You don't purchase Complyfile. You hire us to help you get a job done.
On the Flexible (monthly) plan, each month you can decide if you want to hire us again, or not.
The Annual plan helps us with our cash-flow when you pay us a year upfront, so in return for that commitment and demonstration of your loyalty, we give you two month's free usage of the software, which equates to a 17% discount on the equivalent value of paying for the software on a monthly basis (the Flexible Plan).
Hopefully it feels like a win for you, and a win for us; that's the idea anyhow.