Time-Calculator is a free iPhone application developed by Adrien Brecheteau. It falls under the category of Utilities & Tools and offers a convenient solution for adding and subtracting hours and minutes without the need for complicated conversions.

The app is designed to be user-friendly, allowing you to see your calculations in real-time as you input them. This ensures that you can easily keep track of your calculations, even during long additions. Additionally, Time-Calculator stores all your calculations in memory, so you don't have to worry about losing your progress when you close the app.

One of the standout features of Time-Calculator is its ability to handle calculations involving hundreds of thousands of hours. This makes it suitable for a wide range of scenarios, from simple time calculations to more complex calculations involving large time intervals.

In addition to basic addition and subtraction, the Premium version of Time-Calculator offers advanced functionality such as division and multiplication of hours and minutes. Furthermore, the Premium version does not display any advertisements, ensuring a seamless user experience.

With its intuitive interface and powerful capabilities, Time-Calculator is an essential tool for anyone who frequently deals with time calculations on their iPhone.