POWR is a cloud-based system of apps that work on almost any website. A POWR app will 'recognize' you as their owner based on your account details. So you can edit your apps, but no one else can.
You also need an account to view data for certain apps like POWR Form Builder.
Finally, POWR lets you edit and manage your apps on any website, from any computer, as long as you log into your POWR.io account.
Note: If you are using Wix, you do not need a POWR Account to use POWR through the Wix App Market.
Weebly, Shopify, Bigcommerce, and Webydo users have their account created automatically when installing POWR through one of those platforms.