Touch 11i is an RPN scientific calculator. This app implements many features of the beloved HP-11C plus some extras.
The interface is the cleanest possible: just the calculator filling the whole screen. The app supports three numeric formats: American (999,999.00), European (999.999,00) and Indian (9,99,999.00), and supports copy of the value to the clipboard. Touch the left upper corner of the calculator to open the menu and get access to these features.
Other features: portrait layout, quick guide, saving memory images, 100% fullscreen, keyboard feedback, and more.