MozBar is a popular Chrome/Firefox extension that shows page authority, domain authority, backlinks, and on‑page SEO metrics. Below is a curated list of 20 free SEO tools and browser extensions that provide similar insights without a paid subscription.
Get targeted exposure with custom position pinning and highlighted placement.
Free browser extension (Chrome, Firefox, Opera) offering page and domain metrics, keyword density, internal/external link analysis, and SERP overlay.
Free Chrome/Firefox toolbar that displays URL rating, domain rating, backlinks, organic traffic, and on‑page SEO suggestions.
Free Chrome extension from Neil Patel that shows search volume, CPC, SEO difficulty, and top SERP results for any keyword.
Lightweight Chrome/Firefox add‑on for on‑page SEO analysis, SERP preview, broken link checking, and keyword extraction.
Browser extension that displays search volume, CPC, and competition data for keywords on Google, YouTube, Amazon, and more (free for limited queries).
Open‑source, built‑in Chrome DevTools audit tool that evaluates SEO, performance, accessibility, and best practices for any page.
Provides a quick SEO audit, page analysis, and on‑page recommendations directly from the browser.
Shows domain authority, backlinks, organic keywords, and on‑page SEO data for any visited site.
Offers traffic insights, top referring sites, and audience geography for any website in a simple overlay.
Provides quick domain authority, page authority, and keyword difficulty scores via a lightweight browser toolbar.
Free Chrome extension that displays meta tags, header tags, image alt attributes, and page speed metrics.
Analyzes meta information, Open Graph tags, structured data, and page indexing status directly in the browser.
Chrome extension that reveals broken and live backlinks, link equity, and anchor text for the current page.
Free toolbar that provides keyword rankings, SERP features, and on‑page SEO scores for the active URL.
While not a toolbar, MozCast offers a free, real‑time view of Google algorithm changes and SERP volatility.
Built‑in Chrome tool (via the GSC web UI) that provides indexing status, coverage issues, and mobile usability for any URL.
Free Chrome extension that runs a quick on‑page SEO audit, checking headings, images, keywords, and page speed.
Provides a snapshot of technical SEO health—crawl errors, redirects, and duplicate content—for the visited page.
Free extension delivering page rank, domain authority, backlink count, and keyword density analysis.
Browser‑based free tool that validates structured data (JSON‑LD, Microdata, RDFa) on any page.