Unrelated to the app itself, but the website, the use of the word "feedbacks" seems pretty weird. (Are you a non-native English speaker?)
Sharing & Feedbacks
Share your prototype with colleagues and friends. They
can try out and comment on your prototype on their
iPhone, iPad or in web browsers. You’d be surprised
how valuable their feedbacks are.
I would recommend using the word "feedback" instead. e.g.: Sharing & Feedback
Share your prototype with colleagues and friends. They
can try out and comment on your prototype on their
iPhone, iPad or in web browsers. You’d be surprised
how valuable their feedback is.