Price Per Size support
Email support is coming soon. In the meantime, the answers below cover the most common questions.
A shared link opened a web page instead of the app
Shared comparisons open in the app only when it's installed. Install Price Per Size, then go back to the message and tap the link again.
Restoring Premium on a new iPhone
Premium is tied to your Apple Account. In the app, choose Restore Purchases, signed in with the same Apple Account you bought it with.
Cancelling a subscription
Subscriptions are managed by Apple. Open Settings on your iPhone, tap your name, then Subscriptions. You can also manage it from the app's settings screen.