First paying customers

Mantra was a free application that had a very little revenue thanks to banner ads. But since the launch, it had around 200K installs, so, I decided to add some extra content like customizable themes, categories, background music, etc. Started offering these extra features and content under a subscription model. My purpose was to test in-app purchases and subscriptions. But, it literally blew my mind. Because I was thinking that it's very hard to make a revenue out of subscriptions.

In its first month, it earned ~3500 USD.