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(I still have a soft spot for Twilight and High Power, which remind me of my old HP RPN calculators.) And if you prefer using a Some of the new themes are decidedly iOS 7-influenced, but the developer has also kept the older themes around if you prefer the retro look. (On the iPad, I use Basic for my vertical layout, and the default scientific layout for horizontal orientation.) (The iPad’s larger screen accommodates more keys, so there’s less need for different key layouts-the iPhone layouts each contain a different subset of keys.) The app can even automatically switch to a darker theme at night, and there’s a nice Basic key layout that hides most of the extras for everyday use. You can customize PCalc’s overall appearance via thirteen different interface themes and a number of key layouts: three vertical layouts and three horizontal layouts on the iPad, and eight vertical layouts and ten horizontal layouts on the iPhone. PCalc’s Twilight theme on an iPad in RPN mode: the basic layout in portrait orientation (left) and the standard layout in horizontal orientation with the Stack sidebar visible (right) And PCalc supports undo and redo via dedicated buttons, screen swipes, or (for undo) a gentle shake of the device. You can copy results from the display for pasting elsewhere, and you can paste numbers copied elsewhere to use them in your calculations. You can also change the background color and the font and color of the digits. Speaking of the display, PCalc’s “LCD” is highly configurable: You can choose the number of lines (with separate settings for horizontal and vertical orientations), and choose what each line is used for (for example, for particular registers or stack levels)-you can even two-finger swipe up or down to view fewer or more lines, respectively, on the fly. Choose any constant, and it’s entered in the main display. Tap the 42 button-because what more important constant is there?-and you get quick access to known parameters in seven basic categories: astronomical (for example, the radius of the earth and standard gravity), atomic (e.g., the Rydberg Constant), electromagnetic (e.g., elementary charge), mathematical (e.g., pi, e, and the golden ratio), physicochemical (e.g., Avogadro Constant), universal (e.g., the speed of light), and user (those you’ve added manually, though you can also add your own constant to any of the other categories). If you frequently use scientific and engineering constants, there are plenty of those, too. Again, you can add your own here-more on that below. These are sorted across six categories: Complex Numbers (for example, finding the square root of ), Financial, Memory (functions that use numbers stored in memory), Special (for example, for finding permutations), Trigonometric (calculations beyond the standard trig-related buttons, such as the hyperbolic cotangent), and User. The app also includes a generous assortment of predefined functions, which are more-complex calculations. For many people, PCalc’s conversions feature alone will be worth the price of admission. If you don’t find a particular conversion listed, you can add your own. You can sort each list of conversion options alphabetically or by size, and the most-recently used conversions in each category are conveniently listed at the top of the list. You see a list of your measurement converted to every available unit of measure tap Feet and the result is entered in the main display. For example, to convert meters to feet, you enter the number of meters, tap the Conversions button (labeled A>B), tap Length, and then tap Meters. To make it easy to perform common calculations, PCalc provides preset conversions in a slew of categories: angles (for converting between six units of angular measurement), area (12 units), bytes (13), cooking (15), currency (33), density (6), energy (14), force (8), fuel efficiency (8), length (14), lighting (12), power (10), pressure (11), speed (11), temperature (5), time (9), torque (4), volume (17), and weight (10). Using PCalc’s Conversions feature on an iPhone to convert 42cm into other units

There’s still a time-stamped virtual tape for revisiting (and sharing) your calculations, as well as a register (called the stack in RPN mode) that displays memory contents and decimal-, hex-, octal-, and binary-base versions of the current number. As with the previous versions, you get all the standard scientific-calculator fare: inverse roots exponents trigonometric functions nested operations decimal, hexadecimal, octal, and binary modes RPN (Reverse Polish Notation-both HP and non-HP versions) and much more.