Which card should you swipe?

Pick your cards once. We'll tell you the best one for every purchase — and track the credits you haven't used.

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No account needed. Your picks save on this phone automatically.
Add a household code anytime to sync with a partner.
WhichCard
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Ranking accounts for parked categories, quarterly picks & activations, published rotating calendars, caps you've logged against, network floors, and your point values. Tap any card for the why.

Benefits

$0
in unused credits
0
expire within 31 days

My Cards

Search the built-in card database. Tap to select, tap again to remove — use ＋ copies when you hold the same card twice.
Card facts come from data/cards.json (14 fully modelled cards) and the wider data/cardLibrary.json, verified 2026‑07‑30 against issuer pages. Library cards marked unverified need a second look before you trust their rate. Spot something wrong? The data files are the source of truth — fix them there.