I think it would be a good idea ( and would make Pophie more accessible for more people) if the subscription was offered in both yearly and monthly payment options. Maybe give a small discount for choosing the yearly over the monthly or something like that. But I know a lot of people will have an easier time maintaining their subscription if there was a monthly option as well. The other thing is that there should be a way to upgrade your subscription between the tiers. Free to standard, standard to pro etc. Of course you would need to pay the difference between the two tiers, whether that’s an adjustment to the payment on a monthly or a yearly basis etc.