What are trial subscribtion restrictions.

Question

Hello, I'd like to know what are trial subscription restriction? How many API calls can I do and so on. Also as I found out threre is some kind of indie subscription for non-comercial apps. I read indie subscription has 1 million API calls. I don't need a lot of API calls for my app, because it is just demo app, where I show some mechanics inclide cloud data storage with app42 services. And I need only one not large JSON file to store. What should I do to get indie subscription, or some kind of free subscription for non-comercial single app.