Sinatra[1] is more like Flask. From your list Rails has an ORM (ActiveRecord) and built in ActionView form helpers, but no default admin interface or authentica

Sinatra[1] is more like Flask. From your list Rails has an ORM (ActiveRecord) and built in ActionView form helpers, but no default admin interface or authentication. The standard authentication library in the community is usually Devise[2]. What ‘etc’ includes is difficult to comment on :) [1] http://sinatrarb.com/ http://sinatrarb.com/ [2] https://github.com/plataformatec/devise https://github.com/plataformatec/devise