You want to convert your existing webapp into a real iOS and Android app? Probably there is no easier way than using WeSetupYourWebViewApp: Just define your URL, upload your icon and customize your settings and we take care of the rest.
WebViewGold: WebView for iOS and Android enriched with advanced features. Use many APIs like Image Saving or Push Notifications to create your own, professional WebView app. One of the “15 Best iOS App Templates of 2017" (envato tuts).