on‑page optimization tips.
Free webmaster suite offering site health reports, including performance metrics and Core Web Vitals.
Limited‑free crawl that flags performance issues, large files, and slow‑loading resources.
Desktop crawler (up to 500 URLs) that reports page‑size, load time, and identifies large assets.
Provides aggregated page‑speed data (LCP, FID, CLS) directly from real user metrics.
#17 Lighthouse CI
Open‑source CI tool that runs Lighthouse audits on every build, tracking performance trends over time.
#18 PerfTool
Free online analyzer that measures page load time, size, and gives optimization suggestions.
Runs a single‑page test from multiple locations, delivering waterfall charts and performance grades.
#20 Nibbler
Free website analysis tool covering performance, accessibility, SEO, and best practices with a simple score.
#21 Web.dev Measure
Google’s web.dev tool that runs a Lighthouse audit and presents results with clear improvement steps.