ChessFree (iPhone App) vs. Chess.com's Computer @ Level 10

So I recently downloaded an app called simply "Chess Free"... I always find random apps and chess games online that I play against  eachother for fun, and I've noticed that this app is actually pretty good. I played it's moves for it against Chess.com and I played Chess.com's moves for it on the app. The app was at full strength and had the white pieces.. I've seen other apps play decent against Chess.com (high 90%'s) but they still have always lost. I expected this app to be similar, maybe a better accuracy score.. but to my surprise it played 99% accuracy and was able to play the game into  draw... it was the first time I've seen an app/random browser site engine not lose to full strength Chess.com. The game is pretty good (link below) , and I just thought this was very interesting.. has anyone else seen this happen before,,, just a regular run of the mill, AppStore chess app, play this well against Chess.com?? I've heard that their engine is a version of Stockfish??? let me know... thanks fellas. Heres the game 

https://www.chess.com/a/PHqRQLGnT694