Best Free Vector Databases in 2026
10 free and open-source vector databases ranked by community adoption, search interest, and review quality.
6 open-source · 2 freemium · 2 free · Last verified March 25, 2026
Free Vector Databases at a Glance
| # | Tool | Score | License | Paid Plans |
|---|---|---|---|---|
| 1 | Typesense Typesense is a fast, typo-tolerant search engine optimized for instant search-as-you-type experiences and ease of use. | 73 | Open Source | Self-host only |
| 2 | Marqo Marqo optimises search conversion using click-stream, purchase and event data, creating a personalised experience that knows what your customers are looking for - better than they do. | 65 | Open Source | Self-host only |
| 3 | Weaviate Bring AI-native applications to life with less hallucination, data leakage, and vendor lock-in | 46 | Freemium | Free |
| 4 | ChromaDB The AI-native open-source embedding database for LLM applications | 45 | Free | Free |
| 5 | Milvus Milvus is an open-source vector database built for GenAI applications. Install with pip, perform high-speed searches, and scale to tens of billions of vectors. | 45 | Free | Free |
| 6 | Qdrant Qdrant is an Open-Source Vector Search Engine written in Rust. It provides fast and scalable vector similarity search service with convenient API. | 45 | Freemium | Free |
| 7 | FAISS Library for efficient similarity search and clustering of dense vectors, developed by Meta AI. | 44 | Open Source | Self-host only |
| 8 | LanceDB Build fast, reliable RAG, agents, and search engines with LanceDB— a multimodal vector database with native versioning and S3-compatible object storage. | 44 | Open Source | Self-host only |
| 9 | pgvector Open-source PostgreSQL extension for vector similarity search and embeddings storage. | 43 | Open Source | Self-host only |
| 10 | Vespa Vespa is the AI Search Platform for fast, accurate and large scale RAG, personalization, and recommendation. | 43 | Open Source | Self-host only |
Free & Open-Source Vector Databases: What You Need to Know
Vector databases offer some of the most generous free tiers in the data infrastructure space, driven by intense competition in the AI/LLM ecosystem. Several purpose-built vector databases provide free hosted tiers with enough capacity for production RAG applications serving thousands of queries per day. Open-source options like Qdrant and Milvus can be self-hosted at no licensing cost, and PostgreSQL's pgvector extension adds vector search to existing Postgres deployments for free.
What to Look For in Free Vector Databases
Free vector database tiers typically limit the number of vectors stored, the dimensionality of embeddings, or the number of queries per second. For RAG applications, calculate your expected index size (number of documents × chunks per document) and query volume before choosing. The performance gap between free tiers and paid plans is often significant — free tiers may run on shared infrastructure with higher latency. For self-hosted options, the cost shifts to compute and memory, since vector search is memory-intensive.
All Free Vector Databases
Typesense is a fast, typo-tolerant search engine optimized for instant search-as-you-type experiences and ease of use.
Marqo optimises search conversion using click-stream, purchase and event data, creating a personalised experience that knows what your customers are looking for - better than they do.
Bring AI-native applications to life with less hallucination, data leakage, and vendor lock-in
Milvus is an open-source vector database built for GenAI applications. Install with pip, perform high-speed searches, and scale to tens of billions of vectors.
Qdrant is an Open-Source Vector Search Engine written in Rust. It provides fast and scalable vector similarity search service with convenient API.
Library for efficient similarity search and clustering of dense vectors, developed by Meta AI.
Build fast, reliable RAG, agents, and search engines with LanceDB— a multimodal vector database with native versioning and S3-compatible object storage.
Open-source PostgreSQL extension for vector similarity search and embeddings storage.
Vespa is the AI Search Platform for fast, accurate and large scale RAG, personalization, and recommendation.
Frequently Asked Questions
What is the best free vector databases in 2026?
Based on our composite ranking, Typesense ranks #1 among 10 free vector databases with a score of 73. Marqo and Weaviate are also top-ranked free options. Rankings are recalculated regularly.
What is the difference between free and open-source vector databases?
Open-source tools (Typesense, Marqo, FAISS) publish their source code and can be self-hosted with no licensing restrictions. Free/freemium tools offer no-cost tiers but may limit features, usage, or require a paid upgrade for production workloads. Freemium options like Weaviate and Qdrant provide free tiers with paid upgrades.
How are free vector databases ranked?
We use the same composite scoring as our main rankings: community interest (30%), search interest (25%), review quality (25%), and pricing accessibility (20%). All tools on this page score the full pricing accessibility bonus since they offer free access. No vendor pays for placement.