I have a decent number of credit cards, but most of them are cards that I opened and just used to hit the minimum spend, claim my signup bonus, and then go back to using my regular credit card that has the best day to day rewards (I also only open cards that waive my annual fee, and cancel any that try to make me pay to keep it open. Keeping them open for free is good for my credit utilization and age). Sometimes, however, a specific card will offer 5x (or something similar) on certain categories for a limited time. If I could give Wallaby detailed information about how I value rewards, it would be nice to just have one card that I carry around.

I pay all my credit cards off monthly, and basically treat them as cash (so I'm not the target consumer of a rewards card, I know).