Just a lightning wallet you can connect via NWC. If you have Alby hub and alby account, you don’t need it
so I can only connect it to my Alby Wallet - not any other?
Yes. It is just an app that connects to your alby hub which is connected to your alby account. If you running alby hub, you can access it through a browser already, without the need for an app. The app just make it easier but functionality wise, it is the same