Exa (formerly Metaphor)

Exa is a search engine built for the AI era. Traditional engines (like Google) rely on keyword matching. Exa uses embeddings to understand the meaning of a link. If you search for "the best blog posts on stoicism," Exa finds high-quality writing that sounds like a great blog post, rather than just pages that repeat the word "stoicism."

### The "Search by Link" Feature
One of its most niche and powerful features is "Similarity Search." You can provide a URL you love and ask Exa: *"Find me 50 more pages that are exactly like this."*

* **Deep Filtering**: Filter by date, domain, or "content type" (e.g., only PDF papers, or only personal blogs).
* **LLM-Friendly**: Designed to be the "retrieval" layer for AI agents, providing clean, high-signal results for RAG pipelines.

**Best for**: Market researchers, AI developers building search agents, and anyone tired of SEO-optimized "junk" in standard search results.