StackWise

Users juggling multiple cards face a quiet, constant decision problem: which card actually earns the most on this purchase, right now, at this merchant? Promo codes, cashback categories, and miles rates all interact differently depending on where you're spending, and working that out by hand at checkout just doesn't happen in practice. StackWise is an agent that does that reasoning for users — checking promo codes, card rules, and miles rates for a given purchase, then showing a step-by-step trace of the comparison before recommending which card to use and why.