You will need the following equipment:
A food scale. Nothing fancy; just a scale that weighs food to the nearest gram.
Check out some of these basic food scales.
A bathroom scale. Again, nothing fancy, just a digital scale that will let you weight yourself so that you can tell the app what you weigh and it can adjust your diet from there.
Check out some of these basic bathroom scales.
Access to training equipment. We highly recommend you train at a commercial gym, as the equipment there will allow you to get your best results in fat loss and muscle retention or gain. If you train at a non-commercial gym, like a box, or even in your own home, that's just fine. Can you use this app without training at all? Yes, but results will be highly limited.