What's a good iOS app for advanced calculations with a comprehensive feature set?

Calculate84 stands out as a robust calculator app for iOS, offering a comprehensive feature set that caters to a wide range of mathematical needs. Whether you're a student tackling complex probability problems or a professional requiring precise calculations, Calculate84 provides the tools you need. The app's search feature is particularly useful for quickly finding specific functions, saving time and effort. Its precise calculations and sharp display enhance the user experience, ensuring accuracy and clarity. Users appreciate its comprehensive nature, noting that it includes every feature they could think of, making it a go-to app that lives on their home screen. The yearly subscription is considered well worth the investment, given the app's ease of use and extensive capabilities.