If you are solving science and engineering problems, you need a real calculator. With its choice of two ergonomic keyboard layouts, its ability to handle arbitrary combinations of units, and its seamless integration of complex numbers, Numerari sets new standards for ease of use, unit conversion, and engineering applications support. Numerari is designed for both the iPad and iPad mini.

(Be sure to VISIT OUR SUPPORT PAGE for many more screen captures and expanded explanations of features.)

KEYBOARD
● The option to switch between two ergonomic keyboard layouts lets you decide which is best for how you use your iPad
● 10 user-defined keys that you can assign with a simple drag and drop---save special constants, groups of units, and expressions
● Slide finger on keyboard to move cursor rapidly
● Touch side bars to jump the cursor to the extreme left or right
● UNDO/REDO the last 50 edits in the build display
● 17 color themes: cool, warm, outdoors, orchid, sweet, chocolate, steel, graphite, robust, khaki, pastel, subway tile, sapphire, turquoise, ruby, emerald, and neutral

ADVANCED FUNCTIONS
● Popup keypad with 48 advanced functions
● Includes permutation, combination, factorial, double factorial, gamma, log gamma, digamma, log with any base, Riemann zeta, and error functions
● Includes all of the trigonometric and hyperbolic functions and their inverses
● Supports differential equation applications with Bessel and Airy functions and Legendre, Laguerre, Chebyshev, and Hermite polynomials

UNITS
● Popup unit keypads with 96 units
● Combine units with multiplication, division, and power operations
● Conversions for any physical quantity can be made by combining units
● Includes all metric (SI) units and many related units
● Popup prefix keypad has 18 metric power prefixes: centi, milli, micro, etc.
● Includes 48 of the most common English units
● Checks calculations for unit consistency
● Can suggest units for the answer after analyzing potentially thousands of possible unit combinations in a fraction of a second
● You can also specify the answer units---answer units are checked for consistency and any required unit conversions are done automatically

CONSTANTS
● Popup constant keypad with 48 physical and mathematical constants
● Covers the full range of areas from basic physics and chemistry to electromagnetics and quantum mechanics
● Option to turn off units on the constants if you are not using units in your calculations

DISPLAY
● Scrollable build display lets you enter calculations of arbitrary size
● Scrollable, 35 entry history display saves your previous calculations
● Copy from the history display to the build display with just one tap---copy the entire previous expression, copy a number with its units, etc.
● Delete a history entry with one tap (option to confirm history deletion)
● Unique ability to combine the ease of algebraic entry with clear, two-dimensional mathematical formatting so there is never any doubt about your calculation's structure
● Archive or email history images with different background and alignment options

COMPLEX NUMBERS
● Enter any mixture of rectangular or polar complex numbers in a calculation
● Complex numbers can have units
● Imaginary unit, i, can be used in its general mathematical sense not just as a part of the rectangular form
● One tap switches between rectangular and polar as the default answer form
● One tap switches between radians and degrees as the default polar argument units
● If the last answer was in rectangular form, one tap shows it in polar form and vice versa

NUMBER FORMATTING
● When a calculated number is copied into other calculations, it remembers its full precision regardless of how it was rounded for display
● Scientific and Engineering formatting modes

KnowledgeDoor has served the scientific community for over eight years, and its website was rated "Highly Recommended" by a review in "Choice: Current Reviews for Academic Libraries", February 2013.