Deck answers one question: which of my cards should I pay with? Type a purchase ("RM120 dinner at Din Tai Fung"), and Deck ranks your own cards by the actual reward each would earn — using the banks' published terms, your reward caps, and your spending tiers.
Common questions
Why doesn't Deck ask for my card number? It never needs one and has no field for one. You add card products (e.g. "UOB ONE"), not card numbers.
Why did Deck recommend a different card than I expected? Tap the recommendation to see the math: rates, caps already used, and tier thresholds. Weekend rates, spend tiers and monthly caps change the answer honestly.
How do I fix my spend/caps? My Deck → tap a card → tap the qualifying spend amount to set your real statement spend.
How do I delete my account? Profile → Delete account. Permanent and immediate; also revokes Sign in with Apple tokens.
Forgot your password? Sign-in screen → "Forgot password?" — a 6-digit code is emailed to you.