Alternatives to Vespa

Vespa AI is an open-source AI search platform for hybrid vector, text and structured retrieval with ML ranking in one query pass.

Apache Doris is an open-source real-time SQL database for unified OLAP analytics, full-text search, and vector search.

Lance is an open lakehouse format for multimodal AI, pairing a file format, table format, and catalog spec with hybrid vector and full-text search on object

Open-source cloud-native data warehouse that runs BI analytics, vector search, full-text search and geospatial on one SQL engine

Open-source RAG engine with built-in ETL, hybrid search and visual agent orchestration for enterprise AI agents

Open-source vector similarity search that lives inside your existing Postgres database.

Open-source context retrieval layer that syncs your apps and databases so AI agents query live business data in natural language.

Open-source vector database for GenAI apps, scaling from a pip install to tens of billions of vectors

Open-source Microsoft Research RAG that builds a knowledge graph and community summaries from your documents, then queries them in four modes.

LanceDB is an open-source multimodal lakehouse that keeps curation, features, search, and training on one Lance table.

Open-source Python framework that incrementally keeps AI agent context fresh by reprocessing only changed data.

Open-source in-process vector database from Alibaba — install one Python package, query millions of vectors in seconds.

Self-hosted RAG search engine for private document search — BM25 plus hybrid retrieval across 34 file formats.

Open-source desktop AI that reads any file on your own machine — documents, email, video, audio — without chunking or cloud uploads.

LitePali is a small open-source Python library for image-based document retrieval built on the ColPali architecture.

TopK is a unified retrieval engine that runs multi-vector, dense, sparse, regex, and metadata-filtered search in one query, billed per unit of usage.

Open-source wire protocol suite that standardizes LLM, vector, graph, and embedding calls so you swap providers in config, not code

Fully managed vector database and knowledge platform: search, upsert, and rerank from one index and one API key.

Weaviate is an open-source AI database for vector search, hybrid search, and RAG with built-in embeddings and agent memory.

Open-source Rust vector search engine with one-stage filtered HNSW, native hybrid search, and the same engine on cloud, hybrid, edge, or air-gapped private

Fully managed vector database on Milvus for large-scale AI search, RAG, and recommendation workloads.

VectorShift is an AI operating system for private market investors, tracing every figure back to the source document and page.

Apache 2.0 search infrastructure for AI that keeps vectors, indexes and metadata on cheap object storage.

TiDB is a distributed SQL database with native vector search for AI agent memory, state, and RAG at scale.

Open-source agent platform that fuses knowledge graphs with RAG for self-hosted, explainable enterprise AI.

Open-source CLI that turns 18 source types into AI skills and RAG knowledge for 22 AI platforms.

Elasticsearch Labs: free tutorials, notebooks, and reference apps for AI search, vector search, and RAG on Elasticsearch.

Self-hosted code search and AI code Q&A that gives coding agents context across every repo you own

Open-source, in-memory text vector database for .NET apps that adds semantic search and RAG without provisioning a vector server.

Xberg is an open-source content intelligence engine that turns 107 document, web, code, image and audio formats into clean Markdown and