Butter — Smart Card Recommender

Detects checkout pages and shows which of your Canadian credit cards earns the most on that purchase. Nothing leaves your browser.

You're probably using the wrong card. Butter is a free extension for Canadians that answers one question at every online checkout: which of MY cards earns the most on THIS purchase? HOW IT WORKS • Tell Butter which cards you carry — by name only, never numbers. • Shop normally. When Butter detects a checkout page, a small widget appears. • It reads the order total locally and ranks your cards by real earn rates: category bonuses, caps, foreign-transaction fees, point values. PRIVATE BY DESIGN Everything happens inside your browser. Butter makes zero network requests — no page content, no purchase history, no card numbers ever leave your machine. Your wallet is just a list of card names in Chrome's own synced storage. HONEST BY DESIGN Butter's recommendations are commission-blind: the ranking engine has no access to affiliate data. The best card for you wins, every time — verified earn rates across 79 Canadian credit cards, maintained against issuer sources. ALSO FROM BUTTER Upload a bank statement at buttercard.ca to find the single best card for your real yearly spending.