Halcyon Calc vs SpicyRPN

For students, engineers, scientists or people who fondly remember classic calculators, Halcyon Calc is a great application for manipulating numbers and even symbolic expressions. Features: - Use this calculator on an iPhone, iPod Touch or an iPad - Use your finger to quickly scroll through the stack to review intermediate results - Copy and paste support - Over 225 built-in operations, including trig, logarithms, real functions, complex operations and more - Allows you to work with real, complex and integer numbers. - Real and complex numbers can be displayed in standard, fixed, scientific and engineering format - Use over 120 built-in units to perform unit conversion or create your own units if the one you want is not already there - Integer numbers can be displayed in decimal, hexadecimal, octal and binary bases - Work with real and complex matrices and vectors. - Enter symbolic expressions and solve them for different values. Even better, solve quadratic formulas, collect and expand factors and terms, find minima, maxima and roots of any expression. - Plot symbolic expressions in X/Y coordinates. Pan the coordinate space by dragging the plot in any direction. Zoom in and out using a pinch gesture. - Determine symbolic derivative, taylor series or numeric integral of an expression. - Store numbers, lists, strings and expressions in symbols. Create hierarchies of symbols to allow you to organize your calculations. - Create sequences of calculator commands into programs, creating your own operations which you can then include in expressions. - Store statistical data and calculate totals, averages, standard deviations, linear regressions, etc over that data. - Calculate the probabilities associated with standard distributions like the normal, F and T distributions.

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.