Mathify is an ongoing project aimed to be full math editor and CAS (Computer Algebra System). Currently it is useful for creating formulas, copy LaTeX into clipboard, sharing as .jpg or .png images and also calculate results in WolframAlpha.
-For greek symbols include greek in your native keyboard.
-To select formula longpress on a formula or text.
-To activate zoom using pinch gestures tap with two fingers then start to zoom. To deactivate zoom mode tap with single finger.
-For power or index (superscript, subscript) use '_' (underscore) for sub and '^' for super scripts.
For Big Operators (integrals, sum, product ....) choose type of limits and to add limits press '_' (underscore) for lower limit and '^' for upper limit.