built.io is described as 'Is raw engineering's proven mobile and web application development platform, designed from the ground up for the enterprise. By powering the entire backend – servers, cloud infrastructure, database, scaling – and delivering built-in enterprise app functionality' and is a backend as a service in the development category. There are more than 50 alternatives to built.io for a variety of platforms, including Web-based, Android, iPhone, Windows and Self-Hosted apps. The best built.io alternative is Supabase, which is both free and Open Source. Other great apps like built.io are Firebase, remoteStorage, Etebase and GUN.