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Search · Tavily
Search API built for AI agents. First-class in most agent frameworks.
Search-as-a-tool for LLM agents — returns scrape-friendly results tuned for retrieval rather than ranking. Native integrations across LangChain, LangGraph, CrewAI, and the major agent surfaces.
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Perplexity AI
AI-augmented search. Cited answers, consumer + Sonar API.
Hybrid search engine that returns synthesized answers with inline citations rather than a list of links. Ships a consumer product and the Sonar API for adding cited search to your own apps and agents.
AI insight: Its Sonar API exposes the same cited-search engine to your own app — so it's an answer product and a retrieval backend at once.
Jina AI
Search-foundation APIs — Reader, embeddings, and reranker — for grounding LLMs.
A suite of search-foundation APIs for retrieval and RAG: a Reader that turns any URL or web search into LLM-ready markdown, multilingual multimodal embeddings, and a reranker. One key spans every service, the Reader is open source, and the embedding models are also released as open weights for self-hosting.
AI insight: Prepend r.jina.ai/ to any URL to get clean, LLM-ready markdown — no signup for basic use, and the Reader is open source.
Liner
AI search and research copilot with cited answers.
An AI search and research assistant that returns cited, fact-checked answers across the web, YouTube, and PDFs, with dedicated modes for academic literature review (Liner Scholar) and professional writing (Liner Write). It grew out of a popular web-highlighting tool and now spans browser, mobile, desktop, and a browser extension. The free tier covers everyday search; Pro unlocks more models, file uploads, and unlimited copilot use.
AI insight: Started in 2015 as a web-highlighter before pivoting to AI search; the company migrated its canonical domain from getliner.com to liner.com.
Linkup
Production-grade web search API for AI agents.
A web search API built for LLMs and agents. Linkup returns sourced, cited answers with full-text snippets in seconds, plus a Fetch endpoint for URL extraction and a Research endpoint that runs multi-step, chain-of-thought deep research. It integrates via MCP and SDK wrappers for OpenAI, LangChain, CrewAI, and more, and offers zero-data-retention enterprise hosting.
AI insight: Ranks #1 on OpenAI's SimpleQA benchmark; billed per request — search around $0.005, deep research up to $2.50.
Morphic
Open-source AI answer engine with a generative UI.
A self-hostable answer engine that returns comprehensive, cited answers with a generative UI that adapts per query rather than a list of links. It offers a Quick mode and an Adaptive multi-step research mode, saves searchable history, and is provider-agnostic across LLM and search backends. Apache-2.0, deployable to Vercel in one click, with a free hosted instance at morphic.sh.
AI insight: Apache-2.0 and provider-agnostic: pluggable across OpenAI, Anthropic, or local Ollama models and Tavily, Brave, or SearXNG search backends.
Parallel Web Systems
High-accuracy web search and research APIs for AI agents.
Parallel gives AI agents programmatic access to the web through a suite of APIs — a Search API, a Task API for structured extraction, and a Deep Research API for multi-hop questions — all served from its own proprietary web index and retrieval stack. It optimizes for high-signal, low-noise context fed straight into a model rather than ranking URLs for human clicks. Pricing is per request (the Search API starts at $0.005 per call) with a free allotment to start.
AI insight: Founded by ex-Twitter CEO Parag Agrawal; it bills per request, not per token, over a proprietary web index built for AI agents.
You.com
Multi-model AI search and enterprise research agents.
You.com is an AI search and answers product offering multi-model chat over OpenAI, Anthropic, and Google models on web and mobile. It has shifted toward enterprise with ARI, a research agent that synthesizes cited reports across hundreds of sources, alongside Search and Research APIs for developers.
AI insight: Pivoted from consumer Google-rival to enterprise — its ARI research agent and APIs now lead, priced per report rather than per compute-hour.
Brave Software
Independent search index. Privacy-respecting, non-Google.
API access to Brave's independently-crawled search index. Useful when you need a non-Google source, want to dodge upstream rate limits, or have privacy posture requirements that rule out scraping competitors.
AI insight: One of the few search APIs backed by a genuinely independent crawl, not resold Bing or Google results.
Exa Labs
Neural search API. Find pages by meaning, not keywords.
Semantic search engine that indexes the open web with embeddings — pass a description, get matching pages. Strong for research-style queries and find-similar workflows; formerly known as Metaphor.
AI insight: Indexes the web by meaning, so 'find pages like this one' works as a query — formerly known as Metaphor.