I like all the things about this app including the vast choices and the ability to add your own. However the interface sometimes slows me down as I forget where a particular unit is located and have to search the index. It reminds me of searching through folders for a particular file. I would suggest some way to tag favorites so they can be easily located or even better, a quickfind text box for all the units. For instance if I wanted "cu yards", I could just type in "yard"
and it would select matching criteria.