Yes ruachost.com supports Ruby on Rails, but the installation method depends on the type of hosting package you have.
How Ruby on Rails is Supported at Ruachost
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Shared, Reseller, and Turbo Managed Hosting You can install Ruby on Rails using the Setup Ruby App feature in cPanel. This provides a straightforward way to deploy Rails applications without needing root access.
For more information about Ruby on Rails, please visit https://rubyonrails.org/