Best AI tools for hybrid search

Elasticsearch Vector Search

RAG · BYO embeddings (OpenAI, Cohere, Hugging Face, Mistral, Bedrock, Vertex, Azure) plus Elastic's built-in ELSER sparse model and E5 dense model

8.7

Hybrid vector + keyword search in the enterprise-grade Elasticsearch engine

Snowflake Cortex

RAG · Anthropic Claude, Meta Llama, Mistral Large 2, Snowflake Arctic

8.7

Generative AI and RAG built into the Snowflake data cloud

DataStax Astra DB

RAG · Bring-your-own embeddings; integrates with OpenAI, Cohere, Hugging Face, Mistral, NVIDIA NIM, and Vertex AI via server-side vectorize

8.6

Serverless vector and document database for production RAG and AI agents

MongoDB Atlas Vector Search

RAG · Bring-your-own embeddings (OpenAI, Cohere, open models); native Voyage AI embeddings and rerankers

8.6

Vector search built into the operational database you're already using.

Weaviate

RAG · Hosted vector DB (not an LLM)

8.4

Open-source vector DB with hybrid search and modules.

Feast

RAG

8.2

Open-source feature store that serves consistent features to ML training and online inference, with RAG vector search built in.

LanceDB

RAG

8.2

Open-source multimodal lakehouse and vector database built for AI training and retrieval at petabyte scale.

Scite

RAG · Multi-model

8.2

AI research assistant that grades citations as supporting, contrasting, or mentioning across 1.6B citation statements.

Vespa

RAG · Hosted search engine (not an LLM)

8.2

Yahoo's open-source search engine with vector + sparse retrieval.

Chroma

RAG · Hosted vector DB (not an LLM)

8.1

Embedded, developer-friendly vector store for Python.

Databricks Vector Search

RAG · Multi-model (BYO embeddings or Databricks-hosted)

8.1

Managed hybrid vector search that lives inside the Databricks lakehouse and auto-syncs with your source tables.

NotebookLM

RAG · Gemini 2.5

8.1

Google's source-grounded research notebook that turns your documents into chats, briefs, and AI-hosted podcasts.

RAGFlow

RAG · Multi-model

8.1

Open-source RAG engine with deep document parsing, hybrid search, and visual agent orchestration.

Exa

RAG · Proprietary neural + keyword search

8.0

Web search API built for AI agents, with structured outputs and token-efficient highlights.

Humata.ai

RAG · Multi-model

7.8

Chat-with-your-documents RAG tool with citation-backed answers across uploaded PDFs and files.

Agentset

RAG · Multi-model (Claude, OpenAI, Google, xAI, Cohere, Mistral, DeepSeek)

7.3

Production-ready RAG infrastructure with agentic search, citations, and model-agnostic plumbing.

Epsilla

RAG · Multi-model

7.3

Agent-as-a-Service platform with managed RAG and a no-code builder for vertical enterprise AI.

Rayyan

RAG

7.3

AI-assisted systematic review platform for screening, deduplicating, and extracting data from large literature corpora.

Emergent Mind

RAG · Undisclosed

7.2

AI-curated arXiv discovery layer that summarizes frontier papers and aggregates social discussion around them.

FinChat (Fiscal.ai)

RAG · Multi-model (proprietary finance-tuned copilot)

7.2

AI copilot for equity research that reads filings, transcripts, and KPI tables across 100,000+ public companies.

Graphiti

RAG · Multi-model

7.2

Open-source temporal knowledge graph framework for building agent memory that updates in real time.

Perplexity AI

RAG · Multi-model (Sonar, GPT-4 class, Claude, Gemini)

7.2

Conversational answer engine that cites its sources by default.

BGE (BAAI General Embedding)

RAG · BGE / bge-m3 / bge-reranker

7.1

Open-source embedding and reranker models from BAAI that anchor a huge share of production RAG stacks.

Elicit

RAG · Claude Opus 4.5

7.1

AI research assistant that searches, screens, and extracts data from 138M+ academic papers at scale.

FutureHouse Platform

RAG · Multi-model

7.1

Multi-agent AI research stack for scientists, with retrieval over 175M+ papers, patents, and trials.

PostgresML

RAG · Multi-model (Llama, Mistral, open-source embeddings)

7.1

PostgreSQL extension that runs embeddings, vector search, and LLM inference inside your database.

Rivestack

RAG · OpenAI embeddings (auto-embeddings)

7.1

Managed Postgres with pgvector on dedicated NVMe, pitched as a cheaper RAG backend than Pinecone or Supabase.

alphaXiv

RAG · Multi-model

7.0

AI reading layer over arXiv with grounded Q&A, auto-summaries, and line-by-line discussion on every preprint.

Graphify

RAG · Multi-model

7.0

Open-source on-device knowledge graph engine that turns code, docs, papers, meetings and images into a queryable graph.

HelixDB

RAG

7.0

Unified graph-and-vector database built for AI agent memory and GraphRAG.

Kotaemon

RAG · Multi-model (OpenAI, LlamaCPP, any OpenAI-compatible endpoint)

7.0

Open-source RAG UI for chatting with your own documents, locally or self-hosted.

PageIndex

RAG

7.0

Vectorless reasoning-based retrieval for long documents, with traceable, auditable answers.

Singlebase Cloud

RAG · Multi-model

7.0

AI-native Firebase alternative bundling document DB, vector DB, auth, storage, and built-in AI services.

Chat With PDF by Copilot.us

RAG

6.9

Conversational PDF Q&A bundled into a multi-app productivity membership.

CocoIndex

RAG · Bring-your-own (embeddings + LLM)

6.9

Open-source incremental data framework that keeps RAG indexes and agent context continuously fresh.

Cohere

RAG · Command, Embed, Rerank, Transcribe (proprietary)

6.9

Enterprise-grade LLM platform built for private, secure, and customizable deployment.

DeepSearcher

RAG · Multi-model (DeepSeek, OpenAI o1/o3-mini, Claude, Llama, others)

6.9

Open-source agentic RAG framework for private enterprise data, built by the Zilliz/Milvus team.

Haystack

RAG · Multi-model

6.9

Open-source Python framework from deepset for building production RAG pipelines and LLM agents.

Refinder AI

RAG

6.9

Chat-native enterprise search and task automation hub that lives inside Slack and Google Chat.

You.com

RAG · Multi-model

6.9

Web search and research APIs purpose-built for LLMs and AI agents.

aiPDF

RAG

6.8

Chat-with-your-documents app that ingests PDFs, EPUBs, web pages and YouTube videos with cited answers.

ChatPDF

RAG · GPT-4o / GPT-4o-mini

6.8

Conversational Q&A over PDFs and other documents with citation-backed answers.

Context Data

RAG · Multi-model

6.8

Enterprise data platform for deploying private RAG pipelines without infrastructure plumbing.

Explainpaper

RAG · Undisclosed (tiered basic vs. advanced)

6.8

AI reading companion that decodes dense academic papers by highlighting and chatting with the PDF.

Genei

RAG · GPT-3 (per public site)

6.8

AI research assistant that summarizes PDFs and web pages and answers questions across your document library.

Recall

RAG · Multi-model (GPT, Claude, Gemini)

6.8

AI-powered personal knowledge base that summarizes, links, and quizzes you on everything you save.

TurboVec

RAG

6.8

Rust-powered vector index with 2-4 bit TurboQuant compression for SIMD-accelerated RAG search.

Cosmos

RAG

6.6

AI-powered archive search and reel curation for video production companies.