The only supported Report Viewer that would work offline from the list below would be our WPF Report Viewer with an embedded report. The report would be delivered with the application and the engine would be embedded in the application.
Additionally, we don't have a supported Xamarin Forms, Flutter, Ionic or React Native Report Viewer which would also need to be used with either the WebView to load a HTML5 file or by Embedding the Reporting Engine. This means that it would not work offline if using the WebView but theoretically embedding the reporting engine could produce an export of a supported Rendering Extension that could be loaded in the application.
Please let me know if you need any additional information. Thank you for your interest in Telerik Reporting.
Eric R | Senior Technical Support Engineer
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