App only. I have no user id or password to do it online. I just downloaded the app and i guess it charged me thru my itunes account. When i go to subscriptions it just tells me im monthly and that it will renew automatically. Im not a tech genius but i can usually handle something like this.
I think if you can click on either monthly or automatic renewal it will give you an option to turn that off. That's what it did for me IIRC- I was a little surprised it gave me the option fairly easily.