Your credit card is only charged one month after you sign up. It is then charged at the beginning of each month for every consecutive month.
So if you sign up Sept. 1st, you have a free trial until Oct. 1st. On Oct 1st, your credit card will be charged for your iDoneThis service from Oct 1st to Nov. 1st.
As part of the slow web movement, we know that it takes some time before you know whether you're happy with our service. That's why we give you a one month free trial to see if you're happy with iDoneThis.