The easiest way to cancel a monthly subscription is to open the app, open the … menu, select Settings, and then select Manage Subscription. The app will open the correct manage subscription page where you can cancel your subscription.
The receipt email should also have links where you can manage and cancel your subscription.
If you do not have the app or the email, you must cancel your subscription where you purchased it.
Google Play
Manage Google Play subscriptions by clicking here or by opening the Play Store, tapping the account in the upper right, and Payments & Subscriptions.
Amazon
Manage Amazon subscriptions on Amazon.com.
Apple
For Apple subscriptions, enter the app store, tap the account in the upper right, and tap Subscriptions.
Snapwood Apps
In rare cases you may have subscribed directly from Snapwood Apps and can manage your subscription here. Some countries, such as Chile, Columbia, India, Mexico, Peru, Turkey, South Korea and Vietnam, might have subscribed using a different store that can be managed here.
Again, your receipt would indicate which store you need to use to cancel.