Heroku is a platform-as-a-service (PaaS) to deploy apps without worrying about infrastructure.
Any app at any scale: use one of the Buildpacks, or deploy Docker images. Heroku offers a generous free tier that should be plenty for anyone to start hosting Shiny apps.
This review looks at various attributes of Heroku as a hosting option for Shiny apps, including cost, maintenance/deployment, security, branding, and user management.
