hnswlib Open-Source Approximate Nearest Neighbor Search

Explore this developer service’s ongoing no-cost allowance, restrictions and official documentation before deploying.

INCLUDED FREE ALLOWANCE

Apache-2.0 header-only C++ library with Python bindings for local HNSW approximate nearest-neighbor search; no software license fee or vendor-imposed index/query quota.

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Plan details

What do these plan and deployment labels mean?

Plan: Ongoing free allowance
Deployment model: Local / embedded
Credit card: Not required
Commercial use: Allowed
Added to directory (UTC): 2026-11-01
Last checked: 2026-11-01

Important restrictions

This is a local search library, not a hosted vector-search API or free cloud service. You supply memory, CPU, storage, embeddings, application hosting and backups; third-party embedding APIs and infrastructure can cost money. Observe Apache-2.0 license notices.

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