Ragot said new dev teams can even just focus on one metric: “If there is one KPI, according to my experience, that tells you everything, it is “Retention at Day X”. D1 retention is how many people come back to your app in the same day after they install it. I am always looking at D1, D3, D7, D14 and D30. If you put all of your effort into measuring this, you have good analytics that is a mix of retention and acquisition.”
Increasing user acquisition for your app starts with app store optimization. 30% of downloads occur after someone has searched by keywords in Google Play. So getting noticed within the app marketplace can already drive up user downloads before looking at any other type of promotion.