errors in scoring using MCR
Major fault on iPad: not able to select a discard from right end of own tiles.
Minor pro: aware of MCR (international tournament rules), tiles are readable.
Major con: many mistakes in scoring (e.g., flowers counted toward minimum of 8 points for HU, hidden kong scored as if melded, scored Single Wait when Melded Hand was appropriate).
I recommend Standard Competitive Mahjong as a much better app for learning and playing with MCR. (It has a Lite/free version.)
MathPoly about
Mahjong Time Lite, v1.6