Grammar lessons should not have grammatical errors – Grammar App by Tap To Learn Review

I am concerned that the dev has no idea what he is talking about because of all the blatant grammatical errors. If I was good with grammar I would not be using this program, yet even I can point out an error on every other page. I would put money down that this was made by a non native speaker that made this program in one afternoon. The dev needs grammar lessons of his own. I want my money back.
Review by Just plain awful on Grammar App by Tap To Learn.