Alternatives to PGVector

Open relational DB. Rechecked: PostgreSQL License, 21,814 stars, 18.6 current. Not a leftover BSD slogan page.

Open vector search. Rechecked: OSS + Cloud Free; Standard usage-based; Premium min spend. Not an unpriced modeling tool.

Open Firebase alternative. Rechecked: Free $0; Pro from $25; Team from $599. Auth/storage shipped; not still-in-development.

Meta ANN library. Rechecked: MIT, 40,752 stars, faiss.ai. A library, not a hosted vector DB or marketing ally.