I built a tool to solve the "which cashback card do I use here?" problem. Would this be useful to you?

I hold four cashback cards and I still get it wrong at the checkout. Different caps, different merchant categories, different reset dates. By the time I've thought it through, I've either held up the queue or just tapped whatever card was on top.

I'm building CashBack Caddy, a Singapore app that tells you which card to tap at the moment of payment, based on your current caps and promos. No manual tracking, no spreadsheets.

Two questions for the community:

1. How do you currently decide which card to use at checkout?
2. Would an app like this actually change your behaviour, or do you think you'd just go back to muscle memory?

Waitlist is open if you want to follow along: www.cashbackcaddy.com