There are almost 7.8 billion people in the world, over 40% of which own a smartphone. In 2019, mobile users were spending 90% of their mobile time using apps. Add to that, the 1.35 billion people worldwide using tablets and you’ve got a very large captive audience ready to interact with your product, which makes 2020 a great time to be an app developer. If you want to take advantage of this multi-billion dollar opportunity, you need to have a…