This is the ad-free version of uCalc, the easiest to use scientific calculator. By removing the adds you have more room in the history region for answers. Because of this, we added options in the iPhone settings to control display of the answer line (see images below).Large colored buttons (customizable), recallable paper-tape history, trig/log/exponential using radians or degrees. You can control the number of output digits and whether display should work in landscape mode.FEATURESDisplay sin portrait and landscape mode (landscape is controllable).Answer/message line can be optionally turned off for extra history lines.Large buttons - Color coded by category.Button color changeable to custom value.Uses localized language number format defined on your iPhone.Trig functions: – Sin/Cos/Tan. - Inverse Sin/Cos/Tan. - Hyperbolic.Constants – PI (3.14…) and e (2.718…)Powers/Logarithms- Natural log , e to power, 10 to power, Square root.Parenthesis- Count of left/right on button.Friendly error reporting.Use degrees or Radians.Delete items or entire input line.Last value or any previous formula can be recalled.Recallable history line.Works in all orientations.Number of output digits can be set (3 to 17 places).BUTTONSLarge – easy to read and press.Color coded by topic- - Numeric input. - Trig functions. - Editing (clear line, delete last, recall last value). - Operators (+, -, /, *, ^, parenthesis). - Other functions.HISTORY LINES-Scrollable history region above input line.-Each line displays input formula + calculated answer.-Any line may be deleted.-If formula is started then selecting a line inserts the value.-Selecting a line with empty formula brings down the entire formula.