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Analyzes page performance on both mobile and desktop, offering Core Web Vitals, suggestions, and a mobile‑friendliness score.
Built‑in Chrome audit tool that evaluates mobile usability, performance, accessibility, and SEO with detailed reports.
#4 WebPageTest
Runs real‑world tests from multiple locations and devices, providing mobile waterfall charts, filmstrips, and optimization tips.
#5 GTmetrix
Free tier includes mobile analysis (via Lighthouse) with PageSpeed and YSlow scores, plus visual recommendations.
Microsoft’s counterpart to Google’s test, checking mobile rendering, viewport, and usability issues.
Simple online tool that renders your URL on several popular device screens and flags mobile‑friendliness problems.
Quick visual preview of how a site looks on a range of device sizes, helping spot layout break‑points.
Free Chrome extension that runs a mobile‑focused PageSpeed Insights audit directly from the browser.
Shows crawl‑detected mobile usability issues (e.g., clickable elements too close, content wider than screen).
#11 SEO Site Checkup
Free site audit includes a mobile‑friendliness check, page speed, and SEO health metrics.
Offers a limited‑free site audit with mobile‑friendliness analysis, on‑page SEO, and visual screenshots.
#13 SEObility
Free SEO crawler that evaluates mobile usability, broken links, and technical SEO issues.
Limited free crawl that flags mobile‑friendliness problems alongside other technical SEO issues.
Free account provides up to 100 pages per crawl, including mobile usability warnings.
30‑day free trial includes mobile‑friendliness checks, crawl errors, and SEO recommendations.
Desktop crawler (up to 500 URLs) that reports mobile‑friendly issues via the “Mobile Usability” tab.
Provides a quick mobile‑friendliness score, page speed data, and actionable SEO tips.
#19 Dareboost
Free analysis (limited daily) includes mobile performance, usability, and visual comparison screenshots.
Online tool that checks mobile responsiveness, page speed, and SEO health with a simple URL input.
Live testing platform offering free trial access to real mobile devices for manual mobile‑friendliness checks.