"Open Up Preflop" is an amazingly simple app that gives you a quick reference guide for opening with a given hand before the flop in No Limit Texas Hold'em. You simply enter the position and the number of players. Once you have that info, you can decide to see the hand range for a "Tight" player or an "Aggressive" player. If you are new to the game of Texas Hold'em you can use the app to get a basic understanding of when to open a pot with a bet. If you are a more advance player, you can use this chart to help see a hand range a player might be playing.