You're leaving 8–15% on the table. Every purchase.
Perkstacker's AI tells you the exact credit card + cashback app + loyalty combo to use — before you pay.
YOU ASK:
"$52 fill-up at Shell"
AI ANSWERS:
1Shell Fuel Rewards — check in for 5¢/gal member discount
2Upside app — claim the offer first: 18¢/gal cash back
3Citi Custom Cash — pay with it: 5% back on gas
Total saved: $6.05 (11.6%) ✓
Download Perkstacker — free
Available now on iPhone & Android. Get your first AI-powered stacking plan in 60 seconds.
Want the Stacking Cheat Sheet by email too? Drop your address:
Built for gas · groceries · dining · travel — plus a GPS mileage tracker for 1099 drivers (72.5¢/mile in 2026)
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AI Stack PlannerTell it what you're buying — get the optimal card + app + loyalty combo in seconds.
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40+ cards, 60+ brands understoodAmex, Chase, Citi, Capital One — we know every reward structure so you don't have to.
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No card numbers, everWe only store which cards you carry — never numbers, CVVs, or expiration dates.