SlateDB is described as 'An embedded database built on object storage. Unlike traditional LSM-tree storage engines, SlateDB writes data to object storage to provide bottomless storage capacity, high durability, and easy replication' and is an app. There are more than 50 alternatives to SlateDB for a variety of platforms, including Windows, Linux, Mac, Web-based and Self-Hosted apps. The best SlateDB alternative is SQLite, which is both free and Open Source. Other great apps like SlateDB are PostgreSQL, MySQL Community Edition, MariaDB and MongoDB.