Chess engine app?

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Jonboy1042
Is there an iPhone app where I can use a chess like the ones used on Saint Louis Chess Club when they are doing live analysis of events? Ideally it would be able to tell me which side is winning in each position throughout the game.
If someone could just tell me which one is the best for game analysis I would appreciate it
CheckmateGenius
Stockfish has a IOS app I think. Atleast it saif so on their website