The application appears to be called Blackjack Card Counter, developed by Webtopia, an Australian company.
Card counting itself is not illegal under Nevada gambling laws, but it is considered a felony to use devices to help count cards.
The Nevada Gaming Control Board sent a memo to casinos last week warning them of the program.
In Southern California, atleast one casino is aware of the program.
In blackjack, certain card counting techniques help players determine when they are likely to win a hand and adjust their bets accordingly.
Nevada learned of the program from gambling regulators in California, where officials at an Indian casino found customers using it and tipped state authorities.
Local news from across Southern California
So far, there have been no reported uses of the application in Nevada, and casino officials warn that anyone caught using it could be arrested by Nevada gaming agents.