SwiftCalc for Mac provides a number of powerful calculator tools in a single interface for Mac users, including both standard scientific and programmer-based calculator layouts. The result is a tool that can be used by different types of users or by those who need different types of calculators. As a purely functional calculator, it works exactly as advertised, offering plenty of options in a free package.
After installation, you can load SwiftCalc quickly from the Applications folder or you can add a shortcut to the desktop or dock for easier access. It will load by default to the scientific calculator, but you can switch to programmer mode by clicking the button at the top left. There are also buttons to switch between decimal, hex, oct, and bin, and a huge range of buttons on the left for mathematical and scientific formulas. This can actually be confusing if you don't know what each of these buttons is designed to do. There are not a lot of options here beyond what you can see on the screen, nor is there a tutorial, so if you don't know how to use these functions or this type of calculator already, the app will be overwhelming.
Designed for those that need an accessible calculator with multiple options onscreen at once on their Mac computer, SwiftCalc is a powerful tool. It's not necessarily better or more feature-rich than other free calculators on the App Store, but it works smoothly and it is free, making it a good option if you need and already understand these functions.