calc is my custom scientific calculator, which I created since no existing calculator app had all the features I wanted, and most attempted to simulate traditional physical calculators. It's too cumbersome.
calc focuses on parsing full math expressions instead of sequential operations. This is much more convenient in a device that has a general keyboard.
calc supports command-line expressions, custom functions and variables, many physical constants, chemical and astronomic data and arbitrary unit conversions.
A planned future version will include dimensional analysis and symbolic algebraic expressions.