Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
Optimizely - A/B testing you'll actually use.
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.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
appfigures - Cross-platform app store analytics for all of your mobile apps.
Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.