Upsolver is described as 'In-Memory Data Preparation Platform. It removes the complexity from Big Data and Real-Time projects and shortens their implementation time from weeks/months to several hours, literally' and is a Cloud Computing service in the business & commerce category. There are three alternatives to Upsolver, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux, BSD and Self-Hosted apps. The best Upsolver alternative is Apache Spark, which is both free and Open Source. Other great sites and apps similar to Upsolver are Apache Hadoop and Apache Flink.