Looking at the screencast, it looked very well done and beyond basic. I think you are selling yourself short when you say it's basic and not professional. How

Looking at the screencast, it looked very well done and beyond basic. I think you are selling yourself short when you say it's basic and not professional. However, there are a ton of to-do apps -- many are free. I paid for the one I use because it's an iPhone app (Things). "Remember the Milk" is an example of a to-do app that has web and iPhone integration (and I think charges for both versions). Off the top of my head, your niche looks to be non-engligh todos (in particular, Portugese). There are a lot of free to-do apps, but maybe yours is popular in Brazil simply because of that edge. Start charging -- make a free plan that limits the number of to-dos so that people can still try it out and get some value. All current users should probably get the full version for free (for being early adopters) -- or at least of level that is equivalent to what they have now.