The Web App has recently been released and is currently under development to include all the products and features which are available on the mobile app.
The app is supported on any browser and can be accessed on mobile devices, or a desktop computer.
You can login to the same account on multiple devices including the Web App.
Sign in to the Web App here - popsa.app/sign-in
Note: Logout of the Web App before opening the design on the mobile device to ensure all of your edits are synched correctly.
Alternatively, download the mobile app to your device.
From your Android device visit the Google Play Store.
From your iOS device visit the Apple App Store.