2.6.1

• Added support for the iPhone 5 and new iPod touch.
• Added support for iOS 6.
• Improved the "Rough Draft" theme.
• Fixed a number of problems with the user constants editing.
• PCalc now requires iOS 4.3 or later - unfortunately Apple's developer tools for iOS 6 don't support older systems.

2.6

• You can now add and edit your own constants.
• You can now export user constants via email, and import them on other devices.
• User constants are synced across multiple devices automatically using iCloud.
• Added a density section to the conversions.
• Added all the functions from the Mac version - click the ƒ(x) button to access them. Includes "Complex Numbers" and "Financial" categories.
• On the iPhone and iPod touch, the AC function is now accessed by double-tapping the C button - needed to make space for the ƒ(x) button.
• You can now show up to eight lines of display.
• MC now lets you pick a specific memory if multiple memories are enabled.
• Made the currency conversion section more self-explanatory.
• The screen error flash is more visible again.

2.5.1

• Improved support for the Retina display on the new iPad.
• Added an indicator to the LCD (where there's space) to show Normal / Scientfic / Engineering mode. Tap it to switch mode.
• Significant performance improvements when entering numbers, particularly on iPad.
• The glow effect is back when using the Flynn theme on the new iPad.
• Fixed a problem with the pcalc://settings and pcalc://ac URLs.

2.5

• Added support for the Retina display on the new iPad.
• Added a "pcalc://" URL scheme - open that with no arguments to launch PCalc, or any of the following:
  pcalc://set/12345 - set the main register to 12345.
  pcalc://convert/12345 - set the main register to 12345 and open the conversions section.
  pcalc://constants - open the constants section.
  pcalc://tape - open the tape section.
  pcalc://registers or pcalc://stack - open the registers section or stack in RPN mode.
  pcalc://settings - open the settings section.
  pcalc://ac - clear all.
• With multiple memories switched on, the registers section now displays the grand total and you can M+ / M- / M in / M re all the memories at once.
• Added a new calculator theme, "Brawn".
• Added an option to set the upper value where scientific notation display starts.
• You can now use the minus button to change the sign of an exponent as you are entering it.
• Now strip underscores when pasting values into PCalc.
• Fixed a problem with thousands separators not showing on the tape, registers, and conversions.
• Fixed a problem with operator buttons not working.
• Fixed a problem with parentheses level indicator not updating when you hit equals.
• Fixed a problem with the Monolith font on iPad.

2.4.3

• Fixed a number of drawing problems on older devices such as iPhone 3G and iPod touch 2G.

2.4.2

• Fixed the horizontal line that appeared when using a split keyboard on iPad on iOS 5.
• Various other fixes for iOS 5.

2.4.1

• Added support for external hardware keyboards - there is a list of key shortcuts in the help section.

2.4

• Added a "Frac" button to most layouts for quick fraction entry. You can also press the decimal point button a second time.
• Added swap buttons in the conversion section to quickly set the base unit.
• Added a new "Lighting" section to the unit conversions with lumen, lux, footcandles etc.
• Added inch/mm of mercury and water to the pressure conversions.
• Added proper units to all of the constants.
• Added an option to disable Auto-Lock while PCalc is open.
• Added a new digit style, "Typewriter".
• The "Monolith" digit style is now available on the iPad too.
• Improved readability in the conversions and constants sections.
• Improved startup speed with very long tapes.
• Fixed a problem with the "shake to undo" gesture.
• Fixed a problem with the registers not opening on iPad.
• Fixed a problem with blank menus on iPad.
• Fixed a problem with the option to disable vibration on error.
• Fixed a problem with the "Copy On Close" option in the Advanced settings.
• Fixed a crash on rotation.

2.3.3

• Fixed a problem with the "Exp" button not working on some systems.
• Fixed a problem with the "2nd" button becoming highlighted after a rotation.
• Fixed a problem with the "Clear On Open" and "Paste On Open" options in the Advanced settings.

2.3.2

• Added an option for a fixed four register RPN stack with X, Y, Z, and T registers.
• Fixed a problem copying or emailing a tape containing hex, octal, or binary calculations.
• Fixed a problem sending emails on iPhone / iPod touch.
• Fixed a problem with zeros appearing in the RPN stack after unit conversions.

2.3.1 (Lite only)

• Fixed a problem with the thousands separator and multiple memory options not appearing after in-app purchase.

2.3

• You can now display the tape, registers, and RPN stack on screen all the time on an iPad in landscape.
• The tape and registers now reflect the appearance of the current theme.
• Improved the emailing of tape and registers.
• Added an option to show an editing cursor when entering numbers.
• Added new force and temperature unit conversions, with thanks to Georg Schober.
• Now always perform an integer divide in Hex, Octal, and Binary modes.
• When the RPN stack is full with 128 entries, pushing a new number will drop the oldest one.
• Fixed a rotation problem when opening PCalc upside down on an iPad.
• Significant performance improvements.

2.2.1

• Fixed a problem with background music stopping for PCalc key clicks.
  
• Fixed a crash that could occur with the constants and conversions.
• Improved support for the Retina display on the iPhone 4.
• Opening the conversions now finishes entry of the current number.

2.2

• Added a special low-light calculator theme, "Flynn".
• Added dozens of new unit conversions.
• You can now sort the units in the conversions section by name or by magnitude.
• Added a volume control for the key click sounds.
• Added an option to stop the "AC" button from clearing the memories.
• Added an option to show or hide the key popups.
• Added labels to the display on iPad in portrait mode.
• Moved the thousands separator option into the main settings section.
• Improved detection of overflow in Hex, Octal, and Binary modes.
• Improved speed of application switching on iOS 4.0.
• Various minor fixes and improvements.

2.1

• Added support for iOS 4.0 and fast app switching.
• Added support for the Retina display on the iPhone 4.
• Various minor fixes and improvements.

2.0.1

• Fixed a crash that could occur with the constants and conversions on iOS 4.0.

2.0

• Added support for the iPad.

1.9.3

• Fixed a problem with the currency conversions in some regions. Reload the rates if you still see problems.

1.9.2

• Added a brand new currency section to the unit conversions.
• Added "<< n" and ">> n" buttons to the programming layouts for shifting by an arbitrary number of bits.
• Fixed a problem with settings being reset occasionally.
• Fixed a problem with custom LCD colours not being saved.
• Changed the "Del" button to look like the standard iPhone backspace.
• Made the recent conversion swap buttons much easier to press.
• Various minor fixes and improvements.

1.9.1

• Added support for the standard "shake to undo" gesture.
• Added an option to stop the "AC" button from clearing the tape.
• Added an option to stop iPhones from vibrating on errors.
• Various minor fixes and improvements.

1.9

• You can now purchase all the extra features from the full version of PCalc from inside PCalc Lite. Buy them individually, or buy everything.
• Added a new calculator theme, "Flux".
• You can now customize the decimal and thousands separators in the advanced settings.
• You can now show thousands separators in the register, stack, and unit conversion sections.
• Added options to automatically copy and paste when PCalc is closed and reopened.
• When using multiple memories, the memory keys now highlight to show which memories have values stored in them.
• Gamma function now works on a wider range of inputs.
• Improved performance and handling of low-memory situations.
• Various minor fixes and improvements.
• PCalc now requires iPhone OS 3.0 or later.

1.8.1

• Fixed a problem in 1.8 with calculator buttons not always taking presses. †
• Various minor fixes and improvements. †

† Also in PCalc Lite 1.8.1

1.8

• You can now swipe up and down on the LCD screen to change the number of lines displayed.
• You can now separately set the number of lines displayed for the horizontal and vertical modes.
• You can now undo and redo calculations even after closing and reopening PCalc. †
• Added a mod operator as a 2nd function of the divide button.
• Added an option to set the lower value where scientific notation display starts.
• Improved support for VoiceOver. †
• Various minor fixes and improvements. †

† Also in PCalc Lite 1.8

1.7

• Faster startup! †
• Added three and four line display modes with full control over what's displayed on each line.
• Added an option to increase the number of available memories to ten.
• Added an option to stop the calculator rotating horizontally.
• Added an option to make the RPN behaviour match more modern calculators like the HP48.
• Added a "Last" button to the RPN layouts which pushes the previous value of X onto the stack.
• Added "SC", "CC", and "MC" buttons to separately clear the stack, calculation, and memories respectively.
• Added commands to copy the tape and RPN stack to the clipboard on iPhone OS 3.0.
• Added separate UK / US tablespoon and teaspoon units to the cooking conversions.
• Made the "Easier To Read" digit style actually easier to read. †
• Made calculator buttons easier to press. †
• Tidied up the settings.

† Also in PCalc Lite 1.7

1.6

• Added support for copy and paste on iPhone OS 3.0 - double-tap (or tap-and-hold) the LCD screen to copy the displayed value, or to paste in another one. †
• Added a new full-featured vertical layout, "Engineering", that includes all the functions from the horizontal equivalent - no need to rotate anymore.
• Added a new layout, "Programming", in both horizontal and vertical flavors, geared towards hex, octal, and binary calculations.
• Added support for regions that use a quote as the thousands separator. †
• Fixed a display problem with the tape in hex mode.
• Various fixes for iPhone OS 3.0. †

† Also in PCalc Lite 1.6

1.5

• Added a new horizontal layout, "Engineering", that includes hyperbolic trig functions, hypotenuse, leg, gamma, delta percent, and more.
• Added a new calculator theme, "Widget", taken from PCalc for Mac OS X.
• Added a choice of six different key click sounds.
• Made the dot and comma much bigger in the "LCD" digit style. †
• Now highlight buttons to show when you are entering a decimal or an exponent. †
• Made the recent conversion swap buttons much easier to press. †

† Also in PCalc Lite 1.5

1.4

• Added an option to show the most recently used conversions and constants for faster access.
• Added many more unit conversions including a new cooking section.
• Added four new digit styles to choose from.
• Added a splash screen to stop untidy theme switching at startup. †
• PCalc longer rotates when upside-down, so you can now use it when you are lying on your side. †
• More performance improvements. †

† Also in PCalc LIte 1.4

1.3

• Added a new calculator theme "Twilight" taken from PCalc Lite.
• Added small theme previews to the settings.
• Added "Newtons" to the weight conversions.
• The two-line display option is now much more responsive and shows the contents of the memory when not in RPN mode.
• Various performance improvements.
• Fixed a display problem with the parentheses buttons.
• Fixed a display problem with the "High Power" theme.

1.2

• Added an option to show a two-line display for use in RPN mode.
• Added two new calculator themes.
• Now use a comma or a dot as the thousands separator, when it's set to be a character we can't display.
• Changed the behaviour of percentage and delta percentage to match PCalc on Mac OS X.
• Fixed a problem with very large and small numbers not causing an overflow.
• Fixed a problem with first thousands separator sometimes not being displayed.
• Fixed a problem displaying the correct number of decimal places for some numbers.

1.1

• Added support for switchable button layouts - choose from many different horizontal and vertical layouts.
• Added support for calculator themes - comes with three new optional appearances with color-coded buttons.
• Added an option to show trailing zeros up to a fixed number of decimal places.
• Added an option to make the "2nd" button switch off automatically after the next button press.
• New horizontal mode layout with improved button placement and the number buttons on the right-hand side.
• Double height equals/enter button in all the default layouts.
• RPN mode is now a separate switch in the settings.
• You can now email the whole stack when in RPN mode.
• Made value text larger in constants and conversions section.
• Made the dot and comma larger in the "Easier To Read Digits" option.
• Changed "Exp" button to automatically insert a 1 before the exponent if no numbers entered.
• Percentage key now works more like HP calculators in RPN mode.
• Cube root now supports negative numbers.
• Factorial is now calculated using the gamma function.

1.0.2

• Added multiple undo and redo. Flick the LCD to the right on to undo, flick to the left to redo.
• You can now change the colors of the LCD display and digits.
• Made the operator buttons more readable.
• Reversed the order of the operator buttons to match other calculators.
• More improvements to the RPN mode.
• Fixed a problem displaying large hex numbers on the tape.

1.0.1

• You can now email the contents of the tape and the display.
• Changed the RPN Drop behaviour to match HP calculators.
• Rearranged layout slightly to show "Del" button in RPN mode.
• Added some fuel efficiency conversions.
• Added display of ASCII / UTF-8 / UTF-16 values.
• Added a Help section to the Settings.
• Now correctly disable the "8" button in octal mode.
• Fixed the RPN "Roll" button in horizontal mode.
• Fixed a couple of memory leaks.

1.0

• First release for iPhone.