ClickHouse is an open-source relational database management system designed for analytical workloads and big data storage. It's used by Opensee, a financial technology company that provides real-time self-service analytics solutions to financial institutions. The platform allows business users to directly harness 100% of their vast quantities of data instantly and on demand, with no size limitations. Opensee leverages ClickHouse's capacity to handle huge volumes of data and provide fast response times without compromising scalability, granularity, speed, or cost control. The company has developed a low-code API that abstracts complexity and provides simple business queries optimized for performance. Opensee also offers various front-end options to interact with the data, navigate through the cube, and leverage functionality like data versioning. The platform's advantages include its distributed and replicated architecture, wide range of features, format support, rapid evolution through community contributions, and cost efficiency factor that divides hardware costs by 10 or more.