Steward Rewards

Steward tells you the best card to use at checkout. Walk in. Tap the lock screen widget. You get one card from your wallet and the reason it won. Steward hands you off to Apple Wallet to pay. Add the cards you carry. Steward runs on public information about cards and rewards programs, so you can use it without linking an account. Set your priority to highest dollar value, cash back, or points in specific programs, and every pick ranks for that.