Michal Subel
Michal Subel reviewedNumiA beautiful calculator app for Mac
 RecommendedPros: 

+Fast keyboard input

+Text parsing allowing to mix text and numbers

+Tons of conversions: currencies,units (incl. css),time-zones,etc

Cons: 

nada

I have this app launched almost all the time and reaching out for it for any ad-hoc calculation needs. I love how forgiving the input is allowing me to mix text and numbers and still get the right result. One of my essential tools.

Michal Subel has used this product for one year.