Yes, Spot the Difference: Farm is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
Spot the Difference: Farm has several in-app purchases/subscriptions, the average in-app price is USD 9.49.
To get estimated revenue of Spot the Difference: Farm app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.