TheStateofAppEngagement2021—AnAnalysisofKeyGlobalAppUsageTrendsin2021©2021SensorTowerInc.-AllRightsReservedTheStateofAppEngagement2021IntroductionThisreport,whichleveragesSensorTower’sUsageIntelligenceandStoreIntelligencedata,exploresvariousappengagementmetricsoniOSandAndroid,includingactiveusers,sessionmetrics,andretention.Theanalysisincludestrendsandbenchmarksamongtopapps,whileengagementmetricsarealsoanalyzedbyappcategoryandmobilegamegenre.Non-gameappsareclassifiedbytheirstorecategory:•SomeappshaveanumberofdifferentversionsacrossApple’sAppStoreandGooglePlay(FacebookandFacebookLite,forexample).AppsareclassifiedbytheprimaryAppStorecategoryorGooglePla...