• Global app revenue will double to reach $102 billion by 2020
• App developers have trouble converting users who download their apps into paying customers with less than 2% of global app installers turned into buyers
• Keeping users engaged remains an issue for developers
• Just over 10% of app users remain engaged with their apps just seven days after installing it, and only  4% after 30 days
• iPhone users are 80% more likely to make a purchase than an Android user (35%).

Via Business Insider