Function Calc

A full-function, programmable, graphing scientific calculator designed to be very quick and easy to use, but with the added power of customisation.  Tape display is visible while you type, and a swipe away from full screen view.  Select and directly input any number from tape, undo or edit calculations.  Easily create and use custom functions, store equations and useful numbers, use complex functions with multiple variables - fully programmable.  Plot functions on a zoomable graph, export a high-resolution pdf copy.  Dictate calculations and numbers for statistical analysis, with instant results. Completely free.

• no adverts, no in-app purchases.
• full set of scientific functions, unlimited nested brackets.
• swipe to undo, step by step.
• easily edit calculations and re-calculate.
• optionally enter and edit calculations in standard maths format, rather than calculator order.
• visible memory store.
• tape output shows all calculations – swipe for full screen.
• never type the same number twice – direct input from tape.
• zoomable text for easy reading and editing.
• fully editable useful numbers page – store constants, conversion factors, commonly used numbers, tappable URLs or email addresses, or any text.
• create, store and use functions for unit conversions or calculations, as simple as copy and paste.
• dictate calculations, or lists of numbers for statistical analysis, get instant results.
• create, edit and use complex functions with up to ten inputs or outputs – solve quadratic and cubic equations, calculate mortgage payments, compound interest, body mass index, triangles, the day of the week for any date, sunrise and sunset times and direction for any date and place, statistics (including normal, Student's T, Chi Square and F cumulative probability functions) and more – create or keep exactly what is useful, edit or delete what isn’t. 50 functions included. 
• fully zoomable graphing capability, plot one or two functions on a graph.  Export PNG or high-resolution large pdf copies.
• ideal for complex or repetitive tasks – custom functions reduce errors.
• full help included.