You have the choice. If flexibility is key for you, then we recommend our monthly subscriptions.
This is why PRTG Hosted Monitor is pre-billed monthly based on the pricing plan that you choose. If you subscribe to a plan, your credit card is charged up front with the monthly costs and you can use PRTG Hosted Monitor for one month. You can switch plans at any time. The balance on your account will be credited towards the new price. For example, if you select a new plan that costs half as much as the one you originally chose, you can use PRTG Hosted Monitor for a second month without being billed. If you switch plans during a month, you will be billed in part.
If you would like to plan ahead, our annual subscriptions are the way to go for you. You pay upfront for a whole year and besides credit card as payment method, you can also request Purchase on Account.