appfigures - Cross-platform app store analytics for all of your mobile apps.
APPlyzer - Professional rankings & keywords for app developers, marketers and publishers.
TheTool - App Store Optimization made simple and beautiful.
Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
App Annie - App Annie is a marketing analytics tool available for apps of all kinds. With App Annie, you can track sales, traffic, and a variety of other factors pertinent to monitoring an app's trajectory.
ASO by 2Stable - Find the most relevant keywords for your app