RAG frameworks: AI tools compared (October 2026)

IONOS AI Model Hub

Managed platform for language and image models from German IONOS data centers, with an OpenAI-compatible API and RAG.

Neo4j

Graph database with vector search, GraphRAG building blocks and Aura Agent, as managed AuraDB or self-managed.

Pinecone

Fully managed vector database with integrated embedding models, full-text search and an assistant component for RAG applications.

Qdrant

Open-source vector database from Berlin, available as managed cloud, hybrid cloud in your own infrastructure or private cloud.

FalkorDB

Multi-tenant graph database for GraphRAG and agent memory, with vector and full-text search, self-hosted or as a cloud service.

turbopuffer

Serverless search engine on object storage for vector, full-text and hybrid search, with regions in North America, Europe and Asia Pacific.

Weaviate

Open-source vector database from Amsterdam with hosted embedding models and a Query Agent for natural-language queries.

AnythingLLM

Open-source AI app from Mintplex Labs for chat with documents and agents, as a desktop app, self-hosted or in the cloud.

Chroma

Open-source embedding database with a four-function API, usable locally or as managed Chroma Cloud.

Memgraph

In-memory graph database with vector search, GraphRAG tooling and MCP support, as open-source Community Edition or Enterprise.

LanceDB

Embedded open-source database for multimodal AI data on the Lance columnar format, with vector, full-text and SQL search.

LightRAG

Open-source RAG from the University of Hong Kong that builds a knowledge graph from documents and answers questions via graph and vectors.

Vectara Hallucination Leaderboard

Public leaderboard of how often language models add hallucinations when summarizing documents, scored with Vectara's open HHEM model.

Haystack

Open-source framework from Berlin-based deepset for AI agents, RAG pipelines and search, independent of the model provider.

Milvus

Distributed open-source vector database under the LF AI & Data Foundation, built for billions of vectors and hybrid search.

Onyx

Open-source platform for enterprise search and AI chat with 50+ connectors, agents and deep research, self-hostable.

PaperQA2

Open-source tool from FutureHouse that answers questions from scientific PDFs with citations and finds contradictions between papers.

pgvector

Open-source PostgreSQL extension that stores vectors next to your other data and searches them by similarity.

RAGFlow

Open-source RAG engine with document understanding, visible chunking, citations and agent workflows, self-hosted or as a cloud service.