# Vchord: Scalable Vector Search for PostgreSQL

> Scalable, fast, and disk-friendly vector & BM25 search extensions for PostgreSQL (vchord, vchord_bm25, pg_tokenizer), maintained by PGSTY.

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LLMS index: [llms.txt](/llms.txt)

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Section pages:

- [vchord Documentation](/docs/): Scalable, fast, and disk-friendly vector similarity search in PostgreSQL powered by RaBitQ quantization.
- [vchord_bm25 & pg_tokenizer](/bm25/): Native BM25 ranking index and Block-WeakAnd full-text search for PostgreSQL (`vchord_bm25` & `pg_tokenizer`).
- [VectorChord Engineering Blog & Releases](/blog/): Engineering deep-dives on RaBitQ quantization, billion-scale PostgreSQL vector search benchmarks, BM25 ranking, ColBERT late interaction, and release announcements.
- [VectorChord Cloud Documentation](/cloud/): Managed PostgreSQL vector database service reference: cluster provisioning, connection pooling, monitoring, Terraform, and billing.
- [pgvecto.rs Documentation (Legacy)](/pgvecto-rs/): Complete documentation archive for pgvecto.rs (vectors extension), predecessor to VectorChord.
- [About Vchord & vchord.pgsty.com](/about/): Project overview, licensing, upstream attribution, and trademark policy for the PGSTY-maintained Vchord extension suite and documentation site.
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Backlinks:

- [Beyond Text: Unlock OCR-Free RAG in PostgreSQL with Modal & VectorChord](/blog/post/beyond-text-unlock-ocr-free-rag-in-postgresql-with-modal-and-vectorchord/)
- [ColQwen2 & Modal](/docs/use-case/colqwen2-modal/)