1.6 Lite

• 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 support for regions that use a quote as the thousands separator.
• Various fixes for iPhone OS 3.0.

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.

1.5 Lite

• Added a choice of two 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.

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.

1.4 Lite

• Added an option to turn off the key clicks.
• 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.

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.