Excellent idea
May Allah reward you copiously for your efforts.
Yes, Halls4Jumuah is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
Halls4Jumuah is free.
To get estimated revenue of Halls4Jumuah app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.
May Allah reward you copiously for your efforts.