Please be honest with your customers
As soon as you push the “on” button (again nicely designed interface) a pop-up screen “invites” you to subscribe or it will not work.
This app is unless you buy a subscription.
I probably would have bought a subscription had I been allowed to trial.
Please change your mindset.
Response from developer
Hello, We're sorry you don't like our app. You can read the unsubscribe instructions here https://support.apple.com/en-ca/HT202039 If you have any more questions, please contact us.