Driving app downloads and retaining users are among the biggest challenges facing developers and marketers, especially in today’s overcrowded marketplace.

There’s an estimated 2.2 million apps in the Apple App Store alone, with another 2.8 million in the Google Play store as of March 2017.

Ensuring that app download numbers are up and user engagement is created is crucial to the success of any app, but at least 90% of new users are lost within the first 4 weeks and...