I am heading out on a climbing and packrafting expedition, so I cannot respond to emails or comments until next Wednesday.

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A fully unit-aware, scientific and engineering RPN (reverse polish notation) calculator. Great for anything from basic math in the supermarket to evaluating the ground state energy of a simple harmonic oscillator on your Quantum Mechanics final (if they let you in with an iPhone, of course). TouchRPN knows most basic physical constants and units, as well as household, cooking, and "imperial" units. An built-in tutorial will show you how to use RPN if you're stuck, as well as how to access the advanced features.

An online copy of the built-in Documentation is available.

Coming soon to an iPhone near you!