# Competitor similarity

> Competitor similarity is how close the content of two websites is, measured by comparing their vector embeddings.

- **Check ID:** EMB2
- **Area:** [Tech Stack](https://be1st.ai/glossary/fingerprint)
- **Page:** https://be1st.ai/glossary/fingerprint/competitor-similarity

## Why it matters

Automatically finding similar websites reveals competitors the owner may not have known about. It also helps benchmark the site against actual competition rather than subjective estimates.

## In practice

A Slovak clothing e-shop gets a list of the 5 closest sites from the database: e.g., ZOOT.sk (92%), About You (88%), Answear.sk (85%). The owner thus discovers who they are actually competing with for customers online.

## How be1st checks it

Cosine similarity search in the embeddings database: finding the most content-similar websites in the be1st database. Result: TOP N closest domains with similarity percentage.

This is computed in the background for every audited website. It has no tool page of its own.

## Sources

- [pgvector - Open-Source Vector Similarity Search for Postgres](https://github.com/pgvector/pgvector) (pgvector)

## Related terms

- [CMS / content management system](https://be1st.ai/glossary/fingerprint/cms-content-management-system): A CMS (content management system) is the software a website is built and edited in, such as WordPress, Drupal or Joomla.
- [E-commerce platform](https://be1st.ai/glossary/fingerprint/e-commerce-platform): An e-commerce platform is the software an online store runs on, such as Shoptet, WooCommerce, Shopify or PrestaShop.
- [JS / CSS frameworks + CDN](https://be1st.ai/glossary/fingerprint/js-css-frameworks-cdn): JavaScript and CSS frameworks are the libraries the front end of a website is built with, such as React, Vue, jQuery or Bootstrap, often loaded from a CDN.
- [Analytics & marketing](https://be1st.ai/glossary/fingerprint/analytics-marketing): Analytics and marketing tools are the scripts that measure visitors and run campaigns, such as Google Analytics, Google Tag Manager or the Meta Pixel.
- [Payment gateways](https://be1st.ai/glossary/fingerprint/payment-gateways): A payment gateway is the service that processes card and online payments for a store, such as Stripe, PayPal, GoPay or Comgate.
- [Fonts](https://be1st.ai/glossary/fingerprint/fonts): Web fonts are the typefaces a website loads to display its text, from services such as Google Fonts or Adobe Fonts or from its own files.