Swiping the wrong credit card could mean missing out on valuable rewards, points, or cash back.
Wallaby makes sure that doesn't happen to you by telling you which card in your wallet is the best one to use, for any location you're shopping or dining at.
And... Here's another one:
There is still stuff that you would lose, for instance like Black card prestige, or room upgrades by showing certain cards , or elligible flight upgrades discounts etc.
Am I reading it right that this app doesn't have a Windows Phone version?