Thank you for making clear how it works, as that was not directly clear. This is one of the problems with granting access tokens.. there's no way of knowing what'll happen with them.

Why not just release a macOS version on the appstore? Or, if you've created a swift version anyway, use that codebase for a universal app? There are also quite a number of apps that allow myself to 'convert' it to a 'native' app, with the exception of some features of course (such as global hotkeys).

Both desktop and webapp versions don't work for me (401 from google apps, not gmail), and show a blank screen. Login -> uncheck some checkboxes -> retry and check the boxes -> still blank.

Note: This could be create completely (afaict) using the built-in cal/task integration features of macOS/iOS, and would allow you use all supported calendar/task-services. For example, noteplan simply uses that, and will support dropbox as storage in later versions I think (it was removed from the beta version)