If your app is going to be available for free or run on a freemium model, you’ll need to think about hooking up with some advertising networks. These guys will help you monetize your app by running on-screen ads. There is no shortage of ad networks to choose from, but it’s best to stick with the well-established options such as AdMob, AppLovin, Media.net, Chartboost, Unity Ads, and the Facebook Audience Network.
Finally, set up analytics so that you can collect data to find out who’s using your app and which parts of the app are most popular. This data can be used to improve app performance and offer a more personalized experience.
Mixpanel, AppsFlyer, Localytics, Countly, and Google Analytics are the best options currently available. Mixpanel is the most advanced and intuitive platform, but if you’re looking for a free option, Countly and Google Analytics are solid choices.