If you are currently on the Pro recurring subscription plan, you may cancel at any time. Your recurring subscription is set up through PayPal during checkout. You will need to log into that PayPal account and cancel it, unfortunately you are the only one that can do this.
Step By Step Instructions
To cancel your subscription, log into your account page on My Account, locate the “Cancel Subscription” link below the Purchases box and on the right side of the screen. You may also directly visit your PayPal subscriptions page HERE.
Once you have logged into your PayPal account, you should be automatically directed to the “My preapproved payments” tab. Locate the merchant account and click on it, in this case: App Market Analyzer.
The next screen you should see is the “Subscription details” page. Click on the “Cancel” link in the upper left hand part of the screen.
Finally, head back to your My Account page to verify that this recurring subscription has been canceled properly.
Please note, whatever time you had left on your license will continue and auto expire when your next payment should have been due.