Basically to Loop you need a hackable pump, a CGM, an app on your phone and a gadget to talk to your pump.
For example, I personally use Omnipod, a Freestyle Libre+MiaoMiao, iPhone 8+ and a RileyLink on the hardware front. As I’m iPhone based, I also needed an Apple developer account and a Mac (I have a 2010 MacBook Pro, so pretty old), as you need to be able to build the app yourself. I also have a Fitbit Ionic watch so I can see my levels and what Loop is doing at a glance. You don’t need the fastest, most expensive equipment, I’m doing it on a very tight student budget.
There are different setups available for Android phones, I believe
@tim2000s is the person to tag here!