You can view your iTunes spending directly inside Rocket Money on the mobile app. Here's how:
Open Rocket Money and go to the "Recurring" tab
Tap on the "All" tab
In your list, scroll down and tap on "iTunes"
From the iTunes page, you can see a historical chart of your iTunes spending.
To view the breakdown of your iTunes subscriptions and to cancel subscriptions, tap the "Manage Subscription" button on that page.
Note: You can only view these directly in the mobile app.