Introducing Citai: the RAG engine I built across 6 articles — now free to try

Over the last 6 articles I shared how I built every piece of a production RAG engine: hybrid search, cross-encoder reranking, SSE streaming, multi-tenancy, semantic cache and language detection. Today I'm introducing the finished product: Citai (cite + AI) — a knowledge engine with verifiable citations that anyone can try for free at citai.ai . The full series If you're landing on this article first, here's everything I built and documented: RAG Pipeline — hybrid search (pgvector + BM25), cross-