Definitely a cool concept! I'd be interested in seeing the ability to add alternative gems. For example, they currently use delayed_job but I prefer sidekiq for background workers (which also has a dependency on redis). Anyways, definitely a great start and I can see this saving a ton of time at the beginning of a project.
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Wow this is really well executed. I think this is much better approach than all these site builder services that pretend you don't need to learn coding.
The Nifty
Lex