No, but you can add the webapp or the offline app to the iOS and Android homescreen as follows. Use https://www.draw.io for the webapp and https://app.draw.io/ for the offline app, then click on "Add to home screen" in the browser menu:

 

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Here is an example of adding the app to your homescreen on iOS:

 

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More information about using the offline app is available here: Using draw.io in Offline Mode