CardStack
CardStack+

Best card on every site.

Shop Nike, Peloton, Chase Travel — the extension shows the best card and one-click offer activation. Install once. Earn everywhere.

Part of CardStack+ — start with a free trial.

Add Amex and Chase offers automatically — never miss a deal

  • ✓ Every time you visit Amex and Chase, we'll automatically find and add your latest offers and sync them with your CardStack account.
  • ✓ Best card overlay on supported sites — see which card to use before checkout
  • ✓ Automatic offer detection — we find Amex and Chase offers for the merchant
  • ✓ One-click bulk enrollment — add 100+ offers to your card instantly
  • ✓ View saved offers in the CardStack app — no bank login in the extension

The extension runs in your browser. We never see your bank password.

Get the CardStack extension

Safari Chrome

FAQ

How do I enable the CardStack extension in Chrome? ↓
  • Install CardStack from the Chrome Web Store and pin it to your toolbar.
  • When Chrome asks, allow website access—this powers the best card widget, shopping recommendations, and Amex and Chase offer pages after you log in.
  • Open the CardStack extension and tap Get pairing code, then enter that 6-digit code in the CardStack app (Settings → Browser Extension) to link.
How do I enable the CardStack extension on iPhone (iOS)? ↓
  • Install the CardStack app from the App Store if you haven’t already—the Safari extension is included.
  • Open Settings → Safari → Extensions, turn on CardStack, and set Website Access to Allow on All Websites.
  • In Safari, open the CardStack extension and tap Get pairing code, then enter that 6-digit code in the CardStack app to link.
How do I link the extension to my CardStack account? ↓
  • In the CardStack app, go to the Browser Extension (or Link Extension) screen.
  • In the extension, tap Get pairing code.
  • Enter the 6-digit code in the app to link.
  • You need a CardStack+ subscription to use the extension.
Why does the extension need website access? ↓
  • The floating best card and offer widget and shopping recommendations.
  • CardStack to run on Amex and Chase pages after you log in.
  • We never see your bank password.