Mary Meeker's annual Internet Trends report came out on Wednesday this week, and one section of it has a simple statement that sums up the mobile space: The easy growth is behind us. In developed countries, companies battle over existing users as market penetration nears 100%. In developing countries, poor Internet infrastructure, slowing growth and an uphill battle to "connect the next billion" means that reaching new users is harder than ever.

Though engagement rates remain low, the mobile marketplace appears to be recovering from a paralyzing app glut. That's according to new findings from analytics firm Localytics, which processes around 120 billion data points per month.