Yes, XNSPY is using a recurring payment system which will renew your services on the last day of your subscription. XNSPY will send three notifications via email before renewing the service. First notification will be sent before 7 days of expiry, second will be sent before 3 days of expiry, and the last will be sent on the expiry date.
However, you can cancel auto-renewal option from your web account, anytime.