SEOquake is a popular free browser extension that provides on‑page SEO metrics, SERP analysis, and keyword research. Below is a curated list of 20 other free SEO tools and extensions that can serve as alternatives for marketers, SEOs, and content creators.
Get targeted exposure with custom position pinning and highlighted placement.
Free Chrome/Firefox toolbar from Moz that shows domain authority, page authority, link metrics, and on‑page element analysis.
Browser extension offering Ahrefs’ backlink, organic traffic, and keyword data directly on SERPs and any webpage.
Provides traffic estimates, source breakdowns, and engagement metrics for any site right from the toolbar.
Shows search volume, CPC, and SEO difficulty for keywords on Google SERPs; integrates with the Ubersuggest dashboard.
All‑in‑one SEO assistant that checks on‑page SEO, previews SERPs, extracts links, and performs hreflang validation.
Displays keyword volume, CPC, and competition data in Google Search, YouTube, Amazon, and more.
Inspects meta tags, Open Graph, Twitter Cards, and structured data on any page, highlighting missing or duplicate elements.
Offers on‑page analysis, keyword density, header checks, and page speed insights directly from the extension.
Provides a quick SEO audit, page optimization score, and actionable recommendations.
Open‑source, automated tool for performance, accessibility, SEO, and best‑practice audits.
Shows Google PageSpeed scores, core web vitals, and optimization suggestions for the current page.
Free version delivers keyword difficulty, search volume, and SERP features overview for any query.
Provides quick keyword difficulty and volume data from the Mangools suite directly in the browser.
Detects broken links, no‑follow attributes, and anchor text distribution on the fly.
Fast link checker that highlights broken and valid links on a page, useful for on‑page SEO audits.
A lighter version of SEOquake that still offers SERP analysis, keyword density, and backlink data.
Official Google tool for performance reports, index coverage, and SEO insights; integrates with Chrome via the “Search Console” extension.
Free Chrome extension that runs a quick on‑page SEO audit, highlighting missing tags, duplicate content, and speed issues.
Desktop crawler (free up to 500 URLs) that provides in‑depth technical SEO data; can be launched from the browser via a URL handler.
Shows GA tracking hits and errors in the console, helping verify analytics implementation for SEO reporting.