Heroku is described as 'Platform as a service (PaaS) that enables developers to build, run, and operate applications entirely in the cloud' and is a very popular Cloud Hosting service in the development category. There are more than 100 alternatives to Heroku, not only websites but also apps for a variety of platforms, including SaaS, Self-Hosted, Linux and Windows apps. The best Heroku alternative is CapRover, which is free. Other great sites and apps similar to Heroku are OpenShift, Replit, Coolify and Google App Engine.
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Its like Heroku Review Apps but its more flexible and easier to set up.