DoF calculator apps for smart phones

A while back I came across a website that calculates depth of field. The website, http://www.dofmaster.com/ , offers free downloadable apps for many phones. I had been wanting one but lacked the requisite phone. That is until recently. My trusty old Palm Treo 750, a Windows phone, developed a problem and my wife was tired of receiving texts that looked like ztzzzhizzzzs. I'm sure you can read between the Zs and so could my wife. But, she was frustrated with my sticky Z and so was I. She took it upon herself and bought my upgrade, a Palm Pixi. Imagine my elation when I browsed the Palm Store apps and found my DoF Calculator app for only $1.99. Yes, I mentioned free earlier, but as far as I could tell there weren't any available for Palm's latest OS on dofmaster.com. Besides, how often can you get anything photography related for a couple bucks? Of all the apps available to a photographer, I don't mind spending a little money on this practical doo-dad!