Rechenknecht is a free and ad-free calculator app designed for iPhones and iPads. Developed by BippesBrandao GmbH, it is a versatile app that helps you perform various types of calculations quickly and easily. The app has a user-friendly interface that allows you to navigate through the different calculators with ease.

Rechenknecht offers a wide range of calculators, including mortgage, loan, and salary calculators, as well as percentage, inflation, and unit converters, among others. It also features a new addition, a basic calculator, which makes it an all-in-one app for all your calculation needs. The app is growing with its tasks, and you can contribute to its development by suggesting new calculators through the feedback option.

Overall, Rechenknecht is a handy app to have on your device if you're looking for a reliable and efficient calculator app. It's available for free and without any ads, making it an excellent option for anyone who needs a go-to app for quick and easy calculations.