APPlyzer - Professional rankings & keywords for app developers, marketers and publishers.
Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
42matters - 42matters offers top-notch app market data and audience data that helps you to build your business around mobile. All mobile data is easily accessible via our REST API and easy to use Explorer.
ASO by 2Stable - Find the most relevant keywords for your app
Mobile Action - Mobile Data Intelligence & Actionable Insights.
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.