None, we don't believe in evil contracts, rather we think all services should have a "no commitment policy" of cancel whenever the heck you want.
Cancel anytime and you will never be billed again.
In order to keep pricing to a minimum, there will be no refunds. This keeps pricing to a minimum because hiring accountants to return a $1.50 or some number between zero and five bucks is a silly expense that should not be passed along in the monthly cost to our users.