TLA Systems has announced a special free version of their PCalc
scientific calculator. It’s available to download today from the
Apple App Store

Available for a limited time only, PCalc Lite is a fully functional
version of the scientific calculator for the iPhone and iPod touch.
It includes an optional RPN mode, multiple undo and redo, unit
conversions and constants, as well as two themes. The full version
has many more settings and themes, a paper tape, engineering and
scientific notation, and full support for hexadecimal, octal and
binary calculations.

In the continuing absence of demos or trial periods in the App Store,
the idea behind PCalc Lite is to provide something useful and free
that’s better than the Apple calculator, but which will also drive
interest in our full version. PCalc Lite is a great calculator, but
PCalc is even better, says James Thomson of TLA Systems.