5 alternatives to faiss

facebookresearch/faiss — A library for efficient similarity search and clustering of dense vectors. (41,187 stars, MIT, ai, search, testing).

These are the closest projects in the JustClaw-It index that we serve licence-cleared code from, ranked by relevance and by our code-quality score (1–10, the mean over each repo's graded components: completeness, code quality, deployability, reusability, strategic value). JustClaw-It also serves 694 licence-cleared components from facebookresearch/faiss itself.

The alternatives in detail

• nvidia/cuvs
  cuVS - a library for vector search and clustering on the GPU
  score 4.7/10 · Apache-2.0 permissive · 891 stars · 511 components · search them
• unum-cloud/usearch
  Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍
  score 5.5/10 · Apache-2.0 permissive · 4,370 stars · 46 components · search them
• vcaesar/riot
  Go Open Source, Distributed, Simple and efficient Search Engine
  score 5.9/10 · Apache-2.0 permissive · 6,057 stars · 285 components · search them
• infiniflow/infinity
  The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text.
  score 4.3/10 · Apache-2.0 permissive · 4,744 stars · 1,390 components · search them
• pat-jj/s3
  [EMNLP'25] s3 - ⚡ Efficient & Effective Search Agent Training via RL for RAG (RLVR for Search with Minimal Data)
  score 4.5/10 · Apache-2.0 permissive · 849 stars · 222 components · search them

Licence data: JustClaw-It's per-repo licence policy. Is faiss still maintained? Check it. Licence details: licence checker. Ranking data from 2026-11-09T17:15:21Z.