No, Trigonometry Help is not free (it costs 7.90), and it also contains in-app purchases.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
Trigonometry Help costs 7.90 to download (and they also have additional in-app purchases).
To get estimated revenue of Trigonometry Help app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.
Chart
|
Category
|
Rank
|
---|---|---|
Top Paid
|
|
35
|
Top Paid
|
|
54
|
Top Paid
|
|
77
|
Top Paid
|
|
194
|
Top Paid
|
|
206
|