What is the best time for integrating Ads
So I'm just wondering, if I make a free app with ads for revenue stream, what is the indicator that the idea is validated (people want to use it) and what is the best time for monetizing it ?
So I'm just wondering, if I make a free app with ads for revenue stream, what is the indicator that the idea is validated (people want to use it) and what is the best time for monetizing it ?