Formesign does not offer a one-time purchase option. When you subscribe to the paid plan, you can either choose the monthly or annual option. Monthly subscription is automatically renewed each month. You can cancel it anytime. Annual subscription is a 12 month commitment and it is non refundable. If you need it for a short period, you can opt for the monthly subscription and cancel it after your desired usage. When you cancel your subscription, it will be valid till the end of the subscription period.