SpicyRPN

SpicyRPN brings the feel of a classic calculator to iPhone and iPad, with high-precision arithmetic and a comprehensive collection of scientific, statistical, and financial functions. Choose Reverse Polish Notation (RPN) for direct stack-based calculation, or algebraic entry for familiar expressions with parentheses. Switch between modes while keeping your work. • High-precision mathematics Adjust working precision independently of display formatting. Use fixed, scientific, or engineering notation to suit the calculation. • A flexible RPN stack Choose a fixed stack depth or an unlimited stack. Inspect its contents, rearrange values, and recall previous operands with Last X and Last Y. • Scientific and complex calculations Work with powers, roots, logarithms, trigonometry, hyperbolic functions, factorials, gamma functions, and more. Enter and display complex numbers in rectangular or polar form. • Financial tools Calculate time value of money, loan amortization, net present value, internal rate of return, bond price and yield, depreciation, and date differences. • Statistics Accumulate observations and calculate means, sample standard deviations, linear regression, estimates, and correlation. • Unit conversions Convert between units across a wide range of measurement categories, including temperature, length, mass, volume, and energy. • Memory and continuity Store values in numbered memories or retrieve them by numeric keys. Your calculator state is saved automatically so you can return to your work. • Designed for learning and daily use Use portrait or landscape layouts, built-in function help, and a detailed manual with worked examples and mathematical references. SpicyRPN is open-source software. Visit spicyrpn.com for the manual and release-specific source code.