Tool category
Browser Extension
Lightweight in-browser diagnostics — the fastest way to inspect a page without opening a crawler.
12 tools · 12 free or with a free tier · 3 more cover this area as a secondary feature
| Tool | What it does | Pricing | From | HQ |
|---|---|---|---|---|
| Ahrefs SEO Toolbar ahrefs.com | Browser extension showing on-page SEO data, redirect chains and Ahrefs link and traffic metrics for pages and search results. | Freemium | — | Singapore |
| BuiltWith builtwith.com | Technology lookup service and extension reporting the software, hosting, analytics and advertising stack used by a website, with lead list exports. | Freemium | — | Australia |
| Detailed SEO Extension detailed.com | Free browser extension that surfaces a page's titles, meta tags, headings, canonical, schema, hreflang and indexability in a single panel. | Free | — | United Kingdom |
| Link Redirect Trace linkresearchtools.com | Free extension from LinkResearchTools that traces redirect chains and reports rel attributes, HTTP headers and link status. | Free | — | Austria |
| MozBar moz.com | Moz browser extension overlaying Domain Authority, Page Authority and link metrics onto search results and web pages. | Freemium | — | United States |
| Redirect Path ayima.com | Free Chrome extension from Ayima that flags HTTP status codes and shows the full redirect chain for the current URL. | Free | — | United Kingdom |
| SEO Minion seominion.com | Free browser extension for on-page analysis, broken link checking, SERP previews and hreflang inspection. | Freemium | — | — |
| SEO Pro Extension seoproextension.com | Free Chrome extension displaying on-page SEO elements, structured data, hreflang and Search Console data for the current page. | Free | — | — |
| SEOquake seoquake.com | Free Semrush browser extension showing SEO metrics for pages and SERPs, with on-page audits, keyword density and SERP data export. | Free | — | United States |
| View Rendered Source chromewebstore.google.com | Free Chrome extension that shows the raw HTML alongside the DOM after JavaScript execution, highlighting the differences. | Free | — | — |
| Wappalyzer wappalyzer.com | Technology profiler available as a browser extension and API that identifies the CMS, frameworks, analytics and other software a site runs. | Freemium | — | United Kingdom |
| Web Vitals Chrome Extension github.com | Google's open-source Chrome extension that measures Core Web Vitals in real time for the current page and compares against field data. | Open Source | — | United States |
Also covers browser extension
These tools are catalogued under another primary category but include browser extension functionality.
Other categories
GEO AI Visibility (47)All In One (32)Crawler (17)Analytics (15)Content Optimization (15)Keyword Research (15)Page Speed (15)Rank Tracking (14)SERP API (13)Free Utility (12)Local SEO (10)Reporting (10)AI Writing (9)WordPress (9)Digital PR (8)Technical SEO (7)Backlinks (6)Schema (6)Log Analysis (5)Ecommerce SEO (4)Internal Linking (4)Enterprise (3)