While iOS apps like Evernote and Instapaper are able to provide users with in-app auto-renewing monthly subscriptions for services, the same functionality is not available in the Mac App Store at the current time.
For example, Evernote is able to offer a renewable monthly subscription to its premium service via iOS, charging $5 per month. On the Mac App Store, however, Evernote cannot offer a subscription, instead requiring users to sign up each month or purchase a year of service in advance.
As 9to5Mac notes, that is set to change in OS X Mavericks, with the introduction of Auto-Renewable Subscriptions for Mac Apps.
Mac App Store subscriptions in Mavericks will be managed in the Mac App Store's account information panel, which has been updated with a new subscription management setting.
OS X Mavericks was previewed at Apple's Worldwide Developers Conference in June. It is currently available for developers, and is expected to be released to the public in the fall.
Article Link: OS X Mavericks Adds Auto-Renew Subscriptions for Mac App Store