JLPT N5 Wordbook is not free (it costs 3.99), however it doesn't contain in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
The price of JLPT N5 Wordbook is 3.99.
To get estimated revenue of JLPT N5 Wordbook app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.