Katapult is a kickstart generator for Rails applications. It creates new Rails applications with lots of pre-configuration and offers makandra-flavored code generation from an application model. These two features significally speed up the initial phase of a Rails project by doing in minutes what otherwise would cost you weeks. After modeling your application, which typically takes about an hour, you can instantly start implementing the meat of your application. Katapult only supports a single Ruby and Rails version, currently it's Rails 5.1.4 and Ruby 2.5.0.