3lineProCalc provides a full-featured scientific calculator that uses the advantages of the touchscreen. It has lots of additional functions that make calculations easier & faster. If you're interested in 3lineProCalc you can first the try the free Version '2linecalc' which has the same user-interface but not as much functions. The multiline editfield is designed to 'tap' in the calculation according to the usual algebraic notation. Simply tap the [=]-button to get the result. The formula is cached in one of 10 'history-entries' and may be saved as a shortcut. In the new version it's also possible to send a history entry by email or via a messaging service. The result may be transfered into the editfield or one of 6 memory-entries for further calculations. 3lineProCalc provides several features via the app-menu: -Edit... - Enables the import & export of numbers via a display-tap. -Shortscuts/f(x)... - Sets the functions reachable to [Const./f(x)] (scientific mode), [usef.Conv] (useful conversions) or [user defnd.] (user defined). In the new version you have also access to a online ressource with more shortcuts that may copied. -Color themes... - Sets the design of the app. -Options... - Provides some options concerning the user interface (autoAC, AC-lock, disable landscape, education mode showing the handling of brackets step by step etc.) -Help - little manual There are also some special buttons: -[Const./f(x)] provides a set of useful math. functions and constants. This set may be changed to [usef.Conv] (useful Conversions) or [user defnd.] (user defined) by the menu-option 'shortcuts'. -[Sto/Rcl] (Store/Recall) Saves the number of the in one of 6 memory entries / Puts the desired entry into the editfield. -[dip] (Display input) inserts 'dip' for the number from the display line in the editfield. A doubletap of this button shows the value of the display directly. The user may also choose if he wants an 'autoAC' after each =-button or not.