ClickHouse

ClickHouse develops a fast open-source column-oriented database for real-time online analytical processing (OLAP), released under the Apache licence, and sells a managed cloud service built on it. Its products extend to a unified data stack for transactions and analytics, managed observability with long-term retention, observability tooling for large language model (LLM) applications, and an in-process SQL engine. It is incorporated in Delaware with headquarters in the San Francisco Bay Area and a European office in Amsterdam.