Get AI semantic similarity scores in seconds. Free to start. No tracking. Built by SEOs, for SEOs.
See how ChatGPT, Google AI Overviews, and other AI systems understand your content—powered by Google Vertex AI.
"Built for SEOs who need semantic insights, fast. Start free, upgrade as you grow."
— Go Fish Digital Team
AI search engines like ChatGPT, Perplexity, and Google AI Overviews don't just match keywords—they understand semantic meaning. Similarity uses Google's Vertex AI to score your content exactly the way these AI systems do.
20 pages/month free. Upgrade for more capacity.
Your data stays yours. Zero analytics or tracking.
Constantly improving with new features in 2025.
Optimize for AI search in 4 simple steps
Enter your target keyword and instantly see how AI systems understand your page. Our Chrome extension uses the same AI embedding technology that powers ChatGPT and Google AI Overviews to score semantic similarity.
Every passage on your page gets a color-coded score. High scores (green) mean AI systems strongly associate that content with your keyword. Low scores (yellow/red) reveal opportunities to strengthen semantic relevance for better AI visibility.
Experiment with different wording and instantly see how it impacts your AI semantic score. Perfect your content for maximum AI visibility before making changes to your live site. Optimize for both traditional SEO and Generative Engine Optimization.
Track every page analyzed and content improvement made. Monitor semantic scores across your entire site, compare keyword performance, and measure your progress in optimizing for AI search engines.
Join SEOs using AI-powered semantic analysis. Free to start.
Add to ChromeEverything you need for SEO and Generative Engine Optimization
Understand how AI systems like ChatGPT, Perplexity, and Google AI Overviews interpret your content. Optimize for the generative engines that are reshaping search.
Uses Google's enterprise-grade Vertex AI embedding model—the same technology powering modern AI search. Get the most accurate semantic similarity scores available.
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.
Start free, upgrade when you need more capacity
The Chrome extension is free to install. Plans below give you higher usage limits (20 pages free → 250 pages with Pro).
$0/month
$29/month
All plans include core features. Upgrade or downgrade anytime.
Regular updates to keep improving your GEO workflow
Similarity is now live! The first Chrome extension built specifically for Generative Engine Optimization. Get AI semantic similarity scores powered by Google Vertex AI.
Analyze multiple pages at once and export results. Compare semantic scores across your entire site.
Get AI-powered recommendations for improving low-scoring passages based on top-performing content.
Join forward-thinking SEOs optimizing content for ChatGPT, Google AI Overviews, and the future of AI-powered search.