IF YOU NEED a full-featured scientific calculator—or a great calculator for your iPad, which inexplicably doesn’t include one—TLA Systems’ $10 PCalc fits the bill. It’s overflowing with features, including scientific operations, conversions, constants, and user-defined functions, all presented in a highly customizable interface.
PCalc 3 adds many new features and an iOS 7–friendly design. It has the standard fare: inverse, root, exponent, and trigonometric functions; nested operations; decimal, hexadecimal, octal, and binary modes; RPN; and more. It has a time-stamped virtual tape for revisiting calculations, as well as a register that displays the memory’s contents.
PCalc provides preset conversions in a slew of categories, such as angles, area, bytes, cooking, currency, density, and energy. The most recently used conversions appear at the top of each list. If you don’t find…