The ranges were built using the advanced poker simulation programs PioSolver, Monker Solver, Holdem Resources Calculator, and Poker Snowie. These ranges are guaranteed to help you go deeper and win more money. No internet connection needed to use the app. All ranges are stored on phone so once you download the app you are good to go. The Preflop Advantage contains easy to navigate and read, color-coded charts which makes it the perfect companion to live play whether you are playing in a live event or playing online. Check your ranges instantly and see if you made the right decision. To report a bug, offer feedback, or get in touch with us please visit - https://pokermasterminds.com/app-contact Our terms and conditions can be found here - https://pokermasterminds.com/preflop-advantage-terms-conditions Our privacy policy can be found here - https://pokermasterminds.com/privacy-policy