SereneDB is an open-source real-time search and analytics database with a PostgreSQL-compatible frontend. It combines BM25 full-text search, vector search with ANN indexes, hybrid search, SQL execution, OLAP and zero-ETL queries over remote sources. It is built for teams creating search, analytics, AI agent and RAG systems. Install via CLI, Docker or packages, and compare it with ClickHouse, Elasticsearch and OpenSearch on its benchmark page.