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Exa

Freemium
aisearch apillmdeveloper toolssemantic searchapiragknowledge retrievalweb search

Exa is a powerful, specialized API for developers who need to ground their LLM applications in real-time web data. While not a consumer search tool, it's a critical piece of infrastructure for building sophisticated AI agents.


An API that enables AI agents to reason over the web by providing reliable, real-time access to information through a search engine built for LLMs.

Exa, formerly known as Metaphor, is a knowledge API designed to connect Large Language Models (LLMs) with the live, up-to-date web. Unlike traditional search engines that rely on keywords, Exa functions as a 'search engine for LLMs,' allowing developers to query the internet using natural language and semantic concepts. The API takes a descriptive prompt about the desired information and returns a list of relevant links along with their clean HTML content, ready for an AI agent to process. This platform is built specifically for developers, AI engineers, and companies creating AI-powered applications. It is an essential tool for building agents that require real-time information for tasks like research, analysis, or providing grounded answers. By offering official SDKs in Python and JavaScript/TypeScript, and integrations with popular frameworks like LangChain and LlamaIndex, Exa aims to be the go-to infrastructure layer for giving AI applications reliable access to the world's knowledge.

Pros

  • Specifically built for LLM and AI agent workflows
  • Generous free tier for initial development and testing
  • Provides clean HTML content, saving developers data preprocessing work
  • Semantic search allows for more natural, intent-based queries
  • Easy to integrate with popular AI frameworks like LangChain and LlamaIndex

Cons

  • Niche product focused solely on developers building with AI
  • Pricing can become significant for high-volume applications
  • Search return speed can be slower than traditional keyword search APIs
  • As a newer company, it is less established than major search providers

Key features

  • Neural search API designed for LLMs and AI agents
  • Performs semantic searches based on intent, not just keywords
  • Returns clean, ad-free HTML content from result URLs
  • Ability to scope searches to a specific list of domains
  • 'Find Similar' endpoint to discover content related to a given URL
  • 'Highlights' endpoint to get relevant text snippets from an article
  • Official Python and Node.js/TypeScript SDKs for easy integration
  • Optimized for Retrieval Augmented Generation (RAG) use cases

Integrations

LangChainLlamaIndex

Target audience

Developers, AI engineers, and companies building AI agents that require real-time web access and knowledge retrieval.


Ratings & Reviews

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Key Metrics

Founded

2022

Headquarters

San Francisco, USA

Pricing Tiers

Launch

Free

Scale

$100/mo

Enterprise

Custom


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