Blackjack Card Counter and Strategy Guide gives you the edge against the house, allowing you to count the cards remaining in the shoe.  Supports 1-20 decks in shoe. Supports minimum  bets of 1-100.
Disclaimer:
This application is meant to be used for informational purposes only, and when gambling you always have a chance of losing.  Google Play, Google, and the app creator hold no liability for loss of funds caused directly or indirectly by using this app.
Play responsibly https://www.begambleaware.org/