Bank credit cards allow you to establish transaction thresholds. If the transaction is over that amount, a notification is triggered. I'd like to monitor certain subscriptions that might have some monthly variances, but if those variances are over a certain threshold Rocket Money would alert me. Comcast/xFinity has some month-to-month variances, but they also sneak in substantive changes in the bill when you are on auto-pay and it would be great to detect those right away.