Which is more popular, Faiss or pgvector?

Faiss has more GitHub stars (41,021 vs 23,226).

Which is more actively developed, Faiss or pgvector?

Faiss had more commits in the last 90 days (197 vs 128).

Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.

Side-by-side comparison of two AI agent tools

pgvector is growing faster: +435 GitHub stars in the last 30 days vs +236 for Faiss.
Pick Faiss for: a library for efficient similarity search and clustering of dense vectors. Pick pgvector for: open-source vector similarity search for Postgres.

From GitHub data refreshed daily.

Faissopen-source

A library for efficient similarity search and clustering of dense vectors.

Open-source vector similarity search for Postgres

+Native PostgreSQL integration preserves ACID compliance, transactions, and allows complex JOINs between vector and relational data
+Supports multiple vector types (single/half-precision, binary, sparse) and distance metrics (L2, cosine, inner product, Hamming, Jaccard)
+Wide ecosystem compatibility with any language that has a Postgres client and available through multiple installation methods

-Requires PostgreSQL expertise and may have steeper learning curve compared to dedicated vector databases
-Installation complexity varies by platform, especially on Windows systems
-Performance may not match specialized vector databases for very large-scale vector workloads

•RAG (Retrieval Augmented Generation) applications where embeddings need to be stored alongside document metadata and user data
•E-commerce recommendation systems that combine vector similarity with product catalog data and user preferences
•Semantic search applications where vector queries need to be combined with traditional filters and business logic

Which is more popular, Faiss or pgvector?: Faiss has more GitHub stars (41,021 vs 23,226).
Which is more actively developed, Faiss or pgvector?: Faiss had more commits in the last 90 days (197 vs 128).
Should I use Faiss or pgvector?: Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.