EasyShares is an app. You just won't find it in an app store.
It's a web app you install to your home screen, straight from your browser. It gets its own icon, opens full screen and sends notifications, like any other app.
Why isn't it in the App Store?
Apple and Google don't allow adult content in their stores, and EasyShares is built for OnlyFans creators. So instead of downloading it from a store, you add it to your phone from this website.
Is it safe?
It can't read your contacts, photos, files, messages or other apps. Notifications are the only phone feature it uses.
How to install it
iPhone: open easyshares.net in Safari, tap Share, then Add to Home Screen. Android: open easyshares.net in Chrome, tap the three-dot menu, then Install app.