Yes! Once you've signed up for the Annual Membership through masterclass.com, you can cancel the auto renewal at anytime by heading to https://www.masterclass.com/account/edit. Select Cancel button in the Subscription Section of the page. Cancel subscription page will appear. On the page , select Continue to Cancel. Your account will not renew at the end of your current subscription period.
For in-app subscriptions through Apple or Google Play, cancelations can be managed through the respective App stores in the subscription sections.