This is the license service. The XChange app talks to it when it opens: it asks whether the signed-in account may use the app, and what the account's plan gets.
Plans
- free — the app as it is, with your own accounts and keys.
- pro — free, plus the owner's models.
- ultra — free, plus the owner's models and their newest ones first.
Sign in
The app opens this page in your browser when it needs an account. The sign-in is Google's: the service asks for your address and nothing else.
The app on your machine: xchange. It asks this service before it serves anything, so an account without a license cannot use it.