I'm working on a new web app right now and am trying to figure out what the best way is to charge for it.
For my previous web apps, I charged the user once when they signed up. There were no recurring payments. I reasoned that for the type of web apps I build -- tools -- that most people would prefer one larger payment vs a recurring small one.
I've been discussing it with a few other folks and they're encouraging me to try a monthly payment, pointing to the success that 37signals has had with it. Less people might sign up, but over time the extra revenue you make from them will make up for it.
I tend to to think of apps like Photoshop, Textmate, and Transmit and think "A recurring payment? No way." And yet somehow when I think of 37Signals, it doesn't seem so bad, but I can't put into words why one makes sense and not the other.
How do you decide? Has anyone tried both and compared the numbers?
It's for that reason that paying for a webapp one time feels odd to me. It's like purchasing a product, except the product can be taken away from me at any time, which is unsettling.