I paid for premium but I can't access premium features
If you paid for premium and still see the free version of Cardiogram after logging in, it's possible we missed the notification from the App/Play store when you made the purchase.
You can work around this by re-subscribing to Premium (you will not have to pay again). After seeing the prompt from Apple/Google indicating that "You have already subscribed to Cardiogram Premium" you should be able to log in and use the Premium features.
If you are still unable to access Premium features using this workaround, please contact Cardiogram support.