Technically, all video doorbell cameras are free to use devices after purchase. However, if you want to enjoy the full features that each type of equipment comes with, you may have to pay a monthly subscription. These features may include live streaming, instant messaging, pre-recorded voice messages and cloud access. Different brands have different subscription packages. Usually, subscription per month ranges from about $2 to a little over $30 per month. Paying for a year’s worth of subscription makes for a cheaper option.