There are 3 open-source alternatives to Weaviate in this directory. The most popular is Chroma with 27.4k GitHub stars, followed by Pgvector(20.7k stars). All are open source, free to use, and many can be self-hosted.
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Chroma Chroma is an open-source search and retrieval database designed specifically for AI applications. It enables efficient vector storage, similarity search, and large-scale retrieval necessary for modern machine learning and LLM-powered projects. | 27.4k | Rust | Apache License 2.0 |
| 2 | Pgvector Open-source vector similarity search extension for PostgreSQL, enabling efficient and accurate vector-based data retrieval. | 20.7k | C | Other |
| 3 | Memvid Video-based AI memory library for storing millions of text chunks in MP4 files with lightning-fast semantic search, eliminating the need for a traditional database. | 8.3k | Python | MIT License |
Chroma is an open-source search and retrieval database designed specifically for AI applications. It enables efficient vector storage, similarity search, and large-scale retrieval necessary for modern machine learning and LLM-powered projects.
Open-source vector similarity search extension for PostgreSQL, enabling efficient and accurate vector-based data retrieval.
Video-based AI memory library for storing millions of text chunks in MP4 files with lightning-fast semantic search, eliminating the need for a traditional database.
The top three are Chroma(27.4k stars), Pgvector(20.7k stars), Memvid(8.3k stars). All are open source and free to use.
Yes. Every tool listed here is open source and free to use in your own projects. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
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