Developing for Fitbit and Apple WatchOS

[BamaBob]

Has anyone developed watch faces or apps for both Fitbit and Apple Watch?  I've developed an app for Fitbit, and now my wife is defecting and getting an Apple Watch Series 3, and I would like to port my app over to Apple.  I know this is not a simple task, but I was wondering what tools may be available that might make the translation a little easier.  One caveat is that I would be developing on a Windows machine.  Also, this would strictly be on the watch, I have no need or desire for a companion app.  I have found React Native and PhoneGap, just wondering if one of those or something else would be better and allow for more of my code to be reusable.

Thanks,

Bob

[JonFitbit]

They are both very different environments and you're unlikely to be able to share any common code. We use JavaScript, Apple uses Swift.

For Apple development questions, I'd recommend their forums.