hnswlib

license

Apache-2.0(OSI)

source

public

core-gated

ungated

Apache-2.0 license body confirmed. The repository is public and unarchived and builds the whole product, and the README describes no paid tier, enterprise edition or license-gated build beside it, so source is public and the core ungated.

• https://github.com/nmslib/hnswlib/blob/master/LICENSE recorded 2026-08-18

  LICENSE file is the verbatim Apache-2.0 text

• https://api.github.com/repos/nmslib/hnswlib recorded 2026-08-18

  Repo metadata - license spdx_id Apache-2.0, private false, archived false, default branch master - for nmslib/hnswlib.

• https://github.com/nmslib/hnswlib/blob/master/README.md recorded 2026-08-18

  README describes a header-only C++ HNSW implementation with Python bindings supporting insertions, updates and filtered search, with no paid tier, enterprise edition or license-key-gated build beside it.

544,320 PyPI downloads of `hnswlib` in the trailing 30 days, which lands in the 100K-1M band of the software usage scale, level 3. The PyPI project's declared source URL points at the author's own hnsw repository rather than nmslib/hnswlib; the package is this library's Python distribution and not a client for something else, so the figure is the product's.

• https://pypistats.org/api/packages/hnswlib/recent recorded 2026-08-18

  last_month downloads = 544,320 for hnswlib

Banded on the category feature matrix as single index family as a library. Placed two bands below the chroma anchor, on a matrix that bands on how much of the persist-index-retrieve path a product provides itself, at what scale and over how many retrieval modes.

• https://github.com/nmslib/hnswlib/blob/master/README.md recorded 2026-08-18

  README still documents a header-only C++ HNSW implementation with Python bindings supporting insertions, updates and filtered search.