pgvector alternatives

Stores embeddings alongside relational + full-text data. HNSW + IVFFlat ANN indexes. Used as agent conversation memory via LangChain + MCP. Foundation of Supabase AI and many self-hosted RAG stacks. Full pgvector record →

  1. 1 MongoDB Atlas Vector Search Vector-database infrastructure

    also in Vector-database infrastructure · same storage (vector, relational) · same retrieval (similarity, exact-match) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ? Self-host ✓ Managed ✓ MCP ✓ Compare with pgvector →

  2. 2 Pinecone Vector-database infrastructure

    also in Vector-database infrastructure · same storage (vector) · same retrieval (similarity) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ? Self-host ✓ Managed ✓ MCP ✓ Compare with pgvector →

  3. 3 Vespa Vector-database infrastructure

    also in Vector-database infrastructure · same storage (vector, relational) · same retrieval (similarity, exact-match) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ? ★ 7.1k Apache-2.0 Compare with pgvector →

  4. 4 Turbopuffer Vector-database infrastructure

    also in Vector-database infrastructure · same storage (vector) · same retrieval (similarity) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ? Self-host ✓ Managed ✓ MCP ? Compare with pgvector →

  5. 5 Elasticsearch Vector-database infrastructure

    also in Vector-database infrastructure · same storage (vector) · same retrieval (similarity, exact-match) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 78k AGPL-3.0 / SSPL-1.0 / Elastic-2.0 (choice) Compare with pgvector →

  6. 6 Milvus Vector-database infrastructure

    also in Vector-database infrastructure · same storage (vector) · same retrieval (similarity) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 46k released 2026-10-14 Apache-2.0 Compare with pgvector →

  7. 7 Qdrant Vector-database infrastructure

    also in Vector-database infrastructure · same storage (vector) · same retrieval (similarity) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 35k released 2026-10-05 Apache-2.0 Compare with pgvector →

  8. 8 Chroma Vector-database infrastructure ⚠ acquired — acquired by Replit

    also in Vector-database infrastructure · same storage (vector) · same retrieval (similarity) · same conflict handling (overwrite) · same memory unit (chunk) · also self-hostable · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 29k released 2026-10-13 Apache-2.0 Compare with pgvector →

Ranked by shared memory design (storage, retrieval, conflict handling, memory unit), same section and shared must-haves (open source, self-hosting, MCP), with adoption as a tie-breaker. ✓ confirmed · — no · ? not in the catalog yet. Want picks for your own requirements? Use the chooser. Checking a whole project? Check your stack.