Freelancers are going to be really used to trying tech for free before buying. They are a good market for freemium or even ad supported.
Not sure about this one but to be honest I was distracted by that robot cartoon character. I'm not even sure what he has in his mouth. It's just weird and makes me think you are 17. Hope that wasn't harsh, I would wager there's an emotional attachment to that robot, you or someone close is a great artist. Ditch the emotion and get something more product specific.
As for the robot, I was going for something cute, like MailChimp. It was picture I took of a friend's painting. Awesome painting, but didn't translate well to a pro icon. Do you think a robot could work if I got a pro version done at Logo Tournament?
I do plan to make it easy to try it for free. Also make it much cheaper... say a flat $5/mnth or something.
I actually abandoned it over a year ago once I launched and realized there are 41394 invoicing apps and I don't know how to market.
haven't maintained it in ages though