The best free SEO Chrome extensions for analysis, content, and outreach

Executive overview

Most SEO tools cost money, but a focused set of free Chrome extensions can cover the three core workflows: analysis, content creation, and link building. Each extension targets a specific gap — surfacing competitor data, improving content alignment, or finding the right outreach contact.

Free tools can replace paid workflows when chosen by function, not by brand familiarity.

SEO analysis extensions

• SEO Quake (by Semrush): overlays metrics — index pages, Alexa rank, keyword difficulty — directly on Google search results; also shows meta tags, link reports, and traffic analytics on any page.
• Meta SEO Inspector: reveals hidden metadata (tags, canonicals, structured data) and flags issues that violate Google's webmaster guidelines, including core web vitals.
• Keyword Surfer: shows search volume, CPC, and related terms inside Google without leaving the results page; lets you build and export keyword collections as CSV.
• SEO Search Simulator: simulates unbiased searches from any geographic location, showing how a page ranks in international SERPs.

Content creation extensions

• SEO Writing Assistant (Semrush Google Docs add-on): real-time feedback on tone, readability, plagiarism, and keyword integration while writing in Google Docs.
• Text Optimizer: extracts intent tables from search engine results using neural network technology; scores existing content and suggests topics to better match searcher intent.
• AIPRM: integrates with ChatGPT and provides 3,600+ one-click professional prompts for tasks like blog titles and email responses; supports shared team prompt lists.

Link building extensions

• Hunter.io: finds all email addresses associated with a domain in one click; shows email patterns, department filters, source citations, and a confidence/verification score per address; also identifies author contact details from articles.
• Harpa AI: on any page, runs summary, keyword extraction, or content prompt tools; also summarises YouTube video transcripts to support guest post research.