Iconic and powerful, Legendary 67 brings back the spirit of the legendary hp67 calculator. This iPhone app is a scientific and programmable calculator that allows you to perform calculations step-by-step using reverse Polish notation (RPN). With RPN, you have complete control over your calculations and can easily catch mistakes early on. It also offers a simpler alternative to algebraic calculators, requiring fewer keystrokes.

Legendary 67 makes it incredibly easy to create your own programs. You don't need to learn any programming languages - the calculator simply records the keys you type and can replay them when needed. With features like conditions, subroutines, and flags, you can create a wide range of powerful programs. From simple snippets like the Pythagorean theorem to complex matrix algebra and even games, the possibilities are endless.

This calculator comes equipped with a selection of useful pre-installed programs, and you can easily create your own programs too. Each program is stored on a virtual magnetic card with customizable labels and descriptions. And the best part? Legendary 67 is completely free and ad-free.