Type an expression and press Enter (or the play button) to evaluate it and save it to the history. As you type you will see a live preview of the result.

Press the Functions button to insert operations at the cursor: powers (2 ^ 3), roots (sqrt(16)), trigonometry (sin(30 deg)), logarithms (log2(64)) and statistics (mean([1,2,3])).

If the expression has a variable (e.g. x), the Plot (draws y = f(x)), Differentiate and Simplify buttons appear.