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Google’s official tool for monitoring indexing status, crawl errors, mobile usability, and core web vitals.
Free suite offering site crawl reports, SEO analysis, keyword research, and performance insights for Bing.
Desktop crawler that scans up to 500 URLs, providing data on broken links, redirects, duplicate content, and metadata.
Free dashboard for site health checks, backlink analysis, and keyword rankings, limited to verified sites.
Limited‑access audit that identifies crawlability issues, HTTPS problems, and on‑page SEO gaps.
Provides a site crawl, keyword explorer (10 queries/month), and page optimization suggestions.
Offers site audit reports, keyword ideas, and backlink data with a daily limit of 3 audits.
Online scanner that evaluates SEO, speed, mobile friendliness, and security with up to 5 free checks per day.
Free tool that audits on‑page SEO, page speed, and backlink profile, delivering a score and actionable tips.
#11 GTmetrix
Performance testing platform that measures page load speed, provides waterfall charts, and suggests optimizations.
#12 WebPageTest
Open‑source tool for detailed performance testing across browsers, locations, and connection speeds.
Built‑in Chrome audit that evaluates performance, accessibility, best practices, SEO, and PWA compliance.
#14 Seobility
Free website auditor that checks for broken links, duplicate content, meta tags, and internal linking issues.
Desktop suite offering Rank Tracker, WebSite Auditor, LinkAssistant, and SEO SpyGlass with limited project capacity.
Crawl tool that visualises technical SEO issues with heat‑maps and actionable recommendations (30‑day trial).
Provides a one‑page SEO audit covering site health, mobile, and social metrics with a limited number of free checks.
#18 Lighthouse CI
Open‑source CI integration for automated Lighthouse audits, enabling continuous performance and SEO monitoring.
Browser extension that displays on‑page SEO metrics, broken links, and backlink data while browsing.
Shows page authority, domain authority, and on‑page elements directly in the SERP.
Provides instant SEO metrics, internal/external link analysis, and keyword density on any page.
#22 Siteliner
Analyzes duplicate content, broken links, page depth, and internal linking for free (up to 250 pages).
Creates XML sitemaps and validates existing ones, highlighting errors and missing URLs.
Simple online tool to create and test robots.txt files for proper crawl directives.
Analyzes page performance and provides specific recommendations for speed and SEO improvements.
#26 BROWSEO
Free Chrome extension that strips away visual clutter to reveal the page’s underlying HTML and SEO elements.
Creates JSON‑LD schema snippets for articles, products, events, and more, with validation.
Evaluates whether a page is optimized for mobile devices and highlights usability issues.
Shows HTTP status codes, redirects, and chain information directly in the browser address bar.
Identifies broken outbound links on a page and provides quick export options.
Offers a limited free crawl that surfaces technical SEO errors, speed issues, and mobile problems.
#32 Varvy SEO Tool
Free audit covering core web vitals, mobile friendliness, structured data, and indexability.
Enterprise‑grade crawler with a 14‑day free trial, delivering detailed technical SEO reports.
Windows desktop crawler that generates XML sitemaps and identifies SEO issues without URL limits.
Online tool that checks for broken links, duplicate content, meta tags, and page speed.