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Faiss Alternatives in 2026

The best 8 open-source Faiss alternatives in 2026, ranked by GitHub stars. Find free, self-hosted replacements for Faiss.

8 Alternatives
100% Open Source
Free To Self-Host

What are the best Faiss alternatives in 2026?

The best open-source Faiss alternatives in 2026 are Annoy, Milvus, Qdrant, Chroma, pgvector. These tools cover the same use cases as Faiss — facebook's library for efficient similarity search and clustering — with the advantage of being open-source, free to self-host, and backed by active communities. Top picks are ranked by GitHub stars and community adoption, so you can find a drop-in replacement that fits your workflow.

#1
Annoy ★ 14k+ Top Pick

Approximate nearest neighbors library by Spotify

vector-search approximate embeddings open-source
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#2
Milvus ★ 46k+ Top Pick

Open-source vector database for scalable similarity search

vector-db embeddings open-source cloud-nativeApache-2.0
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#3
Qdrant ★ 34k+ Top Pick

High-performance vector similarity search engine

vector-db embeddings rust open-sourceApache-2.0
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#4
Chroma ★ 29k+

Open-source AI-native vector database

vector-db embeddings rag open-source
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#5
pgvector ★ 23k+

Open-source vector similarity search for PostgreSQL

vector-db postgresql embeddings open-source
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#6
Sentence Transformers ★ 19k+

Multilingual sentence, paragraph and image embeddings

embeddings nlp search open-source
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#7
Gensim ★ 16k+

Topic modelling and document similarity library

nlp topic-modeling embeddings open-source
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#8
txtai ★ 13k+

All-in-one open-source embeddings database

embeddings search rag open-source
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Last updated: Aug 28, 2026 · Curated by AI Tools Hub Editorial · About · Contact · Privacy