All RohuStudios apps are free to download and use, fully functional. I believe all software should be free to use. I make a small amount of revnue from ads, which helps pay for the costs associated with releasing apps -- Apple developer membership fees, domain registration fees, web site costs, etc. I write apps in my free time for fun; I work long hours for giant multinational corporation on weekdays to feed my family.
Through my apps I hope to give back. Whatever profit I make from apps, I plan on giving 25% to charities that help to educate and promote the sciences and engineering. In the event that I should ever have a profit, I plan on using this page to discuss where the money is going.