When you subscribe to a Yapp plan, we default turn auto-renew on so that you don't have interruption in service if you don't want to.

In order to turn auto-renew off, go to your plan settings in Account and toggle auto-renew to off.  
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PLEASE NOTE: if you have auto-renew set to off on the day your subscription expires you will lose access to Yapp and your apps will be archived.