Very useful! It can't replace completely a normal calc, but it surely gives something no other calc gives. It is very useful, very friendly.. I just wish they add global shortcut to show/hide the app and also ability to remove it from the dock and move it as tray icon or hide it complete, so only the global shortcut can call the app.

Great calc, use it almost everyday for different calculations. But it needs some improvements of stability.

This little app is a great concept. However, currently the application does not have any online help, or a cheat sheet giving hints of the ways to calculate. At the moment you pretty much have to refer to the screenshots in the App Store. Thus the lower rating.

This app is fantastic! It handles variables very well, and the included tutorial makes everything super clear. The ONLY thing I don’t like is how it handles—or rather doesn’t handle—percentages in results. For example, 2/4 returns 0.5, but there doesn’t seem to be a way to make it show as 50% instead. Even worse, it also doesn’t cancel out units like $ when dividing, so $2/$4 returns $0.50 instead of 0.5, which is incorrect and confusing. Other than that, though, I haven’t really found anything else to complain about. Great app!