A Chrome Extension Built for Today's SEO & GEO Analysis

Get passage-level similarity scores and document-level relevance scores powered by Google Gemini embeddings. Free to start. Built by SEOs, for SEOs.

See how ChatGPT, Google AI Overviews, and other AI systems understand your content—powered by Google Gemini embeddings.

Add to Chrome - Free

"Built for SEOs who need semantic insights, fast. Start free, upgrade as you grow."
— Go Fish Digital Team

Similarity Extension analyzing SEO content with semantic scoring

Built by SEOs, for the AI search era

AI search engines like ChatGPT, Perplexity, and Google AI Overviews don't just match keywords—they understand semantic meaning. Similarity uses Google Gemini embeddings to provide two types of scores: Passage Similarity (identify which content to edit) and Document Relevance (overall page relevance for reporting).

Free to Start

20 pages/month free. Upgrade for more capacity.

Regular Updates

Constantly improving with new features in 2025.

How It Works

Optimize for AI search in 4 simple steps

STEP 1

Get Passage Similarity & Document Relevance Scores

Enter your target keyword and instantly see how AI systems understand your page. Our Chrome extension provides two complementary scores: Passage Similarity (0-10 scale) shows which content passages align with your keyword, while Document Relevance (0-10 scale) measures overall page relevance for reporting.

Powered by Google Gemini embeddings
Passage-level similarity scores (identify what to edit)
Document-level relevance scores (track overall performance)

Similarity extension showing AI semantic similarity scores for GEO

Extension highlighting content passages with AI similarity scores

STEP 2

See Passage Similarity Scores on Every Content Block

Every passage on your page gets a color-coded Passage Similarity score (0-10). High scores (green, 8.0+) mean that content strongly aligns with your keyword semantically. Low scores (yellow/red, below 7.0) reveal specific opportunities to strengthen semantic relevance for better AI visibility.

Passage-level similarity scoring (semantic alignment)
Color-coded badges on live pages (red/yellow/green)
Click badges to test text improvements

STEP 3

Test Content Variations & See Passage Similarity Changes

Click any passage badge to open the improvement modal. Experiment with different wording and instantly see how it impacts your Passage Similarity score. Perfect your content for maximum AI visibility before making changes to your live site. All improvements use the same semantic similarity scoring system as the passage badges.

Real-time Passage Similarity scoring as you edit
Compare before & after passage scores
Save improvements to track Document Relevance changes

Text improvement modal showing AI semantic score improvements for GEO

Dashboard showing semantic similarity scores across pages

STEP 4

Track Document Relevance & Passage Improvements

Monitor your Document Relevance scores (overall page relevance) across your entire site. When you save passage improvements to reports, see how your Document Relevance score changes from before to after. Track keyword performance and measure your progress optimizing for AI search engines.

Document Relevance scores stored for every page analyzed
Track Document Relevance before & after saved improvements
Organize Passage Similarity improvements in reports

Built for the AI Search Era

Everything you need for SEO and Generative Engine Optimization

GEO-Ready Analysis

Understand how AI systems like ChatGPT, Perplexity, and Google AI Overviews interpret your content. Optimize for the generative engines that are reshaping search.

Gemini AI Powered

Uses Google's Gemini embedding model—the same technology powering modern AI search. Get the most accurate semantic similarity scores available.

Semantic SEO Insights

Move beyond keyword density. See which content passages have the strongest semantic alignment with your target topics for better rankings in both traditional and AI search.

Advanced Content Control

Skip or include specific page elements using CSS selectors. Perfect for complex pages with navigation, sidebars, or dynamic content.