We launched Clear Check a few months back, somewhat on a whim. It was mostly paid for by a client who agreed to let us sell it to other customers in exchange for a sweet deal. In addition to the work out in to build it, at a reduced rate, I also put 20 to 40 hours of my own time in on top “productizing” it. We’ve been carrying the hosting and maintenance costs since as well.
We have finally got another customer and now are collecting $600 per year in additional revenue. It’s a good start!