I've been looking a long time for a decent calculator that I can leave running on the screen all the time. Micorsoft calculator is a joke. Other calculators have loads of buttons, take up too much space, clunky. Ultimacalc is neat, easy to use, stays on top of other programs. Doesn't look funky, but does the job great for me. Plus it does loads of other things too, like charts and graphs. But these are in other windows, and then they take up a lot of space. But thats good, I get large graphs. This program does a great deal more than it looks at first. Well woth the money.