It looks an awful like the one that's right there in iOS - are you sure that Apple isn't going to go after this? I mean, it's very similar in look, even with the name.
Is it something that really needs a premium version?
Is it something that really needs a premium version?
Besides, in terms of features, UI, etc. the app is different and does not target the same platform.
The premium version is there to pay the different fees I have to maintain the app (domain name, Firebase, translation in other languages, etc.). It is far from paying bills.