Your Postfity subscription won’t be automatically cancelled. You must actively cancel your Postfity account.
Keep in mind that if you migrate to Simplified, you will need a new subscription on Simplified. Your Postfity subscription doesn't automatically grant you access to Simplified. If you decide to keep both subscriptions or don't cancel your Postfity account, you will be charged for both plans.
note: If you want to import your Postfity posts into your Simplified account, follow these steps.