cheat app

https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
You should report them if you haven't. https://support.chess.com/article/209-how-do-i-report-someone
That said, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums.
If you would like to discuss, join the following club: https://www.chess.com/club/cheating-forum