← Back to blog6 Open-Source Vector Databases to Power Your AI App

6 Open-Source Vector Databases to Power Your AI App

Dec 22, 2023.

In the era of AI-driven applications, the ability to efficiently handle and search through vector data is crucial.

Vector databases are designed specifically for this purpose, providing a robust infrastructure for applications such as retrieval-augmented generation (RAG) apps, recommendation systems, and advanced search engines.

Whether you're creating an app to "Chat with a PDF" or need to power a complex recommendation system, vector databases are the engines under the hood that make it all possible.

Today we're diving into 6 open-source vector databases that not only store vectors efficiently but also offer powerful search capabilities, scalability, and ease of integration.

Cat let's do this

Before we jump into the list, we wanted to mention our open-source project Lunary.ai.

🌌 Lunary.ai


At Lunary.ai, we're building an open-source toolkit for AI developers that's a cut above the rest.

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  • Prompt Management: Craft and fine-tune prompts to perfection. Collaborate with non-technical team members.
  • Chat Tracking: Record chatbot interactions to ensure your AI stays on track.

Our platform is designed for developers by developers. We understand the challenges that come with AI development, and that's why we're building the tools to help you best.

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🧲 PGVector


PGVector brings the power of vector similarity search to Postgres. Its seamless integration with Postgres allows you to store vectors alongside other data types, enjoying the full suite of Postgres features like ACID compliance and point-in-time recovery.

Unique aspects of PGVector:

  • Compatibility: Works with any language that has a Postgres client.
  • Versatile: Supports exact and approximate nearest neighbor search.
  • Diverse Metrics: Accommodates L2 distance, inner product, and cosine distance.

Drawbacks: While powerful, PGVector's reliance on Postgres may not suit all use cases, especially when specialized vector database functionality is needed.

⭐ Star PGVector on GitHub

🌐 Weaviate


Weaviate is an AI-native vector database that excels in creating intuitive and reliable AI-powered applications. It uniquely combines vector and keyword search, enhancing semantic understanding and accuracy.

Why Weaviate stands out:

  • Dual Search: Offers both vector and keyword search capabilities.
  • Integration-Friendly: Supports a variety of neural search frameworks.
  • Vectorization Modules: Choose from Weaviate's modules for out-of-the-box vectorization.

Potential drawbacks: The richness of features may come with a steeper learning curve for developers new to vector databases.

⭐ Star Weaviate on GitHub

🎨 ChromaDB


ChromaDB is all about simplicity and developer productivity. It's a vector database designed for speed and ease of use, especially when building Python or JavaScript LLM apps.

ChromaDB's distinctive features:

  • Developer-Friendly: Boasts a fully-typed, tested, and documented API.
  • Scalability: Runs in a python notebook and scales to your cluster.
  • Rich Feature Set: Offers queries, filtering, and density estimation.

Drawbacks: ChromaDB's focus on simplicity may limit some advanced use cases that require more complex database operations.

⭐ Star ChromaDB on GitHub

🔍 Milvus


Milvus is a cloud-native vector database that is highly scalable and elastic. It's designed to make unstructured data search more accessible, with a consistent user experience across various environments.

What makes Milvus special:

  • Speed: Delivers millisecond search on trillion vector datasets.
  • Elasticity: Stateless components enhance scalability and flexibility.
  • Hybrid Search: Supports both vectors and scalar data types for complex searches.

Drawbacks: The sophistication of Milvus might be overkill for smaller projects that don't require its extensive feature set.

⭐ Star Milvus on GitHub

🧭 Qdrant


Qdrant is a vector similarity search engine and database written in Rust, making it fast and reliable even under high load. It's tailored to extended filtering support, which is useful for a variety of applications.

Qdrant's key features include:

  • Rust Performance: Offers speed and reliability.
  • Extended Filtering: Ideal for neural-network or semantic-based matching.
  • Production-Ready: Provides a convenient API for storage, search, and management.

Potential drawbacks: The Rust-based nature of Qdrant might present a learning curve for teams not familiar with the language.

⭐ Star Qdrant on GitHub

🔎 ElasticSearch


While ElasticSearch isn't a dedicated vector database, it's an invaluable tool for storing and searching over vector data. It's optimized for speed and relevance on production-scale workloads.

ElasticSearch's advantages:

  • Distributed Architecture: Ideal for real-time search on large datasets.
  • Versatility: Handles vector search, full-text search, logs, metrics, and more.

Drawbacks: ElasticSearch's broad scope may require additional configuration to optimize for vector-specific use cases.

⭐ Star ElasticSearch on GitHub

Vector databases are the unsung heroes of AI applications, providing the infrastructure needed for sophisticated data handling and retrieval.

Whether you're building a chatbot that can converse with a PDF or a complex recommendation engine, these open-source vector databases offer the power and flexibility to bring your ideas to life.

Do you have experience with any of these vector databases, or do you have another favorite that didn't make the list? Share your thoughts in the comments and let's discuss the best database for the job!

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Open Source
Self Hostable
Public API
Prompt Templates
Chat Replays
Agent Tracing
Feedback Tracking
LangChain Support