Co-founder of cloudron here. There is a demo at <a href="https://my-demo.cloudron.me/" rel="nofollow">https://my-demo.cloudron.me/</a> (username: cloudron password: cloudron). It's hidden deep below the blog post. Happy to answer any questions.
What is a "small", "medium", and "large" instance? The pricing page gives me no sense of scale and what size of instance I might need.