Popular scientific calculator app PCalc was updated today with new features including 64-bit support for the iPhone 5s and new iPads. The updated app also includes a new nighttime theme on iOS 7 called “Samurai Night” that can automatically switch on when it’s dark.

Along with PCalc, we’re also huge fans of Digits Calculator in iOS.

Version 3.1 of PCalc for iPhone and iPad also includes a long list of other new features and fixes:

What’s New in Version 3.1

Added 64-bit support for the iPhone 5s and new iPads.
Added a new darker iOS 7 theme, “Samurai Night”.
Added an option to automatically switch to “Samurai Night” when it’s dark outside.
Added an accounting mode that automatically enters a decimal point and rounds the display to two decimal places.
Added an option to make the text on the keys bold.
Added new commands to the user functions and conversions.
Now display dark menus on an iPhone when using a dark theme.
Now disable the deg / rad buttons when not in decimal mode.
Now support touch typing using VoiceOver.
Fixed a problem adjusting sliders using VoiceOver.
Fixed a problem displaying the tape and registers in certain themes.
Fixed a problem hiding the status bar.
Fixed a problem with double-height status bars.
Fixed the sorting in the “Density” section of the conversions.

PCalc 3.0 is available for $9.99 on the App Store.