Thanks for sharing this! I'm also looking for an alternative to the official app, since having to log in with an account and accepting a privacy policy every time I want to change the time on my watch is pretty ridiculous – unfortunately I think this doesn't quite fit my use case as usually I'll want to sync the time when I go to a different country, and I'll normally only have my iPhone with me, which won't support WebBluetooth. But this tool might be a starting point to fork and build a capacitor app with that can run on the phone I suppose.