devCalc is one of the finest made calculator apps on the App Store, designed specifically for app developers to perform quick functions or swipe between different modes. While the free version lacks some of the more robust and impressive features of the paid upgrade, the app still manages to impress with its clean layout and numerous options in standard calculator mode.
The calculator, itself, expands on much of what the iPhone's base calculator does, with numerous additional functions and memory options. Combined with conversion tools for hexes, base eights, and binary and decimal numbers, the calculator works seamlessly for almost any of the various functions and calculations done regularly by software developers. The more robust features of devCalc are the sliding interface options to switch between modes quickly and to save calculations between screens. These require the paid upgrade, but for those that plan to use the app to its fullest, the upgrade is almost essential for the full experience.
If you are a software developer and own an iPhone, devCalc is a very well made app that will save you time and help you get more work done with your phone. Combined with a dock for immediate access to your phone while at the computer, it's a perfect companion to your development efforts, whatever they might be. This is one of the finer calculator apps on the App Store, regardless of the target audience.