CardSignals

CardSignals tells you which of your own credit cards earns the most on the site you're on, using the cards already in your CardSignals wallet. • The best card for this site in one click: open the popup on any site to see every card you hold, best first. • A small panel on 225 curated shopping, grocery, dining, travel and streaming sites shows the answer right on the page. Minimize it, or hide it on any site with "Never here". It appears nowhere else. • Your whole wallet: Canadian and US cards. Switch between Both, Canadian or US in the popup. • Add all your American Express Canada offers in one go, on your own Amex offers page, while you watch. It never acts in a background tab. • Works offline after first use: answers come from your saved wallet. • Free to use with a CardSignals account (the same account as the CardSignals app). Pro adds unlimited cards. CardSignals is not a card comparison site and shows no ads. On shopping sites it reads nothing from the page: the panel only shows an answer worked out from your own card list. On your American Express offers page, and only when you ask it to add your offers, it reads the offer list so it can press the add buttons for you. Nothing from that page leaves your browser.