ASO (App Store Optimization) is essential for increasing an app's visibility, downloads, and rankings in the app stores. It involves setting up the app with relevant keywords, descriptions, and other details to make it more discoverable. Experts or tools like App Annie, Sensor Tower, Powering the discoverability of innovative mobile apps, Deep App Store Optimization and App Ecosystem data., StoreMaven, Appfigures, TUNE, AppTweak, App Radar, Apptopia, Priori Data, yellowHEAD, Gummicube, TheTool, SplitMetrics, Best self-serve A/B testing platform, SearchMan, Real-time monitor for users reviews, RankMyApp, Metrics Cat, Meatti, CodeNgo, and Refection can help optimize app store performance. These tools provide various features such as keyword ranking tracking, analysis, ASO in the iOS App Store & Google Play Store, predictive testing machine learning algorithms, market research, A/B testing, organic traffic monitoring, user reviews analytics, artificial intelligence, self-publishing services, and stability and performance monitoring to help developers increase their app's visibility and downloads.